Topic: Stuck carb slides

[70cbk0]

Hi guys. I've got 4 stuck carb slides in the early
Cb750 k0 with the 4 separate cables. So I can't get the carbs out of the bike. I'm thinking of soaking all the carbs in a pan with something. Diesel fuel? Varsol? I don't think it's seriously corroded or anything. Maybe just gas that's turned to lacquer. Advice? Thanks, John.

[70cbk0]

P.s. the bike's new to me, and I don't think it's been running in 20 years.

[ekpent]

Try a good quality heat gun on the carb bodies to soften the varnish.Some oil or other material that is not super flammable will also help with the Heat.

[jason41987]

three of my carbs were frozen as well.. i sprayed some PB blaster into them, let it set, and it unfroze all of them.. im not sure how PB blaster works on o-rings, but they all needed to be replaced anyway

[70cbk0]

Yeah, I've had them soaking in PB for a while. No luck.

[Mo]

When mine were stuck I just too a set of pliers on the throttle arms for leverage and unstuck them that way.

[TwoTired]

A heat gun is the least damaging cure for stuck slides that I have found.

[70CB750]

Mine was the ssme way including 1-4 cables that were frozen. I used wire cutters to get carbs out, the cable is likely not worth salvaging.

Once it is out, you can free them one at a time.

[70cbk0]

thanks guys

[70cbk0]

Ok, got all 4 out this morning. The heat gun did the trick. And my cable is still fine! I thought the cable was seized too, but it's good. Thanks guys, I never would have thought of using the heat gun.

[jason41987]

ive always relied on penetration lubricants like PB blaster and WD-40.. but there are just some things it absolutely will not work on.. never really tried heat before but i was having an impossible time getting the drain screw out of my bowl cover... took a blow torch to the screw for a shorter period of time and i was able to take it right out

so... when all else fails, ive learned how much of a best friend a litlte heat can be

[trueblue]

For future reference acetone removes old petrol varnish in nothing flat and is great for freeing stuck slides

[Dimitri13]

ive always relied on penetration lubricants like PB blaster and WD-40.. but there are just some things it absolutely will not work on.. never really tried heat before but i was having an impossible time getting the drain screw out of my bowl cover... took a blow torch to the screw for a shorter period of time and i was able to take it right out

so... when all else fails, ive learned how much of a best friend a litlte heat can be

PB Blaster and the like are penetrating fluids. WD-40 is a lubricant.

[fastbroshi]

Did the slides look like they were corroded or was it just varnish?  It would good to know as rare as those carbs are, and as hard as throttle valves are to find. 

[ekpent]

The slides can become varnished and sticky adding to the problem of frozen carbs but another area also to address is the metering rod that goes into the main jet.On badly varnished carbs it gets glued in there also.

[70cbk0]

The slides are perfect. No corrosion. But yes, the needle jet was likely stuck too. It's very gummy. Somebody obviously left the fuel bowls full.

[Bailgang]

The carbs on my 550 were froze from varnish so bad that both the slides and the floats were froze. I ended up tossing the carbs in a pan of boiling water to get everything to loosen up. I have a very understanding wife.