Yes, you have air leaks. Carbs not balanced properly due to the air leak. Assuming the inlet is pretty tight to the cylinder head...fit gaskets beetween manifold, spacer, heatshield and carbs and smear some sealant on gasket faces.
Lack Of Top End Power, 1275
Started by
Keith Grendahl
, Oct 01 2012 02:13 AM
18 replies to this topic
#17
Keith Grendahl
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- Noobies
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- 89 posts
Stage One Kit Fitted
Posted 07 October 2012 - 06:48 PM
Sorted. Removed offending carb to find the jet obstructed where it meets the bowl. Seems someone (me) didn't remove the old rubber gasket and washer when installing the new jet. Old gasket was deteriorated and blocking the end of the tube. Took over a year for it to impact flow enough to notice.
Runs right up to 75 mph, cruising at 70. Thanks for talking me through this issue.
Keith
Runs right up to 75 mph, cruising at 70. Thanks for talking me through this issue.
Keith
#18
Earwax
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- TMF+ Member
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- 489 posts
Speeding Along Now
- Location: Brisbane
Posted 08 October 2012 - 07:35 AM
good result keith - took swome time but not a lot of money - you gotta be happy with that - good cruisin
#19
carbon
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- Members
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- 2,590 posts
Up Into Fourth
- Location: UK
Posted 08 October 2012 - 06:36 PM
You did well to find that one! I had a similar problem with a HS4 single carb set-up. Could not even get it started, really stumped as the carb float chamber had plenty of petrol in it...
Finally realised that the petrol was not getting through to the jet, and then found that the rubber washer on the float chamber end had deteriorated and swelled to a point where it was blocking the end of the inlet.
Finally realised that the petrol was not getting through to the jet, and then found that the rubber washer on the float chamber end had deteriorated and swelled to a point where it was blocking the end of the inlet.
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