RaWarrior
Well-Known Member
I've got this little problem with my '97 that kind of comes and goes on a pretty random basis.
At highway speeds(say 55 and up), sometimes the throttle acts like it hits a "dead spot" when I go to roll on the gas. To put it another way, slight increases in throttle have virtually no effect. If I continue to slowly roll on, by maybe half-2/3 throttle all of a sudden it takes off and runs fine. Getting the RPMs up doesn't seem to make much of a difference, I can be cruising at 90 and get the same "lag". Past 6k with vboost, it seems to stop, and if I switch the t-boost to 3k(to open the valves), that usually clears it up. When the "lag" occurs, it almost feels like one cylinder is not firing.
The p/o installed a Stage 1 kit, and a K&N filter. Stock headers, holeshot s/o's. Nology coils, NGK wires/caps, and NGK Iridium plugs.
I've tried both the peashooter and shotgun...neither seemed to make much of a difference. However, when I drained the bowls a relatively large amount of water came out of one carb bowl...the other 3 were fine. It was the right-rear carb. Checking the plugs, they all look the same. To my eye they seemed maybe a teensy bit lean, there was just a "hint" of tan color on the insulator. Otherwise the bike runs awesome. Smooth steady idle, no starting problems, loads of power. Never overheats, or even comes close to the red zone on the temp. With the fan running it NEVER goes past half way on the temp gauge.
I've tried using sea-foam, the blue sta-bil, and other fuel additives with fill-ups. Since the problem is intermittent, it's difficult to tell if a period with no lag is from the additive or just chance. Note: all gas around here is E10. The marina where I work recently got ethanol-free gas, so I'll try running that to see if it makes a difference.
Since the shotgun, it seems to maybe have gotten better.....subjectively it happens less often and the "lag" isn't as pronounced.
Eagle recently had his carbs redone, and mentioned that he had a "stumble" between 4-6k....similar to my problem. He said that adding one washer to the needles solved it. I'm not so good with CV type carbs, so correct me if I'm wrong, but adding a washer would "lift" the needle a bit more, and make the bike a bit richer? That could explain the lean looking plugs, and why activating v-boost clears the issue up. A lean midrange? Last question: where would I get washers for the needles to try this?
At highway speeds(say 55 and up), sometimes the throttle acts like it hits a "dead spot" when I go to roll on the gas. To put it another way, slight increases in throttle have virtually no effect. If I continue to slowly roll on, by maybe half-2/3 throttle all of a sudden it takes off and runs fine. Getting the RPMs up doesn't seem to make much of a difference, I can be cruising at 90 and get the same "lag". Past 6k with vboost, it seems to stop, and if I switch the t-boost to 3k(to open the valves), that usually clears it up. When the "lag" occurs, it almost feels like one cylinder is not firing.
The p/o installed a Stage 1 kit, and a K&N filter. Stock headers, holeshot s/o's. Nology coils, NGK wires/caps, and NGK Iridium plugs.
I've tried both the peashooter and shotgun...neither seemed to make much of a difference. However, when I drained the bowls a relatively large amount of water came out of one carb bowl...the other 3 were fine. It was the right-rear carb. Checking the plugs, they all look the same. To my eye they seemed maybe a teensy bit lean, there was just a "hint" of tan color on the insulator. Otherwise the bike runs awesome. Smooth steady idle, no starting problems, loads of power. Never overheats, or even comes close to the red zone on the temp. With the fan running it NEVER goes past half way on the temp gauge.
I've tried using sea-foam, the blue sta-bil, and other fuel additives with fill-ups. Since the problem is intermittent, it's difficult to tell if a period with no lag is from the additive or just chance. Note: all gas around here is E10. The marina where I work recently got ethanol-free gas, so I'll try running that to see if it makes a difference.
Since the shotgun, it seems to maybe have gotten better.....subjectively it happens less often and the "lag" isn't as pronounced.
Eagle recently had his carbs redone, and mentioned that he had a "stumble" between 4-6k....similar to my problem. He said that adding one washer to the needles solved it. I'm not so good with CV type carbs, so correct me if I'm wrong, but adding a washer would "lift" the needle a bit more, and make the bike a bit richer? That could explain the lean looking plugs, and why activating v-boost clears the issue up. A lean midrange? Last question: where would I get washers for the needles to try this?
