92vwgti
New member
ok i know its not a yamaha thread but my brother in law needs advice.. hes looking at buying a 1998 polaris xcr 700 .the owner said the compression was 100 across all 3 cylinders is this normal?isnt 100 a little low? my other brothere in law has a polaris 650 rxl with 130 across all 3 anyways i was thinking that maybe this xcr might need new rings well give me your advice because the owner seems to think that 100 psi is normal
terret725
New member
i just statred at a polairs dealer ship and ive been doin alot of the old triples. its sould be around 120-125. 100 is pretty low. how many times are u pulling it over atleast 3 right?. also on thoes old triples u need to check the motor phaze. u do this by checking sticking a pen or scrwe driver in the top of tme center cylinder and bringing it to TDC then u use the screw driver to measure the depth of the pto and mag side cylinders and they should be no more then a 1/4 diferance in hight. as for the low compresson it most likely will need new rings or the cylinders are scored.
yamaholic22
Active member
try a different compression tester, a lot of them seem to be off
daman
New member
DO you have the throttle wide open when pulling?? and warmed up??
92vwgti
New member
ok well it was tryed with the engine cold and then heated up and also tryed giving gas at the same time..still 100. pulled 4 times each cylinder.. the tester works because ive done reading on 3 other sleds and everything was fine.. i just think the guy is on crack,,he was trying to tell my bro in law that 100psi is normal.. oh well hell be able to make the guy negotiate the price a little.. hes asking 2000$cdn with 5000 miles think its a good buy? also how much is a set of rings about?
daman
New member
Thats low,,work on that price...
92vwgti
New member
exactly what i thought,,, but who would be faster on a lake race a srx 700 vs xcr 700..both stock
Interceptor700
Member
srx should take it. the '98 xcr 700 didn't have valves, the '99 did. If it were a 99 it would give the srx a run, but not the '98. Especially w/ 100 lbs. compression. 5000 miles is def ring time for those engines.
92vwgti
New member
hehehehe exxxxcellent thanks
daman
New member
You may want to think about pistons too, or atleast check 'em out!!!
92vwgti
New member
yeah thats what im going to do..bring down the guys price even more or just look for something else.. cuz a complete piston and ring job will be about what 300-500$ canadian?
92vwgti
New member
ok so i was told that maybe the reason for the compression beeing so low it needs new rings and 3 pistons, but i was also told for this model the pistons are nikasil and that would be costly?
daman
New member
You mean the cyls. are Nic.?????
92vwgti
New member
yea i think its that..the guy that told me this is french so maybe thats what he meant
daman
New member
If she didn't cough a ring or somthing the cyls. should be good still just new
pistons and rings???
pistons and rings???
