I picked this up for the little guy, looks to be in good shape. The clutch bites late so it might need new plates and it has a DEP exhaust that makes the power band a bit too vicious for him to learn clutch and gears with so I’ll try to pick up a stock exhaust. Tried installing the flywheel weight tonight but it fouls the cover. The chain was extremely loose and despite what I thought, there was enough adjustment left to get it in spec, I also need to install the new fork seals that came with it.
Bit of a big step up from the PW80 but I think he’ll be ripping this around in no time.
Install fork seals
Change gearbox oil
Find stock exhaust
Tried to install flywheel weight – no go
Replaced screw in kickstart with hex bolt, missing bolt from flywheel cover, missing bolt from rear brake guard
Josh was looking for a car but when I saw this going for a good price, my family convinced me to jump on it and give Josh the Golf GTI. It has 250,000 Kms but the seller rust proofed the underside for me and it came with new brakes all round and all season tires.
When I punched it to overtake someone the other day, I started getting some hesitation and then the CEL started flashing indicating that there had been some misfires. I pulled the pending code that indicated the misfire was on cylinder 4 only so I figured the first place to start was spark plugs. CarQuest was able to get me some at a very reasonable price so I ordered 4 and installed them, also swapped coils on cylinders 1 and 4 just in case. The plug in cylinder 4 was the worst and was well worn, wouldn’t be surprised if it was original!
Straight pipe resonator?
Get rims for winter tires
New spark plugs – NGK 91215 DILKAR7C9H
Check exhaust for leaks – small hole in resonator, cat flange rusted
Just picked this up (Jan 2019), really wasn’t sure about getting another 4 stroke but couldn’t find a nice 2 stroke and got a great deal on this.
RM-Z 250 parts list and exploded diagrams Jan 2019 Race sag = 95mm, static sag = 41mm, preload length 255mm All damper settings set to stock Valve clearances: Exhaust 0.17 – 0.24mm (0.007 – 0.009″) Actuals Jan 2019: L 0.178mm, R 0.178mm Intake 0.09 – 0.16mm (0.0035 – 0.006″) Actuals Jan 2019: L 0.152mm, R 0.127mm
To Do List
Install new fork protector rings
Front brake rotor and pads
New fuel pump – wiring?
New rear brake rotor and pads
New rear tire – Metzeler MC5 Intermediate
New rear wheel bearings and tire clamp
New U linkage – picked up a used set from a 2009 RM-Z 250 but is different part number, looks very similar, will take measurements some time
Straightened rear rotor and tried to re-seat rear tire. Rotor is badly worn, new one required. Even at 80 psi with washing up liquid, could not get the tire to seat properly, then noticed large cracks in some of the knobbies on the edges = new tire, ugh.
Oil and filter change
Oiled and installed new air filter
Repaired tear in seat cover
Soldered wires back on to fuel pump
Replaced all linkage bearings
Check valve clearances
Replace upper rear shock bearing
Install new grips
Set all damper settings to stock
Set race sag = 95mm, static sag = 41mm
Stitched rear mudguard with zip ties
Repaired muffler mount
Re-seated front wheel
Replaced handlebars with slightly cut Renthals (stock?)
Saw this on Kijiji and thought it would be good for us all to play with and even for the wife to use as a pit bike at the MX track. Sadly when I got it home I found that most of the stuff I was told about it was not accurate …
“Brand new rear rim and hub assembly” – really, with dirt all over the hub and sprocket, a bent spoke with broken nipple and a dent in the rim???
“Upgraded battery pack” – looks like 4 x 10Ah SLA batteries to me, same as stock, what’s upgraded about it?
“It’s only been ridden about half a dozen times” – it’s 5 years old! And I suppose that in those 12 hours (charge lasts about 2 hours) the rear tire was worn down, and a lot of the stickers fell off???
Also, the rebound adjuster on both the forks AND shock was damaged so they wouldn’t turn, the rear end has been smashed so hard that the mount screw for the rear shock was bent and the bushing trashed, the steel bead in the rear tire was all bent, the front mudguard was snapped in half, there was no air pressure in the forks and the battery cover was under the battery.
Oh well, this all just shows that I should perhaps not be so trusting and do a better job of inspecting stuff before I buy.
Set to work on it. No room in the garage, sat it in the trailer,
After the MaxTakeoff treatment,
The torque on this thing is insane, but being a trials bike, it’s not very fast. You need to be super careful with the throttle response setting and it takes a bit of getting used to especially when riding slowly. It’s really designed for kids 9-12 years old but it is well made with decent components and easily copes with my 5’9″ and 160lbs. I was sold on it after watching this video,
We’re planning on frequent visits to the track this year and I wanted to be able to transport all 4 dirt bikes and keep all the riding gear out of the rain. We rented an open trailer from U-Haul last summer when we went camping but it was only 5’x8′ so could only really fit 3 bikes. I was looking at bigger open trailers but I soon found that I would have to increase my budget or buy brand new from Canadian Tire where I could get interest free equal payments on their credit card. As usual, the budget crept up until I found this 6’x10′ enclosed trailer.
It has some issues but seems to be pretty solid and once I’ve cleared out the shelving, I think we should be able to get 4 bikes in.
To Do List
Attach roof rack half to the A arms at the front
Make container smaller ready for bigger bikes
Install rack at rear to hold bikes instead of door frame
Paint frame again
Swap tires onto new wheels
Find a way to secure the container to the floor – screwed blocks to the floor
Replace side marker lights
Remove sticker residue from back and sides – scraped off with Goo Gone and elbow grease!
Paint new wheels
Find a spare wheel, 205 75 R15 – Picked up 2 for $25 off Kijiji, cleaned up nice
Paint frame underneath and welded door supports – 60% complete
Bought new ratchet tie-downs for front bikes
Make some ramps – made one that locates on bottom door lock
Tidy up wheels – wire brushed and painted
Install new PS tail marker light
Tighten and grease wheel bearings, replace caps
Offer up all 4 dirt bikes
Repair side marker light and install new bulb in left tail light
Install tie-down anchors at front
Install shelf at front
Repair rear door supports – both had come away from the frame at the bottom, found that the screws are 8 point Robertson, removed frame, peeled back the panel and welded some metal brackets on 2 sides to re-attach supports to the frame
Purchase magnetic light
Register trailer and install plate
Obtain more tie-down anchors – 8 for $25 off Kijiji
Fix interior panel at rear
Remove all shelving
Fix wiring for lights – bad joints at the connector
Pick up 2 x padlocks for hitch and door
Sure enough there’s a good bit of room even with all the bikes loaded.
So I made a box to put the toolbox and gas cans in.
YZ250Fw parts list and exploded diagrams Valve clearances: Exhaust 0.17 – 0.22mm (0.0067 – 0.0087″) Actuals Dec2017: L 0.203mm, R 0.178mm Actuals Jun2018: L 0.203mm, R 0.178+mm Actuals Dec2018: L 0.178mm, R 0.178mm Shims: L 1.72mm, R 1.75mm New Shims: L 1.70mm, R 1.73mm Actuals Jan2019: L 0.203mm, R 0.178+mm
Intake 0.10 – 0.15mm (0.0039 – 0.0059″) Actuals Dec2017: L 0.102mm, M 0.102mm, R 0.127mm Actuals Jun2018: L 0.127mm, M 0.127mm, R 0.127mm Actuals Dec2018: L 0.102mm, M 0.127mm, R 0.127mm Shims: L 1.76mm, M 1.73mm, R 1.72mm New Shims: L 1.72mm, M 1.72mm, R 1.70mm Actuals Jan2019: L 0.152mm, M 0.127mm, R 0.152
Aug 18: Backed off pilot air screw ~1/4 turn to address hanging idle and tough warm starts (although we weren’t following the procedure in the manual)
To Do List
Replace upper rear shock bearing – got a set of bearings but there isn’t much play at all, probably install them next winter
New front brake lever
Oil and filter change – AMSOIL synthetic
Re-fill with coolant
Install new head gasket
Check piston and con rod, visually inspect crank – looks good
After losing confidence in the YZ250F reliability due to the valve failure, I listed it on Kijiji for trade for a 2 stroke. I was offered a 2004 KTM 125sx that was ‘ready to ride’ and when I checked the reviews, this was the year that they sorted out the poor rear suspension. So I met the guy and my heart sank when I saw the condition of the bike and the huge dent in the expansion chamber but it started ok and sounded alright and for some reason, I went through with the trade. When I ran the VIN, I found out that it is actually a 2003, great but at least the VIN was not reported stolen.
When I got it home and started looking closer I found all sorts of little issues, front fender wobbling, play in front wheel bearings and rear shock lower bearing, bent rear sub frame, fork seals leaking, it looks like this poor thing has just been neglected – I would not class this as ready to ride. It amazes me how people will sell something without even washing it??? Pretty disappointed with the accuracy of the description but I could have walked away and the issues really are relatively minor … so far. So I got started on fixing it up, here’s a more recent pic,
125sx parts list and exploded diagrams
Race sags: Josh/Jake = 95mm, Stu = 114mm, static sag = 44mm
Jet needle set to middle notch
24 Aug 2018
Compression damping on rear shock = stock + 2 clicks
Compression damping on forks = stock – 6 clicks
Jet needle lowered to 2nd notch from top to address mid throttle sputter – we’ll see??
Race sag (Stu) = 105mm, static sag = 30mm
To Do List
Give it a good wash
Fix wobble in front mudguard – Front brake cable clamp is missing that provided a spacer, put large washers in for now; new brake cable clamp installed
Fix huge cracks in rear mudguard – Used the old tie wrap stitching trick
Remove seat cover – original cover still underneath with only minor tears
Bend radiator mount tabs back, prevent them from fouling the forks
Threads damaged on oil level check screw – replaced with radiator mount screw since replacement screw had larger (10mm) head
Replace worn vent screw in fork cap – not needed, with good screwdriver not much effort is required to undo
Check rear brake cylinder, push rod comes out? – looks like it could be normal on parts diagram but the rod is well corroded
Replace front wheel bearings
Replace rear shock lower mount bearing – replaced with MSR bearing, not teflon
Fix seized rebound adjust screw on rear shock – got a 2007 XC-W shock PN 12178C04 mono compression control
Fix spring on kick-start shaft – ratchet gear was mis-aligned on shaft – rectified
Replace fork seals – refilled with AMSOIL SAE 5 synthetic
Thread in left side fork protector mount hole damaged – one or two threads seem ok, new screw held in with thread lock
Install new piston – plenty of blow-by on piston skirt, got Wossner piston and ring (awesome!) and new small end bearing
Cylinder stud broken, the nut and top of stud were glued in place!!! WTF?!?! – got the old one out with stud remover, installed new
Screw and bucket holding the rubber chain guard on the swing arm missing – threads in hole on swing arm trashed, aluminum is thin on swing arm not much there to hold heli-coil, tried tapping to M6 and thread locking, not overly happy with it though
Ball bearing for kick start – thanks Dan and TSR
New right side drain plug M10x1 – threads in clutch cover are trashed! There is a bit of the old threads left but the drain bolt slips straight in, tried installing an M10x1.5 Fix-A-Thred insert in the remaining threads but the hole was too small. Plugged with high heat JB Weld
Fix broken arm on sub frame – Josh welded it up in auto class. Update: the weld failed so a small steel bar was fashioned and inserted. Thought about filling around the bar with JB Weld or drilling holes and holding in place with screws but the bar was a tight fit and there should not be any load trying to pull it out the back of the bike so I think it’s good now
Spring for rear brake lever is missing – bought new one
Clutch basket and inner hub are both damaged – replaced with used parts found on ebay
Clutch holding tool required – used impact driver
Replace spark plug – ordered from Fortnine
Install new clutch actuator gasket, screw and banjo washer – screw was too long?? had to cut one down
Get mineral oil for clutch, top up and bleed clutch actuator – also bled the front brake again
Little play in rear wheel – replace bearings, ordered from Fortnine with grips
Installed new grips
Set race sag and suspension settings to stock – race sag = 105mm, static sag = 30mm, compression damping on rear shock = stock + 1 click
Clean rear rim
Install new Shinko rear that came with the bike
Adjust chain tension
Loctite the handlebar perch mount screws
New front tire – picked up a very lightly used Dunlop Geomax
Split engine and remove crank (big end bearing seized)
Install new Hot Rods crank and new bearings
Check power valve z dimension
Teach the lad how to short shift
Properly repaired the rear subframe using a strip of steel drillled and tapped to take 4 M6 machine screws and replaced all the broken zip ties
My older kids at 13 and 16 didn’t have experience of riding motorbikes with gears and the RM125 was way too intimidating for them to learn on so I wanted to find something a bit more manageable. The 80cc bikes seemed a bit small so when I saw this KX100 listed for a reasonable price, I jumped on it. It has been trail ridden by the previous owners and has a flywheel weight that helps keep it from stalling at low revs – perfect for newer riders.
The little guy was way too big for the PW50 so started looking for an upgrade. I found a couple of 4 stroke TTR90s but didn’t get any replies and once the little guy got wind of a potential bike change, he put the pressure on! I found this PW80 fairly close by and it was listed as having ownership and manuals but was in pretty rough shape compared to some others that were a similar price. We went to see it the day before we went on vacation and as it turned out the guy didn’t have ownership, only some registration paper from the previous owner and no manual??? I should have left it but the guy was firm on his price and my lad was very keen on it (what a surprise) so we paid the money and brought it home.
Here’s what it looked like after a bit of cleaning up.
After only a couple of outings to RJs Motorsports track in Midhurst near Barrie on the old RM125, I was hooked again. On the second outing I had tuned the suspension and was doing much better but it felt very sensitive to throttle input, like the power band was very narrow. After riding my kid’s KX100 that had a much smoother power delivery, I started playing with the power-valve setting, however, since the kids now had a bike to ride and I was keen on riding more often, I decided it would be a good idea to get something a bit newer. Started looking on Kijiji for a newer 125 but people seemed to want a lot of money for them. I really didn’t want a 4 stroke but most of the bikes at the track were YZ250Fs and I found 3 for sale under $2500 on Kijiji. My research only turned up glowing reviews of the YZ250F and some people were suggesting they were better than 2 stroke 125s in virtually every way.
Decided to go for it and picked up this 2001, a couple of minor issues but pulls nice and strong and seems to be in good condition.
Can be hard to hot start – lowered the idle and then had a tough hot start, opened up pilot fuel screw about 1/16 turn. I read that these bikes are supposed to idle at around 1800 rpm because with a low idle the cam chain not consistently loaded making them run very rough – new plan, raise the idle back up. Had a bit of a wandering idle and backfire on shutdown, closed pilot screw 1/8 turn so now is 1/16 turn in from original setting
Left side radiator guard is missing
Repair bolt in upper fork yoke, winter?
Replace main bearings
Repair exhaust stud in cylinder head – investigate thread inserts to repair stud in cylinder head, I assumed there were supposed to be two exhaust studs but checking the parts list and exploded diagram there is only one – check threads in the exhaust bolt hole – got new 2003 head
Install new head, valves, cams, cam chain, piston and rings
Tiny bit of play in swing arm – replaced linkage bearings, still some play – traced to a clearance between lower rear shock bolt and ID of bearing inner race, shimmed with coke can. Similar issue with a clearance between the bolt that connects the linkage to the swing arm and the collars, put old collars back in. Are these linkage bearing kits not made to tight tolerances???New (used) rear brake lever – made new clevis to replace bolt
Replaced bolt in upper fork yoke with longer bolt with nut on the end because threads are trashed (not by me!)
Install new front wheel bearings
Install new lower shock bearing
Kick start lever (aluminum) worn – welded blob on steel hub
New muffler bracket – made one from exhaust hanger band and tool drawer liner
Repack muffler with FMF standard packing
Repair huge dent in muffler
New shouldered bolt for front brake lever
New rear brake fluid reservoir
Check valve clearances
New handlebars (from RMX250) – a touch wide so cut 1/2″ off each end
Add spacer to spring in kick start lock so it doesn’t vibrate out while riding