sprinklerman Posted December 23, 2012 Report Share Posted December 23, 2012 also check the carbs float level. Quote Link to comment Share on other sites More sharing options...
dirtydownunder Posted December 23, 2012 Report Share Posted December 23, 2012 no headgaskets with cool heads. only orings. how much are domes from pro design ? Quote Link to comment Share on other sites More sharing options...
elgoyoloco Posted December 23, 2012 Author Report Share Posted December 23, 2012 Yup choke tube is in, slides are correct and float levels are good. I definitely agree with an air leak, but its not in the engine, has to be in the carbs. I unscrewed the choke valve and pulled it out of the carb. Its was pretty caked with sand and crud, kinda makes me think it was pulling air through there. Guess I'll clean it and put it all back together then spray with carb cleaner while running to see if anything changes. I think I'll scrap the carbs anyways, they've worked hard and good for a while, but now they're just wasting my money. Plus I'm sick of looking at them. Quote Link to comment Share on other sites More sharing options...
C&B Posted December 28, 2012 Report Share Posted December 28, 2012 youve lost youre left side crank seal son Quote Link to comment Share on other sites More sharing options...
robert0762 Posted December 28, 2012 Report Share Posted December 28, 2012 If choke is all dirty then ur jets are clogged too. Tear down carve and thouroughly clean them Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted December 28, 2012 Report Share Posted December 28, 2012 6 psi for 15 mins? Definitely carbs! Go through them like a detective. Also try domes from a good builder. Will totally be worth it Quote Link to comment Share on other sites More sharing options...
Sandfrk33 Posted December 30, 2012 Report Share Posted December 30, 2012 I hope its not, but I have to ask. Did you put a gauge on the leak down tester with a relief button. It will hold the pressure till you push the button. Just trying to help. Only thing that comes to mind Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted December 31, 2012 Report Share Posted December 31, 2012 Leak down b4 you blow again,did you say head gasket,I thought you had cool head?if you use both stock head gasket and cool head it will wear grooves in the deck of the cylinders making any sealing after that a problem Quote Link to comment Share on other sites More sharing options...
Finch Posted December 31, 2012 Report Share Posted December 31, 2012 my guess is stock head gasket and cool head your getting coolant in your cyls. and not the right way to get your squish looser either! Quote Link to comment Share on other sites More sharing options...
Burt Reynolds Posted December 31, 2012 Report Share Posted December 31, 2012 You have a major air problem somewhere. A clogged pilot wont lean it that bad,it would just run like crap. A clogged main then it just wouldnt rev. Hell even putting one of your air screws at 5 turns wouldnt lean it out THAT bad. Quote Link to comment Share on other sites More sharing options...
elgoyoloco Posted January 4, 2013 Author Report Share Posted January 4, 2013 Definitely not a crank seal because leak test shows good. I'm using a cooling system pressure tester for leak down so there is no bleed port. Also confirmed by immediate pressure drop when spark plugs are loosened. I'm using the single layer steel head gasket more of just a shim to drop the compression down slightly so I feel better with the readings. I'm also thinking my Snap-On compression tester is a bit inaccurate (showing high) so I'm going to borrow a coworkers to compare. Gasket flattens smoothly with adequate clamping force which shouldn't cause any etching issues. Can't be plugged main because I've been richening the mains to get the left cylinder not so lean. I appreciate everyone's help but there's really nothing left but the carbs. I'm going to dissect them some more but there's really not much to them. They are showing they're age, slide coatings are pretty much worn off and that choke valve has got me uneasy. Quote Link to comment Share on other sites More sharing options...
badassbanshee479 Posted January 5, 2013 Report Share Posted January 5, 2013 Have to checked to see if the needles are in the same position? Air screws clean and same spot? Reeds in good shape? I wouldn't run a gasket and a cool head... If you wanna loosen squish up and lower compression get a thicker base gasket or have domes cut... I would deff gut the carbs and look them over real close... Could be sucking the bowls dry also... Make sure vent on tank is clear and working also there's a screen on the petcock... Check to see if its clean... With it passing leak down I would say you have a fuel delivery issue... Quote Link to comment Share on other sites More sharing options...
elgoyoloco Posted January 9, 2013 Author Report Share Posted January 9, 2013 Went over the carbs some more. Tested choke circuit on left carb with a vacuum pump and confirmed significant air leak though choke valve shaft. I'm going to remove head gasket, reset my timing to +4 and replace carbs. So the next concern is 21cc dome okay for pump gas and 28 vs 33mm pwks. I know the 33's would be too big for stock bore/stroke but would they be better for future upgrades? It's not going to be set up for drags, it is a dune machine so its going to end up with a 4mm stroker and ported to match. Most likely stick with standard bore... maybe 68's. Quote Link to comment Share on other sites More sharing options...
elgoyoloco Posted January 9, 2013 Author Report Share Posted January 9, 2013 And by "future" upgrades I mean as soon as I stop melting holes in pistons. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted January 9, 2013 Report Share Posted January 9, 2013 Go with the 33's and be done. At least till you want even more. 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.