Some of you may have seen the Yamaha XT250 i picked up the other day. It has a kickstart issue, the kick lever is stuck, so i'm guessing it might be a problem with the kickstart gear, shaft or spring, or possibly a problem with the auto decomp. It need's a few thing's done, new tyre's, chain and rear sprocket, horn fixed, and need's the muffler to be repacked or replaced. And an overall tidy up. Best thing is it came with 2 month's rego on it still. Here it is as i picked it up
The XT was an ex farm bike, so it has done reasonably low k's, only 26,000km's I had a couple of good Bridgestone DOT tyre's sitting in my shed, so yesterday i swapped the rear tyre on and cleaned up the surface rust on the swingarm etc Rear brake shoe's have already been replaced, and i painted up the brake backing plate with some satin black at the same time Also painted the chain adjuster's and rear wheel spacer's I gave the seat cover a clean up with some thinner's to get the built up grime off for the time being. I have ordered a new oem style red cover from Taiwan which should arrive in a couple of week's. The engine is pretty clean so i repainted the cylinder etc with so\me satin black engine enamel to tidy it up And i made up a new red sticker for above the headlight and fitted that. I gave the r/h air scoop a good scrub back with hand cleaner then polished it up a bit with Fibreglass polish/wax, that came up a lot better, got rid of most of the chalky white colour
Next thing to do is get it running. I pulled the clutch cover off, took out the kickstart shaft and gear etc, it's all good. Next i took the clutch out basket and all, the gear on the back of that is good too. Thought i'd try turning the crank over and might have found the issue, it's making a grinding noise from the cylinder/head ? Hmmm, might be a top end rebuild ? Don't think the seller has told me the full story..... If it need's a piston etc i might think about a big bore kit
I've just tried turning it over again and i think i know what's wrong, i've heard that noise before !! finger's crossed
Well i thought the noise might be the flywheel rubbing on the stator. Took the stator cover off and yep it is, so either a dodgy flywheel key or dodgy crank bearing's Just need to find my Flywheel puller now to take it off and check it out further
Spotted this on gumtree and thought to myself that this will not last long. I then came on here and saw that you had picked it up. Great pick up if it's an easy fix
Thank's, it is in pretty good condition for a farm bike I took the flywheel off this morning and have found the crank is out of alignment. So now need to decide what to do, whether to pull the engine out and split the case's to have the crank aligned again or to buy another complete engine and fit that. This is the flywheel and stator showing where it was rubbing Luckily there is no damage to the winding's, i should be able to sand back the inner of the magnet and get that smooth again where it's rubbed, it's not too bad Also the old owner told me he pulled the carby's off and cleaned them but it wouldn't start after that. I looked at the 2x intake manifold's and noticed that the rubber part is only connected to the alloy manifold inner's at the top Pushed the carby up and this is what i saw I might be able to temporarily urethane them back together again, otherwise i have some Nos Suzuki intake manifold's that may fit And what the new one's look like
Basically the same engine as the SRX250 apart from the Electric Start vs Kick Start. I took the rubber elements from the inlets and cleaned them all up and the alloy and then used Sikaflex to put them back together... I havent run the engine yet but they seem to have taken nicely. Next step will be to have manifolds machined and use Silicon hose in place of the rubber... Looks to be a nice little bike... will watch this one closely.
Yeah they're related to the SRX, SR and TT engines I wouldn't go with silicon hose, it swell's with petrol and won't last too long @maelstrom was making some intake pipe's to adapt a flange manifold to the carby
There is a fuel rated Silicon available and has been used on similar bike or go for a suitably sized fuel resistant rubber of the correct size. The trick is getting the manifold ID and OD to match hose sizes and blend into the head for smooth flow. Sent from my iPhone using Tapatalk Pro
Swapped the old worn out King's tyre for my one of my spare's today, i've got a decent Bridgestone Gritty on it now, and cleaned up the rim and fork boot's while i was at it It's starting to look like a decent bike now, it is slowly losing all its' farm patina
Very nice, all you need now is a TT350 barrel, piston, clutch cover, oil line and head plus some machining on the crankcase and you will have a very pokey little 350 Sent from my iPhone using Tapatalk Pro
Engine came out reasonably easy, just 1 bolt that was a pain in the butt, the right inner header bolt needed to come out with vise grip's at 16th turn at a time All the wiring look's unmodified and pretty clean
Head and cylinder came off the old engine today Cleaned the head up in my blasting cabinet (all opening's sealed off), then degreased and cleaned and cleaned and cleaned Also match ported the intake's to the head, not sure why but the left intake is 25mm, the right is 27mm ? The left side manifold was 4mm smaller than the head port, the right manifold was between 1mm smaller and 3mm smaller, i smoothed them out with the dremel and carbide burr, then finished with a course grinding stone. I checked the valve clearance's and i only need to find 1 smaller/thinner shim, i need a 25mm o/d 236 to 242 (2.36mm to 2.42mm)