LiftdT4R Posted July 31, 2008 Report Share Posted July 31, 2008 Hey, what's up? So Im still having my overheating problem. I went back to stock carbs from the 28mm Keihins. The engine is basiucally all stock except for pipes, a coolhead (22cc domes) +4 timing and nology coil. It still has the full air box. The engine is also off of a fresh rebuild. Pistols rings, bore and hone. The engine gets really hot really quick, and then the radiator starts puking out of the overflow tube. This is just from idling. Here's what I've checked so far: - Jetting, 260mains, 25 pilots, air screws 1 1/2 turns out, syched carbs, I ran this exact setup before the rebuild with 0 problems. -Plugs, BR8ES, look good, didnt do a plug chop though because the bike is overheating - Leakdown test, It was hard as hell to keep the plugs in the boots, but when I did it held 6 psi for 10 minutes with no drop. - Compression, has 120 PSI in both cylinders - Tore down and expected cooling system. Everything appears fine, the water pump turns easy, and none of the tubes looked clogged. Bike has an OS rad which is filled all the way up. I'm at a loss now, everything appears to be fine, but like I said, the engine and radiator are too hot to touch after about a minute of idling. My other banshee I can touch the engine after 10 minutes of idling, and it never ever gets this hot even after riding. I'm super lost on what's causing this, and I hate overheating a brand new engine. I looked inside the exhaust port when I had my pipes off, and everything looks ok, the cross hatching is still visible in the cylinder, but there was a lot of oil in the exhaust port. I think it's from the oil I put on the pistons when installing them though. Otherwise the rings are still on pistons, and they feel tight. If anyone has any suggestions it would be greatly appreciated. I have a trip on the 6th and I'd really like to bring this bike with me. But I can't get it to stop overheating when idling. Quote Link to comment Share on other sites More sharing options...
lilmegill727 Posted July 31, 2008 Report Share Posted July 31, 2008 (edited) do you have the stock plastic or the aftermarket billet aluminum impeller? if you have the stock, thats probably why its overheating. Edited July 31, 2008 by lilmegill727 Quote Link to comment Share on other sites More sharing options...
LiftdT4R Posted July 31, 2008 Author Report Share Posted July 31, 2008 do you have the stock plastic or the aftermarket billet aluminum impeller? if you have the stock, thats probably why its overheating. Nope, billet impeller, gears are good, installed it at the same time as the rebuild. Quote Link to comment Share on other sites More sharing options...
lilmegill727 Posted July 31, 2008 Report Share Posted July 31, 2008 oh then i dont know hope you get it figured out Quote Link to comment Share on other sites More sharing options...
Snopczynski Posted July 31, 2008 Report Share Posted July 31, 2008 Unless you have physically checked the temperature of the coolant, I would not be convinced its overheating. My bike pushes coolant out sometimes at 180 degrees. So get yourself a temp gauge cap and check it again to make sure your not chasing your tail. Quote Link to comment Share on other sites More sharing options...
hercalmighty Posted July 31, 2008 Report Share Posted July 31, 2008 I havnt rebuilt a banshee yet but I know on my bikes the base and head gasket have to go on one way. Did you check and make sure they are on right? If you have it on wrong you might be covering a coolant passage. Off topic, what year yz80 is that? Quote Link to comment Share on other sites More sharing options...
LiftdT4R Posted July 31, 2008 Author Report Share Posted July 31, 2008 Unless you have physically checked the temperature of the coolant, I would not be convinced its overheating. My bike pushes coolant out sometimes at 180 degrees. So get yourself a temp gauge cap and check it again to make sure your not chasing your tail. Hmm, thats what I was kind of thinking because I'm not stupid, and I don't think I fucked this thing up that bad. But again, it just seems to be running so much hotter then my 2002. I'm running an OS gas tank, so I can't use the regular temp gauges. Any idea on where to get one that goes on the cap??? Quote Link to comment Share on other sites More sharing options...
LiftdT4R Posted July 31, 2008 Author Report Share Posted July 31, 2008 I havnt rebuilt a banshee yet but I know on my bikes the base and head gasket have to go on one way. Did you check and make sure they are on right? If you have it on wrong you might be covering a coolant passage. Off topic, what year yz80 is that? It's a cool head, so there's no head gasket, it's all O-Rings, but as for the base gaskets, that's a good question, I really don't remember, but I don't know how hard they are to mess up. But like I said, no air leaks. The YZ is a 1993, it's for sale too :biggrin: If your around NJ I'll give you an awesome deal on it, but it needs a clutch. Quote Link to comment Share on other sites More sharing options...
hercalmighty Posted July 31, 2008 Report Share Posted July 31, 2008 (edited) If your gasket is on wrong you would not know unless you pulled it apart. Like I said if its covering a coolant passage the coolant wont flow and it will heat up. If you just rebuilt it you should be alright pulling it apart to check the base gasket. Also I think that might be a 92 not a 93. The 93's were all new and look like the ones they have out now. All you have to do is flip over the gasket and it could block a passage on a bike so it might be the same on a shee Edited July 31, 2008 by hercalmighty Quote Link to comment Share on other sites More sharing options...
Snopczynski Posted July 31, 2008 Report Share Posted July 31, 2008 If your gasket is on wrong you would not know unless you pulled it apart. Like I said if its covering a coolant passage the coolant wont flow and it will heat up. If you just rebuilt it you should be alright pulling it apart to check the base gasket. Also I think that might be a 92 not a 93. The 93's were all new and look like the ones they have out now.All you have to do is flip over the gasket and it could block a passage on a bike so it might be the same on a shee Coolant doesn't flow through the base gaskets on a banshee. There are rubber plugs in the bottom of the cylinders that block the coolant passages. Plus there is no where for the coolant to go into the case. You can get the caps from summit racing or autozone. Quote Link to comment Share on other sites More sharing options...
hercalmighty Posted July 31, 2008 Report Share Posted July 31, 2008 Ok. Cool. Like I said I havent rebuilt my banshee yet so I wasnt sure if it was the same as my dirt bikes. Thanks for the info Quote Link to comment Share on other sites More sharing options...
LiftdT4R Posted July 31, 2008 Author Report Share Posted July 31, 2008 Coolant doesn't flow through the base gaskets on a banshee. There are rubber plugs in the bottom of the cylinders that block the coolant passages. Plus there is no where for the coolant to go into the case. You can get the caps from summit racing or autozone. You dont have a part # by any chance or a link? I saw them on both of the websites but unfortunately when you have to select your vehicle they don't have a Banshee. I'll porbably just be able to bring my cap down to Vato Zone and get them to match it up though. Thanks man, big help!! Quote Link to comment Share on other sites More sharing options...
Snopczynski Posted July 31, 2008 Report Share Posted July 31, 2008 Its the import one. Quote Link to comment Share on other sites More sharing options...
CadillacBanshee Posted August 1, 2008 Report Share Posted August 1, 2008 If the water does not come out super how it could be your radiator cap or you have a leak, so check compression. If its getting too hot too quick, check jetting and timing. david Quote Link to comment Share on other sites More sharing options...
okbeast Posted August 1, 2008 Report Share Posted August 1, 2008 What had you convinced it was overheating? My bike will spit out some coolant sometimes after riding hard (and usually after filling it). I just assume the coolant has expanded more and is purging out the overflow, no harm no foul unless it's BOILING over. Quote Link to comment Share on other sites More sharing options...
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