Strange Problem at Highway Speed
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Extreme HDF Member
Joined: Jul 2015
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From: Edmond, OK
Originally Posted by splattttttt
Its s drag pipe
maybe find a way to balance it with gearing
maybe find a way to balance it with gearing
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Extreme HDF Member
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From: Edmond, OK
So I think the .76 main and .31 intermediate was the ticket. At high RPM this bike is screaming. The only time I was able to get it to stutter was cruising in high gear and then going full throttle without downshifting.
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Extreme HDF Member
Joined: Jul 2015
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From: Edmond, OK
Back to the drawing board. Still cutting out. Now it started happening under acceleration from slow speed. Judging by black smoke when choking I am way to rich. Bought a rebuild kit for the carb, new backing plate as the old ones mounting tab was broke at the breather bolt. Also ordered a conversion kit to convert older style rebreather system to new style. Any other suggestions?
Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
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From: Haslet Texas
Back to the drawing board. Still cutting out. Now it started happening under acceleration from slow speed. Judging by black smoke when choking I am way to rich. Bought a rebuild kit for the carb, new backing plate as the old ones mounting tab was broke at the breather bolt. Also ordered a conversion kit to convert older style rebreather system to new style. Any other suggestions?
A healthy 80" will give you something like 160 psi.
If you have something bigger you will get something like 180 or 200ish psi.
If you have to run a 31 and 76 on an 80" motor then you are masking another problem.
Not sure what it is but no 80" needs a 31 or 76 to run correctly.
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Extreme HDF Member
Joined: Jul 2015
Posts: 12,499
Likes: 7,511
From: Edmond, OK
Originally Posted by texashillcountry
Do a compression test.
A healthy 80" will give you something like 160 psi.
If you have something bigger you will get something like 180 or 200ish psi.
If you have to run a 31 and 76 on an 80" motor then you are masking another problem.
Not sure what it is but no 80" needs a 31 or 76 to run correctly.
A healthy 80" will give you something like 160 psi.
If you have something bigger you will get something like 180 or 200ish psi.
If you have to run a 31 and 76 on an 80" motor then you are masking another problem.
Not sure what it is but no 80" needs a 31 or 76 to run correctly.
Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
Yeah I don't think the jets helped. Gonna pop the original jets back in or even the leaner ones you originally suggested. Give the carb a good cleaning and change out all the gaskets. Will try to borrow gauge to do compression check. Could an intake leak possibly cause it?
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