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not turning over.

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Hey guys i have a 2008 crf250r and the other day i was at a local practice track and the bike started good and ran good for about two laps and then it started to bog and i just figured i was in to high of gear but i wasn't. the bike died two turns later. i tryed to start it back up but the compreshion was really hard and did not start. later that day i tryd again but after two or three kicks it got so hard that i couldnt even turn it over. when i got home i changed the spark plug. and it helped for about 10 kicks and then lucked up.

so what is going on?

is it bad gas?

or

eletrical problems?

btw what should i be running for gas. i am running 89 pump.

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I run the highest octane (pump) that i can find whenever i need 2 fill up.

Can't think right now it's too late but that makes no sense if it kicked easier when you replaced the plug.

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You should be running atleast 91 octane pump fuel.

How much oil do you have in the bike? Is it clean? It should be changed after every ride / 1 to 2 hrs / one tank of gas. Both engine and transmission - I use Shell Rotella T 15w40.

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your carb might be running REALLY rich. sounds to me like the piston is being hydro locked, or maybe some other mystery liquid got in their.

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ya im bringing the bike into the shop today and have them look it over. ya i does seam that the piston is locked.

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the guy at the shop just called and sad that the rod barings went out. what caused that?

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to many hours on the engine having the bike on the rev limiter for extended peroid or jus not enought oil

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ya about 4 hours before this happend i crashed and the bike was on its side and the throttle was stuck wide open for like 5 seconds or so. the bike was still in gear so i couldnt just pick it up. so i was looking for the kill switch but was panicking so couldnt find it. and then the bike just killed. I change the oil often. i do have alot of hours on it for an 2008. a hour a night every night.

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its completely normal for rods to go after too many hours of use but my 08 has arround 200hours race and practice use on it and i still have my 04 race bike wich i keep for practice riding and the hour meter reads 1200 hours and thats still on stock rod but i did have an 07 that blew the rod after 40 hours of riding so it does happen also beining a mechanic myself and knowing people that have draged cars for years little imperfections in metal can make a huge differnce in reliabality of a motor it can happen wen parts just fail so i would get it fixed and not worry too much about it

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ya thanks im getting it fixed right now. i run 89 gas. but when i pick up the bike im going to get some 93 i think.

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its completely normal for rods to go after too many hours of use but my 08 has arround 200hours race and practice use on it and i still have my 04 race bike wich i keep for practice riding and the hour meter reads 1200 hours and thats still on stock rod but i did have an 07 that blew the rod after 40 hours of riding so it does happen also beining a mechanic myself and knowing people that have draged cars for years little imperfections in metal can make a huge differnce in reliabality of a motor it can happen wen parts just fail so i would get it fixed and not worry too much about it

amazing yet kinda scary.

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hey guys thanks for all of ur help. i picked up the bike today and raced tonight. i got a 1st and 2nd three times out of thirty people so it was a great night. so thanks for ur help.

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