<

CNYMRA - District 3 MX

CLASSIFIED SECTION FOR INDIVIDUAL BUYING/SELLING ONLY - NOT FOR COMMERCIAL ADVERTISING

All other posts will be removed.

Registration is required to post your ad here. You may choose your own User Name and password. A valid e-mail address is required.

Members Login
Username 
 
Password 
    Remember Me  
 
CNYMRA Main Page -> CNYMRA Classifieds -> CNYMRA Classifieds -> low compression help needed
Post Info TOPIC: low compression help needed
250RNUT

Expert Poster

Status: Offline
Posts: 304
Date:
low compression help needed
Permalink  

No silencer will not matter. Is your piston the correct overbore size to match your bore? Are your cylinder and head properly torqued?



-- Edited by 250RNUT on Tuesday 7th of February 2012 04:24:01 PM

__________________
trader

Newbie

Status: Offline
Posts: 2
Date:
Permalink  

1989 cr125 that was just bored .40 over had new piston, rings, and gaskets top to bottom, but when i kick it over i get 50-60 psi compression and wont start. note- i have no silencer on it would that make it not start due to no back pressure??




__________________
jcbemer

Expert Poster

Status: Offline
Posts: 100
Date:
Permalink  

When your kicking it over doing the compression test are you holding the throttle wide open? That is the correct way to conduct the test if that isnt the way that your doing it.

__________________

Our greatest glory consists not in never falling, but in rising every time we fall
magnumandthor

Expert Poster

Status: Offline
Posts: 260
Date:
Permalink  

put piston in backwards?

__________________
trader

Amateur Poster

Status: Offline
Posts: 65
Date:
Permalink  

everything correct to my understanding and have wide open throttle with same reading. ill strip it down again this weekend and see if i see something i messed up on. ive also heard something with the power valve being off could cause this. im not to familar with that i just got the bike and i always rode 4 strokes.

__________________
big d

Expert Poster

Status: Offline
Posts: 236
Date:
Permalink  

check your ring gap. thatll tell you if your overbore was big enough.

__________________
pain hurts now but with faith and time, all pain heals..
fmr554am

Expert Poster

Status: Offline
Posts: 363
Date:
Permalink  

Sounds like a stuck ring or an incorrect piston/ring size.

__________________
trader

Amateur Poster

Status: Offline
Posts: 65
Date:
Permalink  

thanks for the suggestions ill strip it down and let you know what i find out this weekend


__________________
Page 1 of 1  sorted by
Quick Reply

Please log in to post quick replies.
CNYMRA Main Page -> CNYMRA Classifieds -> CNYMRA Classifieds -> low compression help needed
Tweet this page Post to Digg Post to Del.icio.us