Author Topic: GTR Carbs Not Functioning  (Read 241 times)

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Offline davis

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GTR Carbs Not Functioning
« on: September 10, 2021, 08:56:53 AM »
Greetings all,
I am stumped on a real anomaly here. I completely disassembled my engine to solve three issues: low compression, oil leaks, and uncontrolled richness. After careful reassembly the first two were solved but the third ends up with carbs that essentially aren't working - no, or little, fuel being delivered to both combustion chambers. Although not dirty, both were disassembled, ultra sonic cleaned, and air blasted. Floats were reset and fuel delivery from the tank confirmed. The the engine will not start and no fuel is seen on the plugs or smelled in the spark plug holes or the end of the muffler. The only change made from the prior good running engine was inserting Moonpup's choke pads with new choke return springs. (A shout-out for his generosity). Choke function seems fine. I taped the carb inputs to encourage fuel delivery, which gave a backfire that blew the tapes off. Apparently enough fuel was delivered to give lean burn backfires(?) Any help would be appreciated since the season is drawing to a close and I would like a ride this year. I will keep you posted as to progress. Thanks - Bob

Offline BRT-GTR

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Re: GTR Carbs Not Functioning
« Reply #1 on: September 11, 2021, 03:03:45 PM »
   Hi Bob,
               Sounds like you sorted the uncontrolled richness, as well.  lol.

          Ok,  No fuel to cylinders - 1st thought - Disc valves 180 degs out, easy check, valves should be open at TDC, just about to close,  when viewed through the carbs.
      Beyond that, sticking float or float valve, although, unlikely to be both sides. Let us know what you find.
    Good luck,   Brian.
« Last Edit: September 11, 2021, 03:09:49 PM by BRT-GTR »
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I'm so glad I grew up in the 60s & 70s. I did so much stupid stuff and there's no record of it.............Anywhere !!

Offline davis

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Re: GTR Carbs Not Functioning
« Reply #2 on: September 12, 2021, 03:54:30 PM »
Picture shows T.D.C. on the left side with c.c.w. valve rotation. Thanks for your input Brian.

Cheers, Bob

 


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