Warped emulsion tubes? Anyone seen this before?

[work9to5]

Hey guys a friend dropped his bike off at my house this week cause it was running poorly. I pulled the carbs and found 3 of 4 of the emulsion tubes warped. I'm wondering what could've been the cause, have not seen something like this before. It's a 78 cb750 PD carbs. Bike was running ok...he drove it over here. Stumbled at more than half throttle, other wise everything seems fine. He said last time carbs where off bike was 3 years ago.

Any thoughts?


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[whynot]

yep.......over tightened......

 

[Kamn]

or needle jets werent seated properly before tightening the emulsion tube

 

[irk miller]

Maybe he hammered them in place instead of screwing them in.

 

[Kamn]

the threads would be messed up if he hammered them in

 

[frogman]

Maybe tried to hammer them out? ???

 

[Tune-A-Fish]

Maybe he hammered them in place instead of screwing them in.

I agree with this, people are relying on impacts way too much


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[Tune-A-Fish]

the threads would be messed up if he hammered them in

Maybe they're just old and limp LOL!


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[teazer]

It's pretty common, but rarely that bad. The thing is that they only screw in far enough to hold the needle jet in place and that leaves a lot of thread exposed. People assume they should be tightened some more and that's what happens. Surprised the threads didn't give out before that level of distortion.

 

[work9to5]

Thanks for the info


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[xb33bsa]

i was thinking carb full of water froze and the expansion dis-torted the tubes
i think the needle jet outlet nozzle deal had to be badly cocked, to get that bent..... butteye never seen that before its a miracle

 

[john83]

I found the same thing in my GL1000 carbs.