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SU Help, Please?

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HealeyRick

HealeyRick

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After cleaning up the original HS6 carbs (which have about 15,000 mi on them) on my BJ7, I'm having a problem I just can't seem to solve. Upon start up, the engine revs right to the redline. The throttle linkage appears adjusted correctly and when I check the butterflies after shutting down, they are completely closed. The throttle screws are completely backed off and the jet nuts have been turned down two turns. Any suggestions?

Thanks,
Rick
 
Not quite sure what your problem is Rick

Are you saying that the engine races away on start up without applying the throttle?

Or you can't get past the red line - unless your engine is properly balanced you do not want to do that anyway.
 
rick, does your gas pedal wook normaly, if not adjusted properly it is possible for a portion of the interconnect linkage to lock/get stuck over center in the full throtle position, if you look at your linkage closely and try to move it by hand youll notice how its spun to full open position, youll need to losen it all and re adjust/ reposition, ive mentioned this in the archives.
 
You may remember a couple of weeks ago I posted I was stumped by my BJ7 going to wide-open-throttle at start-up. All those who thought "throttle linkage", give yourself a pat on the back. It was actually Norman Nock who provided the best clue, when he said I couldn't get to WOT without the butterflies being opened. Sure enough, I checked again and the butterflies were opened a bit with the throttle closed. I disconnected all the linkage, but they still weren't closing all the way. Took the carbs off, separated the connecting linkage and the throttles closed completely. The aha! moment hit. Because I couldn't locate an original BJ7 throttle coupling shaft, I had to fab one up from two individual shafts, one which had a throttle stop, the other with the bellcrank. I connected the two with a flexible coupling spring. I was wary of cutting one of the coupling shafts too short so I made a number of cuts until I had a snug fit of the shaft between the two carbs. Problem was, it was too snug and was putting enough pressure on each throttle shaft to bind them up without allowing the butterflies to completely close. A little grinding off the end of one of the shafts and problem solved.

A special thanks to Ed, also, who offered a bunch of helpful suggestions and encouraged me to keep at it until I found the problem.

Happy Healeying,
Rick
 
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