[sven707]

I bought a used 07 CRF250R that wont start. I can start it by pulling it behind a quad and it will start when the engine gets around 4000-5000 RPM. If I try to let the bike idle down, it just dies and wont kickstart. Even if I adjust the idle way up so that it will stay running, it wont kickstart after I shut it off. I don't really know where to start eliminating possible causes. I am pretty sure they don't allow quads and tow straps on the starting line, so any help would be greatly appreciated.

[Asmith]

Check pilot jet.

Check valves.

[sven707]

I'll check the pilot, and do you mean valve clearences or should I also look for something else. To look at the bike, it only appears to have been ridden 2-3 times (no wear on engine cases or frame, original tires and grips) so I was kind of hoping it wouldn't be anything major. It will be a good learning experience for me. Thanks.

[Asmith]

Yes. Valve clearances.

One of the symptoms of a closed intake valve is hard starting. Only able to be bump started.

[sven707]

I'll post again after I check them, thanks again.

[Asmith]

I'll post again after I check them, thanks again.

http://crfsonly.com/howto/crf250x/crf-v ... stment.php

[sven707]

I just checked the valves,
Intake = .005" or .127mm
Exhaust = .015" or .381mm
I think intake was actually in spec and exhaust has too much clearance. I am on my way to the store for a new shim kit (I can't find mine!). I went the valve route first because I wanted to check them any way. I will check carb/jets tonight.

[sven707]

Still no start.

Valve adjust went as it should, as described. Punch mark on gear lined up, 2 marks on cam gear level, lobes pointing back and all valves are now in spec.

Carb was/is clean and stock, but I put a new 42 (stock) pilot in just to make sure.

I can hear the hot start action opening and closing properly (if thats possible) I adjusted the idle till the slide went all the way down to its lowest position (which still has a small elliptical opening) and then I raised it back up about 1-2 millimeters.

I checked for air leaks at boot

I checked for spark at the brand new plug (just by eye, I don't know how to test or troubleshoot electrical yet)

Then I kicked forever and no start.

Yesterday, the new plug that I took out after I bump started it was wet and looked fouled, like a 2 stroke, black and wet.

I just don't get it, I have had about 10 CRF250Rs and I feel confident in my start procedure. What should I try next?

[HondaRacer213]

Magneto? Just my 0.02....

[HondaRacer213]

Sorry, check the magneto. Even if the plug is firing, it doesnt mean that it gives enough of a charge to start the bike.

[sven707]

Do you know of a how to on how to check that, and is the magneto the same as a CDI? I am a complete novice at electrical. Thanks