9 posts in this topic
Have a 2015 YZ125. After a rather bad crash I had to replace the subframe and air box. I put it all back together. Kicked for 5 minutes Wouldn't even come close to starting. Had been sitting for 6 weeks or so, so I checked and Got spark, got compression, got new plug(old one showed proper color, not lean), got gas supply to carb. Anyway I lay the bike on its left side for a highly technical excess fuel purge and first kick with fuel off and zero throttle, it starts but have runaway engine condition. Had to use kill switch to stop it before it blew up. I have been reading that it could be crank seals or another type of air leak. Not really buying that because why would it start right up after simply laying it on its side. New air box should be sound and sealed. Anyway I would think the air leak if it's that is after the carburetor. On the YZ there is only the reed valve after the carb. I'm thinking crud in the carb but on a dirt bike you would think that would be a more common condition. Anyway, looking for ideas here.
By Mason Mayhall
Whats up everyone I'm pretty new to the forum so I'm not sure if I'm posting in the correct spot.Either way I need some help! what year kickstart levers will fit my 2007 yz450f. I got away with a Kim lever off a 525 exc but now I'm looking online and can't find much but one option for 130$ I'm seeing a lot of options for 2011 levers around 75$ and they look nicer with a blue instead of silver. Does anyone know what size the spline is? what other years I could possibly use? thanks in advance. On another note my oil filter housing bolt is stripped like most I see are dealing with. I have googled away and cannot seem to find where to order that bolt.
names of people who rebuild engines, heads, etc through the mail please. I have taken the advice of several people here on Thumpertalk and fired my mechanic. This is a small town and my old mechanic is buddy buddy with all of the others so when i need to get my head or complete engine rebuilt i will have to send it to soneone. Thanks
I bought a 2001 xr200r bike as a project and am in the process of rebuilding it. I have never rebuilt a bike before, only automotive engines and was intrigued by the versatility and challenge of doing something I've never done before, plus who doesn't want a dirt bike?
I have been told that I can bore out the cylinder in order to accommodate an xr250r piston. I have done research on the differences between the two motors through schematics and specifications, but I still have some questions and concerns.
1. Is an xr250r top end compatible with an xr200r bottom end?
2. Is rejetting the xr200r carb enough or should I upgrade to a xr250r carb and fuel tank?
3. Can it remain a two valve system or would I rebuild the whole top end with a xr250r 4 valve?
4. Dry sump vs. wet sump?
5. Is it worth the power difference?
6. Higher performance bearings in the bottom end to handle the power difference?
7. Available kits or call a machine shop?
Like I said, this is the first time I have ever done this so inexperienced is a kind way of saying I'm pretty in the dark here, but looking to learn and build a beautiful machine for next season. Any input is greatly appreciated! Thanks!