Hey all. I'm hoping to get some tips/opinions.
I have an 89 Polaris Indy Sport 340. Quick background is at the end of last year, as I was riding it all of a sudden had no power and died. I managed to get it started again and limped home with no power. That was the last chance I had to ride or investigate until this winter. This winter before startup I pulled the carbs off and cleaned them up. Everything looked good. I put it together and it would start but ran very poorly. I changed the plugs and then it ran well, except for one thing.
Now it will run fine until I get over 3/4 throttle, maybe even a little closer to full throttle, then it will bog down, power drops off. If I slow back down to under 3/4 it runs fine again. I will say that the bogging sounds different somehow from what it sounds like if it is flooding. Maybe a higher tone to it?
I'm thinking if it's just over 3/4 throttle, that points to main jets and when I cleaned the carbs they were fine, and I haven't changed any settings involving the needles or main jets.
Questions I have are:
1. Of course, any ideas on what this sounds like?
2. While cleaning the carbs I noticed that one pilot air jet was 1.5 turns out and the other was 1.25 turns out. I reset them both at 1.5 turns. If this is too lean, would it cause this problem. Should I set it to less turns?
3. I have been thinking I'll have to do a top end on this machine one of these years, but compression was still equal in both cylinders and was running well before. Would low compression cause this problem?
4. Can a bad clutch or clutch adjustment cause this?
Thanks so much for your help!
Happy Holidays
I have an 89 Polaris Indy Sport 340. Quick background is at the end of last year, as I was riding it all of a sudden had no power and died. I managed to get it started again and limped home with no power. That was the last chance I had to ride or investigate until this winter. This winter before startup I pulled the carbs off and cleaned them up. Everything looked good. I put it together and it would start but ran very poorly. I changed the plugs and then it ran well, except for one thing.
Now it will run fine until I get over 3/4 throttle, maybe even a little closer to full throttle, then it will bog down, power drops off. If I slow back down to under 3/4 it runs fine again. I will say that the bogging sounds different somehow from what it sounds like if it is flooding. Maybe a higher tone to it?
I'm thinking if it's just over 3/4 throttle, that points to main jets and when I cleaned the carbs they were fine, and I haven't changed any settings involving the needles or main jets.
Questions I have are:
1. Of course, any ideas on what this sounds like?
2. While cleaning the carbs I noticed that one pilot air jet was 1.5 turns out and the other was 1.25 turns out. I reset them both at 1.5 turns. If this is too lean, would it cause this problem. Should I set it to less turns?
3. I have been thinking I'll have to do a top end on this machine one of these years, but compression was still equal in both cylinders and was running well before. Would low compression cause this problem?
4. Can a bad clutch or clutch adjustment cause this?
Thanks so much for your help!
Happy Holidays
Bog at full throttle
