Ask Your Car Question. Car Experts Answer You ASAP.

(Not a Car Question?)

How many pounds of compression when i do a ...
Sent to Car Experts June 21 03:23 PM

How many pounds of compression when i do a compression test on a 2004 yamaha yfz 450 engine?

 

Optional Information:
2004 yamaha YFZ 450

Already Tried:
everything

Customer (name blocked for privacy)
Status:  Closed   Value: $9
Answer
June 21 3:45 PM (22 minutes and 34 seconds later)
         
ACCEPTEDCheck Mark
Hi welcome to JA,

You will need anything above 140 psi for that motor.

If this has helped please click on accept and give us your feedback.
Picture
Brian -- Auto/Motorcycle Mechanic -- 98% Positive Feedback on 148 Car Accepts
Motorcycle & Auto Mechanic 15+ years, Kawasaki & Suzuki certified, Over 30 Custom Bikes built
Reply
June 21 4:52 PM (1 hour and 6 minutes and 33 seconds later)
         
This is the 3rd answer that ive found on the web and i really am not sure wich one to go with... Yamaha mechanic says- 120+
Atv Forum says 115+
and you say 140+

Could i ask where you got the information? maybee leave me a link? then i will check it out and accept this answer..

Thanks A BuncH!!!!

QuadMAFIACrew
Customer (name blocked for privacy)
Answer
June 21 5:04 PM (11 minutes and 32 seconds later)
         
THIS ANSWER IS LOCKED!
You can view this answer by clicking here to Register or Login and paying $3.
Picture
Brian -- Auto/Motorcycle Mechanic -- 98% Positive Feedback on 148 Car Accepts
Motorcycle & Auto Mechanic 15+ years, Kawasaki & Suzuki certified, Over 30 Custom Bikes built
Reply
June 21 5:10 PM (6 minutes later)
         
well i payed the yamaha mechanic to put drop in hotcams and a timing chain in my bike. well he bitched and moaned about putting the timing chain in cuz its too much work he says. Well long story short the chain got too hot, stretched and jumped about 6 teeth on the exaust cam sprocket making me fear the worse had happened. I am thinkin that one of thevalves hit the piston on TDS and bent one. so i was just checking to see if that was it for sure, because i cant get it to start now even with all of the marks lined up. It backfires out the exhaust and acts like it wants to start a little but wont. Plenty of spark and plenty of gas. The compression on it right now is at 110 psi. wich makes me think i did bend a valve...

Thanks

Nate;
QuadMAFIACrew
Customer (name blocked for privacy)
Answer
June 21 5:21 PM (11 minutes and 10 seconds later)
         
THIS ANSWER IS LOCKED!
You can view this answer by clicking here to Register or Login and paying $3.
Picture
Brian -- Auto/Motorcycle Mechanic -- 98% Positive Feedback on 148 Car Accepts
Motorcycle & Auto Mechanic 15+ years, Kawasaki & Suzuki certified, Over 30 Custom Bikes built
Reply
June 21 5:28 PM (6 minutes and 58 seconds later)
         
Some other idiot took it for a joy ride and took off all drunk n shit. Held it wide open for at least 4-5 min. I told that guy that he got the fuken engine too hott and it skipped a tooth... Ya just dont abuse them like that.. ya kno..but it shouldnt have dun it if that new chain was in.
Yes it is the compression stroke when i line up all the marks. Thats what ya get for lettin other people touch your shit. This yamaha guy is a complete moron as far as im concerned. I payed him 125 to put the cams in and an other 100 to tell me that its f**ked up... i cuda told him that... Im PO'd....

Thanks for all of your time! you have been super helpfull.   O yea,
\Where can i find cheap valves and springs for it? Ive been looking all over the net...


Thanks

Nate
Customer (name blocked for privacy)

www.myspace.com/n8yfz450
www.myspace.com/scarryharry
Customer (name blocked for privacy)
Answer
June 21 5:52 PM (24 minutes and 41 seconds later)
         
THIS ANSWER IS LOCKED!
You can view this answer by clicking here to Register or Login and paying $3.
Picture
Brian -- Auto/Motorcycle Mechanic -- 98% Positive Feedback on 148 Car Accepts
Motorcycle & Auto Mechanic 15+ years, Kawasaki & Suzuki certified, Over 30 Custom Bikes built
Think you can answer this question?
Login or Become an Expert

Related Answers

 

DISCLAIMER: You acknowledge that any information you may obtain from individuals you contact through use of the Just Answer service comes from those individuals, not from Just Answer!, and that Just Answer is not in any way responsible for any of the information these third parties may supply. The site and services are provided "as is" with no warranty and no representations are made regarding the qualification of an Expert. Responses and comments on Just Answer! are for general information and are not intended to substitute for informed professional advice (such as medical, legal, investment or accounting) and do not establish a professional-client relationship. Just Answer! is not intended or designed to address EMERGENCY QUESTIONS which should be directed immediately by telephone or in-person to qualified professionals. Please carefully read the Terms of Service.

Just Answer! > Car Repair