My guess would be that it might be low on COMP. How many hours are the bike?What year is it?
Wont Start
My ER won't start unless it is pulled and pop started. All started to happen when the battery crapped the bed on me. I put a new battery in and it cranks cranks and cranks but won't start. As soon as I hook it up to one of my buddies quads and I pull it down the road and pop start it....bam fires right up. I am getting spark and fuel. My other guess would be valve clearance...any opinions?
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my bet is it's been a while since the valves were adjusted........if the valves get off it won't crank but you can pull start.
so check your valve lash.......me
so check your valve lash.......me
check the spark plug and if its not that id say valves
I bet valves out of adjustment, also. Specifically, I bet the intake valves are WAYYYY too tight. Seen it a bunch of times. Also, if your valves are beginning to tighten up this bad, it may be time to look into getting new valves. Also check cranking compression while you're in there. ERs usually work best between 60-70PSI
when i got my er it was the same thing, battery was toast. put a new battery in it and still wouldnt start. ended up putting a new starter clutch on it and starts up awesome everytime
pgreenlaw you have it right on the button! I checked the valve clearance today and the intake valves were like you said "WAYYY" too tight. I just ordered my new shim kit (buddy used my last one and never gave it back and me is across the country now!) but hopefully that fixes it!
While i was in there i adjusted my decompression valve to .025 as the service manual states just to see if that helped any. (I know i should use a pressure gauge but i didn't have one at the time) and it wants to try and fire but still won't start...so i think i've found the other culprit! I just want to thank all of you for your responses they were all a great help! I'll let you know after I change the shims!
While i was in there i adjusted my decompression valve to .025 as the service manual states just to see if that helped any. (I know i should use a pressure gauge but i didn't have one at the time) and it wants to try and fire but still won't start...so i think i've found the other culprit! I just want to thank all of you for your responses they were all a great help! I'll let you know after I change the shims!
pgreenlaw you have it right on the button! I checked the valve clearance today and the intake valves were like you said "WAYYY" too tight. I just ordered my new shim kit (buddy used my last one and never gave it back and me is across the country now!) but hopefully that fixes it!
While i was in there i adjusted my decompression valve to .025 as the service manual states just to see if that helped any. (I know i should use a pressure gauge but i didn't have one at the time) and it wants to try and fire but still won't start...so i think i've found the other culprit! I just want to thank all of you for your responses they were all a great help! I'll let you know after I change the shims![/b]
Glad you found the culprit, but be aware that your valves are tight for a reason. Either, it has been WAAAAAAAAAAYYYY too long since your last adjustment (if ever done). Or, your valves are getting worn out horribly hurting performance and dancing on the line of engine destruction. Just a word of advice, get the head checked out soon. Now is probably a good time to freshen everything up. You can get away with a new set of valves and piston ring kit relatively cheap. And it's better than dropping a valve and creating a completely avoidable problem.
Having similar problems after a top end rebuild and valve adjustmet. I set the decomp arm to the factory spec, but it still wont start worth a crap. Is the only way to get it right is to do a cranking compression check and adjust it from there?
Dont know if you fixed it yet. But what happened to me was my valves were a little too tight and the bike would start but it was sooo noisy and didnt sound right at all. Then after i got them all fixed it would crank and crank but never fire, checked the decomp was at .025 and WOULD NOT crank. So i got a comp tester and upped it to 60 psi and it starts PERFECTLY hot and cold now. I think the .025 is too tight for aftermarket cams but your problem may just be the valves.
i had the same problem with my 06, and went 2 my dealer and i got told there was a re-call on 06 trx450rs saying the starter clutch is crap...
Does anyone know what the decimal value for 60 psi would be?
The clearance is going to vary from machine to machine depending on engine setup. Different pistons, cams, compression ratios, ect... will all change cranking compression, which is why the best and most accutare way to set cranking compression is with a compression gauge. (can be found for less than $20)Does anyone know what the decimal value for 60 psi would be?[/b]
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