Hobbit Reed Block Gaskets

Steve Helmer ((Psyclomoteur Montreal) /

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

Re: Hobbit Reed Block Gaskets

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.

Re: Hobbit Reed Block Gaskets

Steve Helmer ((Psyclomoteur Montreal) /

Thanks,

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

I'll give the silicone a try.

Cheers

Steve

Re: Hobbit Reed Block Gaskets

treatland didn't have it?

Re: Hobbit Reed Block Gaskets

Steve Helmer ((Psyclomoteur Montreal) /

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.

Re: Hobbit Reed Block Gaskets

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.

Re: Hobbit Reed Block Gaskets

Julie the Wizard /

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?

Re: Hobbit Reed Block Gaskets

Downhill Harvey (OFMC) /

and not over-torquing the screws is also key to not getting air leaks.

That should have been in bold

and not over-torquing the screws is also key to not getting air leaks.

All engines have torque specs, do not exceed them.

Re: Hobbit Reed Block Gaskets

Steve Helmer ((Psyclomoteur Montreal) /

Thanks,

I'll try to source some thin paper.

Re: Hobbit Reed Block Gaskets

Cereal box makes a good gasket material in a pinch.

Re: Hobbit Reed Block Gaskets

A new dollar bill is the most durable and will not wear out or stick.

But I don't think you can find a new dollar Ha Ha.

Re: Hobbit Reed Block Gaskets

Emil Kniemel /

Re: Hobbit Reed Block Gaskets

I buy this in different thicknesses..and cut gaskets for everything I need....including my stock hobbit reeds :)

Had a little leak myself.

https://www.treatland.tv/195mm-x-475mm-sheet-of-amazingly-incredible-gasket-p/amazing-sheet-gasket-paper.htm

Pricey but it's a big sheet...and good to keep in the tool box

Re: Hobbit Reed Block Gaskets

Steve Helmer ((Psyclomoteur Montreal) /

Thanks fellas.

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