im working on my buddies 07 trx450er.. the compression is a little bit low ....but it has no spark what could be causing no spark and how do i go about testing which ever part could be bad????

it used to run and if you killed it wouldnt start unless pull started it with another atv or something...

it got sunk in the river for short amount of time..

Do i need a peak voltage multimeter??? because everything in the service manual refers to that or will a regular multimeter work????

 

You're right I was wrong, no hot start button on the er models, sorry, my mistake. I have an '04 kicker and assumed all 450R's had the hot start.
So it is getting no spark?
Too bad you don't have another 450r anywhere around, you could switch out the cdi and see if that make a diffrence.
Check all the wiring connections for and corrosion that may have happened since it was in the water.
Was the dealer unable to get it running without pulling it, or did this symptom appear after getting it back from the dealer?

 

pretty sure it was like that right after he got it back.... anything else you guys can think of??

 

hi i also have an 07 trx450 and i have trouble starting mine i didn't sink it or anything i put a brand new spark plug in it and a brand new battery and everytime i try to start it i have to play with the choke and throttle to get it running it is so hard to start any ideas why

 

do you have good spark?? if so check your valve clearances.. sounds like a common problem on these things

 

someone else told me that to but what i don't know now is how to adjust them

 

Find top dead center on compression stroke a believe i will get the bible out and let you know what clearances should be

ANYONE THAT KNOWS HOW TO FIND THE TDC to adjust valves plz chime in

 

They do:

http://www.trx450r.org/forum/

 

ya i don't know how to find top dead center on the compression stroke

 

ya i don't know how to find top dead center on the compression stroke