[si3328]

I have an 04 CRF250r that I bought from a guy about 3 months ago. When I went to look at it he kicked 3 maybe 4 times and fired right up. It had a little bit of a bog when you hit the throttle real hard (did not notice it after it got warm). After I got it home, I would start it up about every day just to hear it and it took me forever to get it to start. I changed the oil and filters on it as well as the spark plug just so I knew where it was. It is still a pain to get started. Push starts like a champ but idles a little wacky and has always done that. I went a head and shimmed it because I read a lot about thats a main problem in starting these CRF's. Exhaust was spot on and on the intake I could not fit anything under it. I used the calculator on a previous forum on here to get the correct new shims. Used zero as my clearance and used the old shim size to calculate. Ordered the shims put them in put it all back together checked the clearance again and still could not fit anything under it. I then used zero again as my clearance and used the shims I just put in to calculate again for another set of shims. Re-shimmed it according to the CRF's calculator for shimming and still I have no clearance, and still could not get it to start.

SO, what is next now. Do I keep using zero until I get a clearance or is there something else that is wrong. Timing is right and have a good spark. Any ideas!? This is very frustrating for me!

Thanks in advance!!!

[crfsonly]

welcome to CRF's Only! sounds like you are a victim of "Shim and Sell". once the intake valves start to tighten shimming will only give you a few engine hours and future shimming will have diminishing returns.

when they have gone to zero you have no choice but to get a valve job and new valves. the intakes have sunk into the valve seat and there is no way to clearance them. even if you could it wouldn't last an hour before they would tighten to zero again.

you have to get a valve job and new valves. we offer these services and valves. i recommend the Kibblewhite stainless valves as replacements. they will last at least three times as long as the stock valves.

http://www.crfsonly.com/catalog/product ... ts_id/3974

whatever you do, do not get talked into installing new valves without having the valve seats professionally cut.

ken