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1978 GS750E hesitates just off idle

Himble

Himble

Forum Apprentice
I think this issue has already been discussed but I can't find a definitive answer.
My 750E, once warmed up runs fine to redline, but when I stop at lights or stop sign (idle is normal at ~1100rpm) and then open the throttle to take off, there is a slght hesitation before it picks up. This also happens when I change down to 1st (or 2nd) when going round a corner before opening the throttle again.
The bike is stock, however where the breather pipe connects into the airbox, there's just a hole. Not a big one, just a bit larger than than the pipe/hose. In an earlier life, it seems the entry point was broken off.

I'm not going to play with anything until I get advice/suggestions from all you experienced gurus on this forum! If you need more info to help, let me know and I'll try my best!

Cheers
Andy
 
Try covering the hole with tape and see if it makes a difference. These bikes are very finicky where air is involved. The amount and flow of air is VERY important. You may be getting too much air!
 
Could be low float height and or mixture related, since it's runs well elsewhere on the throttle band I'd start there. As for the breather, get a filter on the end and plug up the hole to the airbox.
 
I agree it sounds like a fuel problem possibly lean condition due to the hole or dirty pilot jet causing it to be lean at low rpm? Here is my ridiculous notes from my 1978 build I sold last year. Doubt it will help but you never know.

e3C3GrVl.jpg


fzH90iEl.jpg


cmUzBuel.jpg
 
A few yrs. back, my buddy & I went to look at a "99" Bandit 1200, he was interested in buying, it was doing just what you're describing + while just riding at 40 or 50 mph & crank the throttle, it would sputter once then run fine. My Buddy declined to buy it. The following week I contacted the seller & we worked a deal & I bought it. Removed the carbs, & found a little point poking up in the throat of one of the carbs. I think it's called the idle adj. screw had been screwed in tight enough the point had broken off. Got the little point out, installed a new one, got it adjusted right & all is great no stumbles, coughs, no nothing at any throttle position. Now mine were CV carbs & yours are VM's, may be different, but maybe may help. Dang that's a clean looking bike you've got there. congrats.
 
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