ok, after i get the compression tester, do i leave the other 3 spark plugs in while i test it, or do i remove them? thanks

 

My compretion tester is my finger.......stick it in and see if you have any compression

 

Removing them all at once is easier, but it shouldn't make a difference either way...

 

the finger method huh? i use the finger method else where. alright cool, thanks keeth.

 

as awesome as the finger method is, it will only tell you if your piston is missing or not.

if you have 180psi180psi180psi50psi, you wont really know.

it doesnt make the slightest difference in the world. the intakes are not shared or anything.. remove all 4 makes no difference

 

ok. compression test done.. from left ro right. 180 PSI, 180 PSI, 150 (done 3 different times and it was between 145-150)PSI, 180PSI anyone got any ideas? i even did a dab of the oil and re checked.. same results. <~~~lost!

 

whats the problem your having

 

oh man. i posted it all up a couple days ago, or atleast i tried to. well its got a really rough idol (vibrates) pretty much when i try and do a wheelie, its really rough, sounds like a misfiring (not any wiring problems or anything like that) its got significant power loss, when i actually do bring it up it vibrates the bike realllly bad, it feels like the back end is literally rattling apart. it does it around 4-5 grand. you cant really tell that much just idoling it, but when your riding it, and you ride out the gears to listen for sounds, it kinda sputters and its just rough, all i can stress is ROUGHNESS and it sounds nasty (inline motor sounding like v-twin imagine that) damn this is really fuggin hard to explain and im sorry. but yea, any ideas... im bettin its the valve thing that snipes was talkin about. man im skrewed huh?

 

what you did is called "spun bearing" which means u over heated a rod bearing and it slightly melted n try'd to squeeze out from under your rod between the rod and counter weight on crank shaft... prolly the cylinder that has low compression.. and since u've continued to run your bike while its making this noise it has scored the crank and warn it un evan so the crank will need replaced/repaired.

 

did the tips of the plugs all look similar?

 

yep all looked the same.. normal ware (sp).

 

fawk!!! thanks mane!!

 

when a 4cyl 4 stroke sounds like a vtwin thats normaly the cause, im not 100% sure its your problem so don't go tearin down ur shi1 untill u let some one listen to it in person that knows about engines.

 

sounds like it has a cylinder thats not contributing power for whatever reason.. no fuel, no compression, no spark

check the exhaust manifolds when its starting to warm up, ill bet one or more are gonna be cold

 

we dropped the oil and the plug bolt magnet had a grip of metal shavings on it... hmm

 

ok. compression test done.. from left ro right. 180 PSI, 180 PSI, 150 (done 3 different times and it was between 145-150)PSI, 180PSI anyone got any ideas? i even did a dab of the oil and re checked.. same results. <~~~lost!





hell if you asked me i would just tell you to burn that P.O.S.:YEAH

 

P.O.S.?

thats why your riding MY old bike huh? (and thats only when I let you)

hahaha...

 

If the oil didn't make your pressure come up then you have a valve that isn't sealing. Check your valve clearances. If those are within spec then do a leakdown test. That will tell you where the pressure is escaping.

Your rod bearing isn't melted. If it was, you'd hear the noise. You'll probably have to take the cylinder head off and get a valve job done.

 

see though before the power loss he just sat down a whoolie and bounced the rev limiter for a few secounds after words.. hmm, oil all in the tranny n oil pick up gulping for oil

 

valve clearance is just how much the valve opens... if a valve is leaking, its due to damage only. theres nothing you can measure without taking the head off.

150 psi is fine man, usually the normal spec is is like a 20-30psi spread.

if you had any damage to rods/crank youd hear it plain as day