YFZ350kid Posted November 16, 2007 Report Share Posted November 16, 2007 last trip out to Dumont Dunes my motor went bye bye, anyway, it looks like the top ring in both cylinders managed to get stuck into the exhaust port a little bit and snag busting up the pistons. My question is, the exhaust ports got a little bit messed up, would it be safe to just bore the cylinders and put new pistons/rings/wrist pin bearings. or should i get port work done, I'll try to post pictures that look halfway descent, but all i have for a camera is my cellphone, so quality may lack a bit. Right piston ring groove damage, left is about the same Quote Link to comment Share on other sites More sharing options...
YFZ350kid Posted November 16, 2007 Author Report Share Posted November 16, 2007 left cylinder exhaust port Quote Link to comment Share on other sites More sharing options...
YFZ350kid Posted November 16, 2007 Author Report Share Posted November 16, 2007 right cylinder Quote Link to comment Share on other sites More sharing options...
blowit Posted November 16, 2007 Report Share Posted November 16, 2007 WEll yeah, the pics don't help but you way want to look at having a porting guy check the ports for proper chamfer or even just port the cylinders to fix your problems. I with many of our customers, we port the bad spots away when working the exhaust port. I strongly recommend a pro look at your issue to see why it hung a ring in both cylinders. a super loose motor can do it but you need to know what happened. Brandon Quote Link to comment Share on other sites More sharing options...
YFZ350kid Posted November 16, 2007 Author Report Share Posted November 16, 2007 well, i know the motor was gettin really really loose, unfortunately i didnt take the time to look into how bad it was, far as i can tell its 100% stock topend except for the coolhead, and its a 97, so 10 years on a topend, it may have been re-ringed but it hasnt been bored. I Wish any of the machine shops that do 2-stroke stuff here in Vegas would actually return phone calls or pick up the phone when i call. I'm really strapped for cash at the moment so im not lookin to get this done right away. I did find one shop in town (quad mania) that will send my cylinders out to be bored/ported (75/cyl for bore and 350/cyl porting). Does that sound like a good deal, or should i send out to one of the highly recommended guys outside Vegas.? Quote Link to comment Share on other sites More sharing options...
black sunshine Posted November 16, 2007 Report Share Posted November 16, 2007 That is a total rip off. Those guys are making alot of money off people for being the middleman. 35-40/cyl for boring and anywhere from 175-450 for porting both cyls. Doesn't cost much to ship cylinders in the US and some builders have a pretty fast turnaround time, especially if you are looking just for a bore/hone and cleanup/chamfer port edges Quote Link to comment Share on other sites More sharing options...
sled Posted November 16, 2007 Report Share Posted November 16, 2007 That is a total rip off. Those guys are making alot of money off people for being the middleman. 35-40/cyl for boring and anywhere from 175-450 for porting both cyls. Doesn't cost much to ship cylinders in the US and some builders have a pretty fast turnaround time, especially if you are looking just for a bore/hone and cleanup/chamfer port edges i agree. thats a big rip off! i would just sent them to someone. its not that much money. Quote Link to comment Share on other sites More sharing options...
akita8 Posted November 16, 2007 Report Share Posted November 16, 2007 Everything costs more in Vegas. I live here and would ship them to FAST racing if I were you. If he bores and hones he should clean up the ports (chamfer). Quote Link to comment Share on other sites More sharing options...
Coupelx Posted November 16, 2007 Report Share Posted November 16, 2007 it usually costs no more than $20 to send a pair of cylinders. I am having Flotek do mine. Quote Link to comment Share on other sites More sharing options...
ClimbAnyHill Posted November 16, 2007 Report Share Posted November 16, 2007 Vance & Hines in Sunland Ca, Bored/Honed/Chambfer'd my cylinders $100, really clean work. I shipped to same cylinders for porting out in Indiana, about $30 3 day service with $200 Insurance. Get that crank checked out too! Quote Link to comment Share on other sites More sharing options...
YFZ350kid Posted November 16, 2007 Author Report Share Posted November 16, 2007 cool sounds like a plan. I'm trying to keep this a mild fun quad with just enough to edge out my buddies on their raptors and yfz's, this banshee is gonna be 100% duner to the core as i doubt it will even get dirt tires on it again. anyway, thanks for all the help on here guys. Brent(yfz350kid) Quote Link to comment Share on other sites More sharing options...
Dgrey Posted November 16, 2007 Report Share Posted November 16, 2007 cool sounds like a plan. I'm trying to keep this a mild fun quad with just enough to edge out my buddies on their raptors and yfz's, this banshee is gonna be 100% duner to the core as i doubt it will even get dirt tires on it again. anyway, thanks for all the help on here guys. Brent(yfz350kid) I recommend Kevin Herr in San Diego. Ported my bike, my buddies bike, and my brothers bike. They run like a CHAMP and he has a fast turnaround time. Check out his web site and give him a call. 99% chance that he will answer his phone if you call at a decent hour. GOOD WORK AND A GREAT GUY. www.herrjugsracing.com Quote Link to comment Share on other sites More sharing options...
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