Honda ATV Forum banner
1 - 6 of 6 Posts

· Registered
Joined
·
7 Posts
Discussion Starter · #1 ·
Hello to all,

I have posted in this forum once before but didn't introduce myself so thought I would. I purchased a 97 TRX 400 from my neighbor for next to nothing and I am wondering if I should spend more money to fix what are mostly minor problems or just ride it till something actually breaks or it won't run. The problems I posted about before were that the voltage regulator was bad and not charging the battery. New reg on the way. I did a compression test today and only got 90 psi. I put oil in the cylinder and got no noticeable change. I decided to do a compression test because I was getting a consistent misfire at all RPM ranges. the carb has been cleaned and is great now compared to what it was. I put Sea Foam into the carb with engine running and soaked it for 5 minutes and it made a great improvement (luv that stuff). the misfire is much less noticeable. So the question is, as long as it runs decent is there a downside to not doing a top end rebuild? What would the low end psi be on your atv that would prompt you to do a teardown? or is it simply a question of how it is running? The only other problem is the right outside cv axle boot is torn. the joint is still operating fine, there was still some grease in it. we don't run through water here just up and down old logging roads. so, should i take it apart and install a new boot or duct tape it and run it until it starts clicking? I know these are more moral questions than anything else, just wanted to get your opinion...
 

· Premium Member
Joined
·
23,587 Posts
Welcome to the forums. I agree with Mud. If you're planning on keeping the ATV, it would be better to go ahead and fix everything.
 

· Registered
Joined
·
7 Posts
Discussion Starter · #5 ·
I did the first test with the engine cold and got 90 psi, then I put oil in the cylinder and still got 90 psi. So I started it up and got it warm, put some Sea Foam in it let it soak and then ran it again. Then did the test again and still got 90 psi.
 

· Premium Member
Joined
·
38,589 Posts
I did the first test with the engine cold and got 90 psi, then I put oil in the cylinder and still got 90 psi. So I started it up and got it warm, put some Sea Foam in it let it soak and then ran it again. Then did the test again and still got 90 psi.
welcome to the forums...90 psi is low..a trx300 to run great needs a minuim of around 100 psi..and the psi on my '89 trx350 needs 125 psi..id say do a top end tear down..as for the down side if you don't..you may have a good piston now..but..if you wait..it may get damaged later on..why waste the extra money ?..save yourself the trouble..fix it now..also..dusty roads on open cv joints are not good..fix it....or cause more break downs on that side.
 
1 - 6 of 6 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top