Carb help needed

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delling3
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Carb help needed

#1

Post by delling3 »

So, some of you have seen my current project - a Yamaha XS750 barn find. I am rebuilding the carbs at the moment, and hit a bit of a snag. Mikuni carbs (not the same as the Goldwings - has the rubber diaprhams) with the choke lever mounted on the side of the carbs instead on on the handlebars. While disassembling the carb rack, one of the screws holding the lever to the carb body broke off. Most of the screw is still in the body, but it is below flush - probably 2 mm or so below the face of the screw boss. It's a tiny little machine screw - maybe 2mm diameter. Any thoughts on how to extract?

Thanks.
delling3

1979 Yamaha XS750SF

Previous:
1978 GL1000 - JUNE 2017 BOTM: Sold
2006 Kawasaki Concours: Sold
1995 Kawasaki Concours: Crashed/totalled.
1976 GL1000: LAST RESTORATION, sold
1981 Honda CB900F Supersport: 3rd restoration, sold.
1979 Yamaha XS-750F: 2nd restoration, sold.
1982 Honda FT-500 Ascot: First (only) new bike. Family forces sale.
1973 CB500 Four: First restoration, long gone.
1972 Suzuki TS-100: First bike, sold.

Only dead fish go with the flow . . .
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pidjones
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Re: Carb help needed

#2

Post by pidjones »

Not really, but Mikuni parts and full carbs are fairly plentiful. BTW, on a Mikuni, it is more of an "enricher" than a choke (even though the lever indeed says CHOKE). It adds fuel in from the float bowl through its own jet instead of choking air flow to the carb allowing intake vacuum to pull a richer mixture. Both perform about equally, though. I have GL1000 with choke and RD400c with enrichers. Different ways to get a rich mixture while cold. Whether you fix your lever pivot or not, make sure the piston seals well when it is at the bottom (off).
"Love 'em all.... let God sort 'em out!"
Ex 2006 GL1800 - the Black Pearl SOLD! to make room for:
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1975 Red GL1000 project - ex Pistol Pete project
1972 Triumph T150V Trident rescue - finished and FOR SALE!
1976 Yamaha RD400c
1978 GL1000 with '75 engine - the Hunley
Ex 1978 GL1000
Ex 1979 GL1000
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kerryb
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Re: Carb help needed

#3

Post by kerryb »

If this were my problem to solve, I would start with penetrating oil and heat from a small propane torch on the carb body near the screw. Heat up pretty good to get the oil to penetrate ( the carb body will expand faster than the screw) then with a fine point punch put a dent dead center on the broken screw. Then with more heat on the carb body, use a left hand drill bit a little smaller than the screw in a battery hand drill on low speed with oil to cool the bit. You might get lucky! I have in the past...not always.
intrigued by the wail...seduced by the scream.
'78 cb750K, '83 GL1100s,I,&A,'08FXSTC, '79 WilMac trike
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