jeff n Posted June 29, 2015 Report Share Posted June 29, 2015 I was told that my new top end (shop installed)and probably the crank bearing are toast because I had to have been to crazy with my break in and had to have let off the throttle from a high rev and leaned out the dominant cylender and that it couldn't have been because of an air leak. And for the record my son, on a blaster was able to keep up with me on a ported 4mil during break in. Or my theory is that something didn't get torqued down properly, or gaskets or surfaces weren't 100% clean creating an air leak that leaned out that cylender. Is either one possible? Is one more likely than the other? Quote Link to comment Share on other sites More sharing options...
jeff n Posted June 29, 2015 Author Report Share Posted June 29, 2015 This is the plug. The other look okay, darker and kind off wet looking Sent from my VS985 4G using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
Bennett131 Posted June 29, 2015 Report Share Posted June 29, 2015 Sounds like your shop is FOSThis...and just for the record he means full of shit. Quote Link to comment Share on other sites More sharing options...
special06shee Posted June 29, 2015 Report Share Posted June 29, 2015 Its actually not wise to backload from a high rev. With that said, id think it take a 27mile long, extreme incline, turning higher rpms to make a plug look like that. Edit: as long as motor is in good working order and not on ragged edge. Quote Link to comment Share on other sites More sharing options...
BANSHEEBEEFM2M Posted June 29, 2015 Report Share Posted June 29, 2015 Shop fucked you. Sorry bro Quote Link to comment Share on other sites More sharing options...
bluebanshee98 Posted June 29, 2015 Report Share Posted June 29, 2015 We do have site sponsors on here for a reason.... Quote Link to comment Share on other sites More sharing options...
Larry's Shee Posted June 29, 2015 Report Share Posted June 29, 2015 I bet I know his name BEN DOVER !!! Smoke blown up ASS priceless Quote Link to comment Share on other sites More sharing options...
Bennett131 Posted June 30, 2015 Report Share Posted June 30, 2015 Which cylinder is "dominant"? 1 Quote Link to comment Share on other sites More sharing options...
n2otoofast4u Posted June 30, 2015 Report Share Posted June 30, 2015 I was told that my new top end (shop installed)and probably the crank bearing are toast because I had to have been to crazy with my break in and had to have let off the throttle from a high rev and leaned out the dominant cylender and that it couldn't have been because of an air leak. And for the record my son, on a blaster was able to keep up with me on a ported 4mil during break in. Or my theory is that something didn't get torqued down properly, or gaskets or surfaces weren't 100% clean creating an air leak that leaned out that cylender. Is either one possible? Is one more likely than the other? L...........O............L Quote Link to comment Share on other sites More sharing options...
Rigid_Banshee Posted June 30, 2015 Report Share Posted June 30, 2015 Think he means the stator side, or left cylinder when sitting on the bike. Yamaha specifies the left cylinder as: Cylinder #1. Quote Link to comment Share on other sites More sharing options...
Tedder Posted June 30, 2015 Report Share Posted June 30, 2015 I've got a pair of very similar looking plugs and have had a few not quite as bad but IMO there's no doubt the cause was a lean condition and since the other side looked rich and wet most likely there's an air leak. Unfortunately from the sound of it I suspect your "shop" will never admit blame. I'd do a leakdown test before anything else. Quote Link to comment Share on other sites More sharing options...
m671054 Posted June 30, 2015 Report Share Posted June 30, 2015 Which cylinder is "dominant"?The one thats not blown up of coarse. Op has 2 choices. Sell and buy a new fourstroke he can take to the dealership,or learn to work on his own stuff as the local shop is not very good. Quote Link to comment Share on other sites More sharing options...
jeff n Posted June 30, 2015 Author Report Share Posted June 30, 2015 That's been my impression so far. Can anyone tell me if there's a way to tell or what to look for to see if it was an air leak or if it was the rev thing? Sent from my VS985 4G using Tapatalk Quote Link to comment Share on other sites More sharing options...
Bennett131 Posted June 30, 2015 Report Share Posted June 30, 2015 That's been my impression so far. Can anyone tell me if there's a way to tell or what to look for to see if it was an air leak or if it was the rev thing? Sent from my VS985 4G using Tapatalk Preassure test it before you tear it down. Quote Link to comment Share on other sites More sharing options...
jeff n Posted June 30, 2015 Author Report Share Posted June 30, 2015 Do you really have to spend$300 for a reliable tester? Do the home made one work? Do you just do one side at a time? Never done it and can't find much on a twin cylender 2 stokes. Sent from my VS985 4G using Tapatalk Quote Link to comment Share on other sites More sharing options...
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