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Odd problem

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Old Oct 26th, 2018, 17:34   #21
niveketak
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I think I may have identified the problem with the help of everyone on here. On Thursday the problem wasn't there as I had been just using light throttle (downhill in the main to where I was going) coming back heavier throttle kanagaroo juice again. Cleared after some lightish throttle. Tops off the float chamber and a bit of muck in the back one so tried cleaning it out in situ, seemed successful, but, problem now there all the time. I think some dirt is blocking the outlet to the jet so rather than just take them off and clean it out I have ordered new jets and needles from Burlen and will strip both down completely and give them a good clean out and then with the new jets and needles I am hopeful the problem will be cured. Thanks to everyone for the advice.
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Old Oct 27th, 2018, 21:02   #22
Ron Kwas
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nivetak;

Fuelbowls have a sump intended to be the last place for particulates to settle out and be captured rather than being presented to the Jet supply tube to be consumed...but if your sumps are full, then the might also be some restriction of the supply tubes occurring by debris which made it into the tube but for some reason does not pass...I have experienced this with bucking as the symptoms...I used carb cleaner with the snoozle tube into the Jet (in the reverse flow direction) to clear the partially blocked tube...

Good Hunting!
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Old Oct 28th, 2018, 19:31   #23
simonvolvo
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Sounds like a problem I had years ago. Very odd. Took me quite some time to figure out.

I restored a 122S (with twin SU’s) which had been sitting for many years (meaning: plenty of rust in the fuel tank).

The problem: a sudden (but only partial) loss of power when going up a long uphill. Not immediately, but some way into the uphill. I eventually tracked it down to a plug of consolidated, very fine rust powder which had formed at the bottom of the jet tube of one of the carbs. The plug had a hole in it formed by the metering needle when at rest. I assume the plug had broken loose at some stage and was able to move up and down the tube. Under normal driving conditions the plug was sitting at the bottom of the tube and enough fuel could get past. With increased flow, however, the plug moved up the tube, blocked the flow, and effectively put the one carb out of action. I discovered this by having the carbs on my workbench and blowing into the end of the flexible tube that is normally connected to the fuel bowl. Blowing gently, air was going through. Blowing harder, however, suddenly blocked the flow.

Cleaned out the jet tubes. End of problem.
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Old Oct 29th, 2018, 08:18   #24
niveketak
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Thanks Simon, just waiting for the jets arrival and all will be cleaned out and hopefully the problem solved.
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Old Oct 29th, 2018, 13:26   #25
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I guess my question is "why did you feel the need to order new jets and needles?" It isn't like these parts exactly wear out. I might have just ordered the carb rebuild kit (mostly seals and gaskets) and just rebuilt the things, cleaning the jets and needles with carb cleaner.
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Old Oct 29th, 2018, 16:45   #26
niveketak
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Quote:
Originally Posted by blueosprey90 View Post
I guess my question is "why did you feel the need to order new jets and needles?" It isn't like these parts exactly wear out. I might have just ordered the carb rebuild kit (mostly seals and gaskets) and just rebuilt the things, cleaning the jets and needles with carb cleaner.
Because there are ridges on both needles, not bad ones but they may as well be changed as the carbs are off and I needed gaskets anyway. My choice I suppose.
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Old Oct 29th, 2018, 19:54   #27
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OK
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