Anyone have heating issues with their 102mm overbore Raptor? I have found in the past overboring normally tends too make an engine run a little hotter. My head gasket was leaking upon disassembly and the bolts still had proper torque....anyone have a recommondation on fixing this pesky problem? Thanks guys!

 

Check and make sure the sleeve is flush with the top of the cyl. and maybe use some nylomar (sp?) on the gasket. What gasket were you using?

 

Should a parts store have the nylomar stuff? I used a stock OE head gasket last time. I have a Cometic top end gasket on hand for the buildup this time....the one thats good for up too 102mm. The sleeve is flush. Thanks bud....I appreciate the help.

 

How do you know it was leaking upon dissasembly? Unless you had symptoms before tearing it down its probably just spillage??

 

I should have worded that different too avoid confusion. It was loosing coolant earlier and I could swear it was loosing OIL as well before I tore it down. I have no oil leaks anywhere else????

 

oh, Could be. Maybe get some new head bolts, its good to change em atleast every other time. I seen reviews on water wetter and similar products that say it actually works.

I got a pin hole in my radiator that is hard to see, I get a wiff of it every now and again.

 

I smell AF on occasion as well....I was asuming it was coming from my exhaust since my engine is on a steady diet of the stuff. I need too check my radiator...[img]i/expressions/face-icon-small-sad.gif[/img]. THanks gentlemen.

 

I just fixed mine last summer, its leaking again but in a different spot (seems to be where the fan mounts, I had to bend the tab up and out of the way to get at it)

I taped up the ends and used an air nozzle from my compressor to find the thing, if its out in the open it may be easier to spot.

 

Before installation, I sprayed my Cometic HP head gasket with a Felpro copper spray (sssh, don't tell Bob:-). I also torqued the bolts a little further than spec. I went up from some low number, like 24, in 2 ft/lb increments and at 28, went to 1 ft/lb increments. At 31 ft/lbs, I felt the head bolts stretch and stopped. The end torque wrench moved maybe 1/16" more than it moved on the previous 1 ft/lb increments. Maybe it wasn't the head bolt stretching, maybe I was on the ragged edge of stripping the threads?:-) Anyhow, mine never used a drop of coolant or oil. It could have been dumb luck or a combo of assembly "deviations". The guy that bought my Craycraft 686 just won a XC race with the motor and my old Holeshot XCTs.

You guys should look at the 2 aluminum radiators for the Raptor, IMS/Fluidyne and a new one that I can't remember right now. I bought the IMS/Fluidyne for my 727 and it's a real nice unit. Much more rugged than stock and twice as thick. The aluminum mounting tabs are very sturdy, at least 1/8" and maybe 3/16". My motor is still at Santa's Workshop so I haven't had a chance to use it. yet. If it performs as good as it looks like it should, well worth $300 - $400. I'm removing the fan and thermostat and adding a temp gauge, I'll let you guys know how it all works. After reading the article on coolant additives, I'm going to run straight Engine Ice.

 

I know not every one runs in the Dunes but , I switched to Alky and my heating issues are over.[img]i/expressions/face-icon-small-smile.gif[/img] It also runs better than ever.