rashin Posted August 16, 2011 Report Posted August 16, 2011 I rebuilt the motor fresh over the winter, and taken her on quite quite a few trips since. All of a sudden when I go to start it, it revvs highly at startup even though carb is closed. I suspect there is an air leak somewhere on the case, causing it to be able to suck air and rev up lean (it did not run for more than a second or so)... Does this sounds like a reasonable guess? I havent been able to tear into it yet, I just want to have a good idea of where to look first. Quote
Larry's Shee Posted August 16, 2011 Report Posted August 16, 2011 Get or make a leak down tester, I'll bet it's either carb boots or intake gaskets. Got a boost bottle? Quote
Dahl87banshee Posted August 16, 2011 Report Posted August 16, 2011 I rebuilt the motor fresh over the winter, and taken her on quite quite a few trips since. All of a sudden when I go to start it, it revvs highly at startup even though carb is closed. I suspect there is an air leak somewhere on the case, causing it to be able to suck air and rev up lean (it did not run for more than a second or so)... Does this sounds like a reasonable guess? I havent been able to tear into it yet, I just want to have a good idea of where to look first. Wow now tiger. Expecting the worst just makes you worry.. Lmao check that your carb tops are skrewed on all the way, push your carb towards the other carb and look for cracks/tears in your intake boots, if you have a boost bottle check to see that its sealed tight to the boots or that will leak, pull gaskets off the intake and reeds. Check easy and cheap things first before tearing your motor apart. Because when you put new seals/gaskets in all around the motor and put it all together again and start it and it does the same thing you will kick yoursef... Lol Quote
rashin Posted August 16, 2011 Author Report Posted August 16, 2011 Trust me I understand.... I have a single 38mm PWK carb with 2 into 1 trinity intake. Vforce2 reeds. It has to be something simple because I dont think it could chug that much air through just a ripped seal... I just checked the cylinder base bolts and they are tight. Everything on the intake appeared ok. We'll see once I look into it more. Quote
Zwiser Posted August 16, 2011 Report Posted August 16, 2011 does it countinue to rev high once its warmed up? or just when the engines cold Quote
rashin Posted August 16, 2011 Author Report Posted August 16, 2011 I was too scared to let it run any amount at WOT while it was cold... It ran fine at silver lake two weekends ago. Maybe something was jarred loose on the three hour drive home... I think a leak down test will tell the story. Quote
Larry's Shee Posted August 16, 2011 Report Posted August 16, 2011 Have you looked in carb to see if slide is closed? No sand in throat? I would start by comepletely cleaning carb and inspect intake. Is it a two piece manafold with O-rings? Quote
rashin Posted August 16, 2011 Author Report Posted August 16, 2011 I have trinity stage iv 2 into 1 manifold. I'll take a look and see later today and let you know what I find... Quote
Jereme6655 Posted August 17, 2011 Report Posted August 17, 2011 it doesn't have to be a big leak at all to lean it out enough to make it rev and to melt a hole in your piston.... Quote
rashin Posted August 18, 2011 Author Report Posted August 18, 2011 It's a toasted VForce2 causing the issues... I made a leakdown tester and it held pressure fine. Thanks for the help! (Trust me i'm relieved to find this). Quote
J.J. Posted August 18, 2011 Report Posted August 18, 2011 Good info, thanks for providing feedback and the photos. Quote
rashin Posted August 18, 2011 Author Report Posted August 18, 2011 Who would like to sell me a replacement set of reeds or a set of Vforce3's??? Quote
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