bronco91shee Posted June 29, 2015 Report Share Posted June 29, 2015 engine-+4mm stroker, mild dune port, FAST head, stock carbs with twist throttle, +4 timing, K/N in box.Fatties. Last summer after stroker rebuild it was running great down a trail and just died. Found ground wire on stator broke off. New stator, and ever since the left side is issues. Runs 20F hotter at head and 40F hotter at exhaust port just idling. Misses alot at part throttle. it also has weak exhaust pulse on left side compared to right through out entire range. Runs great at WOT. Throughout about 10 hours of riding, adjusting, checking, replacing things it has blown the left spark plug out 3 times, good threads in head, new head. new plugs, does not matter. New V4 this weekened, no help. No intake leaks, no cross tube leaks. swapped plugs and wires left to right-no diff Swapped carbs left to right and the miss tends to go away, but still bogs in mid range like needle jet, changed that to all five positions and it did not help. swap carbs back and misfire is back on left side. Of course been through carbs several times. Checked float height and intake air screws, needles. Compression is 128psi left and 130psi right at sea level, which is the same it was after the rebuild so no worries there. Out of ideas. Any one else have some? Thanks in advance Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted June 29, 2015 Report Share Posted June 29, 2015 Pressure test results ? Could have an air leak or a clogged circuit my advise is stop driving it till you test it blowing spark plugs out is a cry for help Quote Link to comment Share on other sites More sharing options...
bronco91shee Posted June 29, 2015 Author Report Share Posted June 29, 2015 Not sure what you mean by pressure test results. I have stopped running it now since it popped out with a new plug. First two times I questioned my install method of a used plug(crushed washer) on a new aluminum head. Thanks for helping Quote Link to comment Share on other sites More sharing options...
okbeast Posted June 29, 2015 Report Share Posted June 29, 2015 Have you done a full leak down test? Sent from my LG-D850 using Tapatalk Quote Link to comment Share on other sites More sharing options...
bronco91shee Posted June 29, 2015 Author Report Share Posted June 29, 2015 No idea how to do a leak down on a 2-stroke. Quote Link to comment Share on other sites More sharing options...
okbeast Posted June 29, 2015 Report Share Posted June 29, 2015 Do a little research on the site there are plenty of threads with explanation Sent from my LG-D850 using Tapatalk 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.