Newsletter Facebook Click here to find out more!

My YFZ450 revs up to a high idle when hot

  
User Name:
Password:
Join FREE Now!
Forgot Password?
Forgot User Name?
Remember Me
Home | Active Posts | Search | Register | Terms | FAQs
Rss
Item Posts    Sort Order

My YFZ450 revs up to a high idle when hot

 
Crashweir Crashweir
New User | Posts: 2 | Joined: 07/09
Posted: 07/21/09
07:59 PM

I bought this for my hubby, it is a 2003 YFZ 450. He raced, rides, I am learning. The problem is it will rev up to high RPMs on it's own when it gets hot. Scares me to death, but the hubby just says to go faster. lol. Not much fun for me.

Here is the troubleshooting we have done:
Throttle cable is questionable; checked needle clip position; sprayed the carb to make sure there were no leaks; my dh took the carb apart and cleaned it.

Runs great otherwise, but please don't tell me to stay off the quad, 'cause I may not let him on my boat. Wink

Any insight would be appreciated. It does not look like an air leak at this point, and yes, I know what that means. I might be a girl, but I buy good, if not perfect gifts.  

Thank you for any input or options.

Nance  

 
wolf1 wolf1
Addict | Posts: 4283 | Joined: 11/07
Posted: 07/31/09
06:51 AM

check for trash or water in the carburetor, also check the fuel/air mixture, if it is too lean it will rev high.

if the fuel/air mixture isn't right it may load up on fuel one minute and starve the next.  
ALL REPAIR ADVICE GIVEN FREELY, I CANNOT ATTEST TO YOUR MECHANICAL ABILITY FOLLOW AT YOUR OWN RISK

Wolf Performance
...KEEP IT RUBBER SIDE DOWN!!....