Gaskets for rubber carb holders.

[eltoroloco]

Those intake manifold, carb holders, whatever they are. Partsnmore.net sells them with a set of gaskets. Last year i bought the manifolds from a yamaha dealer but i didnt know i might need the gaskets.

I did a little test where i sprayed some carb cleaner around where the manifolds meet the engine and the idle speed increased.

Should i install some gaskets or is there somthing else?

[mixelpix]

I would definitely put a gsket between them and the engine. You can cut your own pretty easily, or they can be purchased to spec at partsnmore, xtremesports, bikebandit, mikes, merriam cycles, and such. Just make sure you clean off any old gasket material from the intake ports on the cylinder head prior to installation. I like to smear a little bit of engine oil on the gaskets before putting them on (also a good idea for filters prior to install)

Finally, the test you described sounds good in theory, but I have found that aerosol cans of carb cleaner are not the best for this test - even using a nozzle or spout, it's too hard to control the spray. If you can, a better way to perform this test would be to find a container you can use to pour the carb cleaner, fuel or whatever, over the area in question. Also, make sure you have a good way of collecting the runoff. Honestly, though, it is too hard to control the spill, fumes, runoff, spray... The only time I have ever had a workspace catch on fire was while trying this kind of test. . .

Get some gaskets.

-pdk

[TopCatGr58]

Another option is just to put some sealer against the mating surface, one that can stand up to heat! Like RTV, Yamabond, Non hardening gasket sealer, high temp copper, etc.!! Just give it time to cure/seal!! I reckon oil on the gasket would help it to swell and seal, but I would think would eventually burn off after a while!? I'd rather use gasket sealant on a gasket! YMMV.
T.C.

[skids]

Call me superstitious if you like, but I wouldn't use any sealer on those gaskets. It is a risky thing to have heat and gas vapors causing that stuff to deposit on the valves. Try the gaskets dry or with a thin film of oil. Do not overtighten the manifold boots.

Originally posted by TopCatGr58
Another option is just to put some sealer against the mating surface, one that can stand up to heat! Like RTV, Yamabond, Non hardening gasket sealer, high temp copper, etc.!! Just give it time to cure/seal!! I reckon oil on the gasket would help it to swell and seal, but I would think would eventually burn off after a while!? I'd rather use gasket sealant on a gasket! YMMV.
T.C.

[eltoroloco]

Great advice, I think i'll just get some gasket material and cut 'em out myself. its not really a major problem, but hey, i'm told its all in the details.

Thanks evryone.

[RS Thornton]

Any suggestion for material to cut them out of? I have a few sheet of gasket material, some is for listed for valve covers on cars.

[XSiveForce]

From what I understand, your not supposed to put any kind of sealer on carb gaskets, If they leak, then they need to be replaced. I usually tighten the bolts for the intake manifolds, a little at a time, and do it in steps. Don't tighten one side fully, then the other. Tighten each side a little at a time, and keep switching till you get it correctly torqued. It assures an even seal, and therefore you dont need sealer. But just mho. ...

Bobby

[RS Thornton]

I got a set of carb holders for the 79 special and it had gaskets included. Somehow I managed to loose 1 of the 4 gaskets between the time I got them and now when I am ready to get the work done. I planned to cut a 4th gasket to make up for the one I lost.

[Pat Kelly]

When I got my 4 there were Gaskets and O-rings. I didn't use the gaskets and still no leaks after 3 years of daily use.