ive got a 1981 gs750 dont know anything about it besides the secondary jet on one of the carbs is compltly stripped oout. ive tried everything and cant get it so im just going to buy a new/used one and i have no clue what carbs are on it. thank you so much.
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By "secondary jet" , do you mean the pilot jet that resides in a tunnel next to main jet ? or do you mean the idle/air mixture screw that is on carb outlet (engine side) ?? As you found out (and many others too), you need to find/modify a screwdriver whose blade fits perfectly into these jets/screws or you will strip it easily. is this your situation?1981 gs650L
"We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin -
Yea it the pilot jet. And it is very stripped and very stuck in thereComment
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When you get your "mega welcome", there's a link in it to the carb rebuild tutorials. A little fishing around with the search feature should help you figure out which carbs are present on your bike. good luck
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I was in the same boat as you and had to buy a new set of carbs to get a spare. I tried to drill it out and destroyed it. FYI your bike has mikuni BS32 carbs if they are the CV style.Comment
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Well, ya got nothing to lose by trying to remove it, if you're planning to replace the carb anyway...
My system is this: mix up a small batch of 50/50 ATF & acetone - best penetrating oil mix I've used - and start soaking the jet. Give it a couple of days to soak, then try to file/scratch the slot back into the head of the jet by using the end of a small rat tail file. The jet is made of pretty soft brass material & you'll be surprised at how deep a slot you can make. Get the carb securely mounted in a vise & use a impact driverto try & loosen it up. You may have to find/grind a driver head to fit down that small access dia, but this works most of the time.
For very stubborn jets, I drill a hole down the jet center (don't hit the alum threads, best to drill this with a drill press), and then hammer a "slightly larger" diameter torx bit down the hole to bite into the brass jet. Put a socket handle on the bit & heat the outside area of the tunnel with a propane torch, while slowly trying to break the jet free.Last edited by Guest; 02-23-2014, 08:11 AM.Comment
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This is the one time I use easy outs. Not hard to center an existing hole.
Be careful not to hit the threads as Mr. Hiker said.Comment
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Consider a left handed drill bit before the ez out-ez outs are brittle and if you bend them while turning, you got bigger problems. The left handed drill will bite into the jet's hole, grab onto it, and usually spin it out.1981 gs650L
"We are all born ignorant, but you have to work hard to stay stupid" Ben FranklinComment
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You guys realize how small that hole the jet is in is and how deep it is? No file and no torx bit is going to fit in there.Comment
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Drill for easy out.
Install easy out but don't let it bite too hard.
Heat the area with a propane torch.
Then remove pilot jet.
Not my first rodeo.Comment
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I have done this several times so yes, I realize exactly how small & deep it is...
When trying to re-establish the stripped off slot, I use the hardened tip of the file to scrape/scratch the damaged slot deeper - it takes a little time but eventually you will carve a new slot the impact driver bit can catch on.
If that fails, then I have a small torx bit screwdriver (I'll have to find it & see what the size is) that fits down there perfectly. I pound it into the drilled jet & then heat the area outside the threads with a propane torch, keeping it wet with penetrating oil. If you take your time & get the jet to break free, you can slowly turn the jet back & forth until it threads out - patience is the key.
I also have a tap for those pilot threads that I use to chase/clean up the threads in the carb body.Last edited by Guest; 02-24-2014, 05:13 PM.Comment
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Wow. I stand corrected! Looks like I'm gonna have to add a few more special tools to my box. Thanks Hikermikem.Comment
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http://www.harborfreight.com/6-piece...set-94757.html
This is an example of what I use as an "easy-out".
I drill a hole down the jet C/L using a bit smaller than the torx bit - I do this using my drill press to make sure the hole is straight. Then I pound the hardened steel torx bit down into the drilled hole. Works like a charm, if your driver set has a flat or hex somewhere on the shank, then you can put a wrench on it for more leverage. The key is the torch - heat the carb body on the outside to expand the hole so the jet will break free. May take a cycles...Comment
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[QUOTE=hikermikem;2007692]http://www.harborfreight.com/6-piece...set-94757.html
This is an example of what I use as an "easy-out".
Oh yeah, I haven't seen the long ones like that. And Harbor Freight has them, excellent!
Thanks again.
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