Hobbit Reed Block Gaskets

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Hobbit Reed Block Gaskets

Steve Helmer ((Psyclomoteur Montreal) /

Jul 19, 2014 07:00PM

Hi folks,

My 1981 PA50II started running all messed up, runs fine on the stand but loses power when ridden.

I found an air leak either between the case/reed block or reed block/intake, too close to tell. I took it all apart and cleaned all the surfaces and put it back together and still have an air leak.

The o-rings as well as the square rubber gasket on the bottom of the reed block seem pretty squished, like flush to their adjacent flat metal surfaces. They're clearly not doing their job.

I can't find these gaskets for sale from the usual suspects.

What's the consensus on using a silicone gasket maker like Ultra Grey Moto or something else in this application?

Leaving the crappy gaskets in place and applying a skim coat of silicone?

Thanks for any help.

Steve

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Re: Hobbit Reed Block Gaskets

Ryan . /

ihazvalves

Jul 19, 2014 07:08PM

The reed block is rubber coated and has no gasket. That being said, use what you have to. I have rtv sealing an intake adapter and has been for quite a while, but it is exposed to less heat.

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Re: Hobbit Reed Block Gaskets

Steve Helmer ((Psyclomoteur Montreal) /

tapedeck74

Jul 19, 2014 07:11PM

Thanks,

So I would need a new reed block to get a new gasket surface..

I'll give the silicone a try.

Cheers

Steve

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Re: Hobbit Reed Block Gaskets

Steve Clark /

anybody

Jul 19, 2014 07:40PM

treatland didn't have it?

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Re: Hobbit Reed Block Gaskets

Steve Helmer ((Psyclomoteur Montreal) /

tapedeck74

Jul 19, 2014 08:51PM

I think they may have the whole reed block for $25 or so, but I'm in Canada and with shipping it'll come to something like $50 with shipping. I'll try the RVT.

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Re: Hobbit Reed Block Gaskets

cheetahchrome . /

cheetahchrome

Jul 19, 2014 11:17PM

I too had this same problem with a old block. I avoid using sticky goos mainly because I hate to clean that shit when doing maintainance.

I made two matching gaskets out of thin but durable gasket paper then colored all sides with graphite to avoid sticking to the case and block.

Worked great, also used studs and nuts.

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Re: Hobbit Reed Block Gaskets

Julie the Wizard /

muse

Jul 19, 2014 11:35PM

Cheetah is smart.

I would have done what he did but I'm not intelligent.

Lapping the mounting surface of the reed block might help. and not over-torquing the screws is also key to not getting air leaks. I'm probably alone in this, but I put a little two stroke oil between the seals, too.

Nominal torque is like 90-120kg/cm, I think?

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