Blew right piston on GT185, don't know why.
Posted: Sun Jun 18, 2017 7:43 am
I run a charity race around Lake Erie, 650 miles, 12 hours pretty much wide open, only stopping for fuel. I have a extra 2 gallon tank mounted on rear that I turn on when I hit reserve on main tank. This is my third year on this bike, but this year I had new crank seals installed, bored 1.00 mm over with new pistons rings etc. Did a pressure check and holds 5psi all day long, compression 135psi. I got it put together and did the break in and ran about 200 miles prior to race. The bike is stock except the 1.00 mm over bore and no packing in the stock pipes. Stock air filter with stock jetting.
Well I'm flying along I90 at about 7k rpm in 5th gear and this baby is kicking butt. Then I get that bow bow bow of no fuel and reach back and turn on the rear tank. After a bit nothing, so I turn main to reserve and I start making power again. After about 30 seconds turn off main tank reserve and give rear tank another try. Same thing, runs fuel out of lines then bow bow bow. Main tank reserve on and making power. I go through this a few time and then something changed and I can tell somethings not right. Pull over and discover rear tank fuel filter is air locked. I pull right plug and its covered in aluminum and no compression on my thumb over plug hole.
All you experienced 2-stroke guys... Could this fuel scenario of switching back and forth cause my lean condition? Anyone ever hear of this? I am new to 2-strokes and looking for some advice.
Thanks
Vince
Well I'm flying along I90 at about 7k rpm in 5th gear and this baby is kicking butt. Then I get that bow bow bow of no fuel and reach back and turn on the rear tank. After a bit nothing, so I turn main to reserve and I start making power again. After about 30 seconds turn off main tank reserve and give rear tank another try. Same thing, runs fuel out of lines then bow bow bow. Main tank reserve on and making power. I go through this a few time and then something changed and I can tell somethings not right. Pull over and discover rear tank fuel filter is air locked. I pull right plug and its covered in aluminum and no compression on my thumb over plug hole.
All you experienced 2-stroke guys... Could this fuel scenario of switching back and forth cause my lean condition? Anyone ever hear of this? I am new to 2-strokes and looking for some advice.
Thanks
Vince