kjh Posted April 11, 2013 Report Share Posted April 11, 2013 My mods: fresh build, 7mil crank, 68.5 bore with wsm pistons in stock ported cylinders, billet head from white knuckle racing, billet impeller, all shift mods, clutch lock up with straight cut gears, a/m chinsese(cheap)radiator running straight engine ice. Fuel = 110 mixed 40:1 with Torco oil. Engine is heating up after about 15 min of riding(above 200), mainly when putting around or when there is no air flow. Runs cool charging up a hill but will heat up when going slower. Jetting is correct. (Had it heat up running rich too) Checked head bolts they are torqued correct. Have no leaks and have done a leak down test. Not sure where to go from here, have thought about trying the oem radiator? or a different head? anybody ever have an air pocket in the cooling system? Too heavy of mods for stock cylinders? Quote Link to comment Share on other sites More sharing options...
kjh Posted April 11, 2013 Author Report Share Posted April 11, 2013 I have had many bikes prior to this not heat up as this one does, granted this is the most hp i have ever run, but it just doesn't seam right. After doing a couple hill climbs i have coolant coming out of the overflow before i get back to camp. Quote Link to comment Share on other sites More sharing options...
possum Posted April 11, 2013 Report Share Posted April 11, 2013 how much compression are you running. wheres your squish at? those 2 things can produce excessive heat. Quote Link to comment Share on other sites More sharing options...
kjh Posted April 11, 2013 Author Report Share Posted April 11, 2013 not sure on compression i would have to check it, don't know what squish is need some help there. Quote Link to comment Share on other sites More sharing options...
kjh Posted April 11, 2013 Author Report Share Posted April 11, 2013 I will check compression tomorrow where should it be? Quote Link to comment Share on other sites More sharing options...
possum Posted April 11, 2013 Report Share Posted April 11, 2013 just noticed that you have a 68.5 bore in stock cyl. Im sure that could cause excessive heat. Quote Link to comment Share on other sites More sharing options...
kjh Posted April 11, 2013 Author Report Share Posted April 11, 2013 yea i was thinking the same thing, should prob consider cubs? Quote Link to comment Share on other sites More sharing options...
possum Posted April 11, 2013 Report Share Posted April 11, 2013 In my opinion. For a ridable bike on race gas 160-170 psi Quote Link to comment Share on other sites More sharing options...
WINDYCITYJOHN400 Posted April 11, 2013 Report Share Posted April 11, 2013 My mods: fresh build, 7mil crank, 68.5 bore with wsm pistons in stock ported cylinders, billet head from white knuckle racing, billet impeller, all shift mods, clutch lock up with straight cut gears, a/m chinsese(cheap)radiator running straight engine ice. Fuel = 110 mixed 40:1 with Torco oil. Engine is heating up after about 15 min of riding(above 200), mainly when putting around or when there is no air flow. Runs cool charging up a hill but will heat up when going slower. Jetting is correct. (Had it heat up running rich too) Checked head bolts they are torqued correct. Have no leaks and have done a leak down test. Not sure where to go from here, have thought about trying the oem radiator? or a different head? anybody ever have an air pocket in the cooling system? Too heavy of mods for stock cylinders? Your pilot jetting is too lean. List your carbs and jets. Quote Link to comment Share on other sites More sharing options...
kjh Posted April 11, 2013 Author Report Share Posted April 11, 2013 38mm mikuni flat slides, 300 mains, 32.5 pilots, needle clip in center position at sand mountain, nv (4000 ft?) Quote Link to comment Share on other sites More sharing options...
Zillaguy Posted April 11, 2013 Report Share Posted April 11, 2013 wow 68.5 on stock cyls.?! I thought 66mm was pushing stock cyls...Is there any sleeve left? You won't get very efficient cooling with cyls that thin... You should Cub it... Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.