deckheight Posted January 13, 2009 Report Posted January 13, 2009 Had to be Oregon didn't it LOL! Very interesting way of tuning a "hill shooter", IMHO anyway... There is really no reason to tune a motor that close to the edge for recreation type riding and I suspect there is probably more going on there than just jetting anyway. If it were just jetting or an air leak I would have expected to see the thing detonation seize before the piston vented. Besides all the usual stuff, might consider establishing an accurate CCR/fuel octane requirement, check crank phase as well as CDI function. Would defenitely consider backing off the ignition timing, possibly stagger main jetting and might even consider staggering the compression ratio, depending... Good luck So - What cause the lean condition - that's a good question. I'd like to bounce this off you all. A guy I trust at a shop in Oregon took one look at my piston and was able to tell me exactly what I was doing when it blew. He said, "oh, interesting - found the flats did ya, I hope you won." Huh, I replied. He then said, "yeah, you can't do that. Banshees like the hills. If you're going to drag race, hit the top and let off. Don't keep running or you'll lean it out - sometimes as much as two jet sizes." Well, that's exactly what I did. I was drag racing on the flats, and basically kept it open for a while after I hit the top of top. I'd back off for a second at a time, but then I'd get back into it. I guess that's a bad thing. Does this track with what you all know? or should I look for addtional causes of the leaning? Quote
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