andy.262
Active Member
I've got a 99 GTX Limited with a brand new SBT engine that will not idle, cannot reach max RPM, and is backfiring out the exhaust. After installing the new engine, I did the break-in procedure painstakingly correctly (followed SBT's break-in procedures EXACTLY). It worked totally fine for the entire break-in and for about half a tank of gas after. Then it started randomly stalling, but would start back up fine and work fine for a while. Then yesterday it stalled, and now can no longer idle. It will start on the trailer (haven't tried in the water), but will immediately die when I let off the throttle. At the same time as this started happening, it now backfires through the exhaust.
Things I've tried/checked:
- have spark on both cylinders
- cleaned carb fuel filters (carbs were rebuilt 2 seasons ago, genuine Mikuni parts, followed the sticky, have been fine since then)
- cleaned filter inside the water separator
- bypassed the fuel selector (didn't make a difference either way)
- there was a little bit of water in the bottom of the airbox when I removed it, not sure if that's relevant or not
- EDIT: checked reeds shortly after posting, they look to be fine - not cracked or bent, no light coming through when held up
I'm confused as to how this just randomly started happening after being completely fine during the whole engine break-in period. Any ideas on what I should check next?
Things I've tried/checked:
- have spark on both cylinders
- cleaned carb fuel filters (carbs were rebuilt 2 seasons ago, genuine Mikuni parts, followed the sticky, have been fine since then)
- cleaned filter inside the water separator
- bypassed the fuel selector (didn't make a difference either way)
- there was a little bit of water in the bottom of the airbox when I removed it, not sure if that's relevant or not
- EDIT: checked reeds shortly after posting, they look to be fine - not cracked or bent, no light coming through when held up
I'm confused as to how this just randomly started happening after being completely fine during the whole engine break-in period. Any ideas on what I should check next?
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