Just abit of an update thought i would let you guys know i went to the mechanic that i take my ute to told him what was happening and showed him the gasket he reckons that its either a bad batch of fuel or because its premium fuel that therefore it its pretty much cleaning out all the gunk sitting in my tank and maybe blocked one of the jets of something as for the gasket he said its rare to suck in a gasket but reckons it did it because of the extreme backfiring its been doing which sucked it in. its booked in next Tuesday so he can have a better look.

Thanks

okk thanks for all the information i think im just going to take it to my mechanic and see what he says i still reckon it has something to do with the fuel but anyway hopefully he will know..

Thanks

Second Rc the 32/36 rattle apart easy :)

in my experience this sort of thing is typical of weber carburettors, a full rebuilt and professionally tuned weber can only be expect to work well for 6 months before issues with gaskets, loose screws and jets, falling out of tune and cracked diaphragms.. had this many many times over the years

best option is the GX style SU's

How the hell the gasket do that?

I ran 98 when I ran petrol. Tuned for it and I always had issues with ulp and 95.

In theory they all have different flow properties and in.carby cars thus can.cause issues. Same but not as bad in efi cars. Injector spray etc.

Fix gasket check why secondaries not working, and retune.

bump...any ideas on what it could be??

okk then fair enough anyway the main reason i used the premium fuel was for fuel economy..Anyway so i decided to take off the air filter and have a look and what i found was what looks like a gasket been sucked in?? and also on full throttle the secondary jet is not letting in any fuel could this be the reason of why it is bogging down? ill add some photos of the gasket?

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High octane fuel is not richer. It still uses the exact same jets as regular octane fuel. The only thing high octane means is more knock resistance, hence potentially can take more spark advance.

It's not generally cleaner either (does not have more cleaning additives). But if the fuel station puts one or the other in comtaminated tanks it will be a problem.

The reason for "running bad and bogging down, hard to start, and really back firey" is most commonly caused by clogged jets. Easy to clean with a Hitachi, but more tricky with a weber. You have to remove the Weber, remove the top and dump the fuel out and spray the passages. Or you could try this: leave the weber on the engine, remove the top and suck out the existing fuel with a cooking baster. Then remove the jets and suck the passages below the jets too.

yehh rightoo..Could it be that cause the jets in my carby are already too big but it was running fine as it was tuned on 91 fuel that now cause its getting more richer and cleaner fuel that it cant handle it hence the reason of why its running bad and bogging down, hard to start, and really back firey??

High octane fuel requires the exact same air/fuel ratio, hence the same jetting as regular octane fuel.