I'm soo confused....

[lastlegwarrior]

Just like i said i'm soo confused, checked the compression on the shee today and i'm a little bummed. She was pretty puny, 103 psi in the left cylinder and like 95 psi in the right cylinder. But the reason why i'm confused is it doesn't take much at all to start the thing, not first kick but it's not a hassle; the part that is confusing me is that those numbers i believe indicate rebuild time, but it runs soo good. I mean i just beat a '06 450R with a 110lbs. rider the other day no sweat, indeed i should've won with my mods but i'm 210lbs. and i pulled through every gear. (yeah, i know it could've been the rider) Anyways it's been almost two years since the last rebuild (new wiseco's, rings, bore, etc...) and i'm also like many bhq'ers who ride like they stole it. Well i was wondering what i should do, i was going to get a gorr port for a little christmas present, but i'm not sure. Do you think this might be fixed with some new rings, or am i gonna have to get new pistons? Also where is that piston size located on the piston, i know it is silly but i forgot what over bore mine was, .030 or .040. Also if someone could tell me what the piston clearance should be in the cylinder and how much ring gap i should have, yes i realize it is in the clymer's manual but i have seemed to misplaced mine. So here's the deal i'll go look for the clymer manual and you guys can give me some tips/input. thanks.

Edited December 22, 2005 by lastlegwarrior

[iceman]

have you taken the head off and looked at the piston yet? if its toast its toast. just because its rebuild time doesnt mean your bike is gonna run like complete shit though. if its been 2 years since a rebuild and youve been riding hard i would go ahead and get new pistons and everything. do the port too.

[northshore]

I would just take it apart look at it, and then order the parts you need. As for the size of the piston, you should just take it out and measure it with a caliper if you cant find any numbers on it.

[GYTWYPT]

If they are prolites the size is right on top of the piston, but if you have rode it for two years it might take a little cleaning to get the build up off. Unless you run Motul.

[BigRed350x]

First of all, what altitude are you at? That is about normal for some places I ride. When you are up at 8500 ft at the top of a mt. and do a compression test, that might be considered pretty good numbers.

[lastlegwarrior]

yeah that's the thing my altitude is like a 1000ft above sea level. i'm so depressed. ugh.

[Banshee17Racing]

You should be just fine if you get some rings w/ the port. That's what I ended up doing. When you send your jugs to Eric, ask him if he thinks it needs bored or honed. I just ended up getting my cylinders honed w/ new rings when I got the port

 

EDIT: By the way, I'm at 800 ft and my compression was 155 psi (w/21 cc domes) in both cylinders last time I checked.

[sandman4free]

I am doing a top end right now ring gap should be .018-.028" per the climer manual. her copression was 90 psi in each cylinder. it was definately time.

[ogre03]

Another thought, are you sure your comp. guage is reading correctly? It wouldn't be the first false reading in history

[GYTWYPT]

Yeah you definetly want to invest in a good comp. gauge. snap on, mac, even craftsman if you dont want to put out the money for a good one. That might be decent numbers at alttitude buy you are also starting to push the limit on the diffrence between the two. I think 10psi diffrence is max.

[Gargamel]

just take it apart send out for your port work. inspect the pistons if you don't want to replace them and hone and use new rings. I personaly would just do it all at once (top end and port) that way you have everything 100% for the next 2 yrs.