LCGB Forums

Hello - I am replacing my air filter to carb hose as I'm fitting a 22mm Jetex - is there a hose available that has the breather valve - like my 18mm S3 hose which just won't stretch
all i can find is the single piece GP style hose.

Thanks - Andrew

They didn't make a GP 22mm hose with a valve,I dont know if you can buy an after market one.

I'm not sure how effective those drain pipes could have been anyway.

Thanks. Would I be right in thinking most folks just fit a GP style rubber hose on then? That's if they still use the filter box and don't just wang a stand-alone filter on (which would be overkill on my Gori replica 175 TV conversion barrel tbh). I guess they were there for spit-back, possibly a bit of over-engineering? I'm all for simplicity.

Andrew

I have 2 scooters running 22mm jetex carbs with standard GP hoses through the airbox and they run just fine.

Thank you Paul. (and TBG)

I've seen a workaround using an old cable adjuster, you cut off the bit where the cable ferrule would fit so you're just left with the a flat plate and you use the lock nut to secure it to the rubber.

I've never been able to find a supplier of these. I believe the very early GPs had them fitted and some early GP fan cowls include a bracket to secure the drain pipe - mine does but it wasn't supplied with a drain valve type hose.

I get a bit of spit-back in the hose elbow and I've always suspected this to be the cause of occasional poor hot starting.

Here's a picture of one in the Innocenti GP150 owner's manual:

^^ I always wondered what that bracket was on my flywheel cowling

I suppose the truth of the matter is that it made things cheaper and easier to manufacture. The GP was probably designed as a cost saving exercise.

Rimini Lambretta had NOS of these a while back.

The common sealed type are fine and don't cause issue.

(which would be overkill on my Gori replica 175 TV conversion barrel tbh).
Andy,
My 200cc Gori kitted TV175 has opperated thro' a hollowed out airbox with both a 25mm Jetex then 26mm rnd slide Dellorto with a GP's 22mm air hose.
cheers, Mike

Thanks Hullygully.
I am quite excited about the Gori replica 175 kit (S3 125 gearbox with a 17t front sprocket).
The engine's being rebuilt now; should be fine for quotidien usage.

A few people have suggested ways of fitting a 'leak pipe' to a standard 22mm air hose; but then it wouldn't have a one way valve and air would by-pass the filter.

I will get a sealed air hose and see how she goes.

be carefull with the Gori kit, my 200cc road tune barrels exhaust port was like a jap eye but more importantly the length of the barrel was 1mm shorter than a standard one , I ended up using a couple of RB20 head gaskets to get the correct squish after several head loosening experiences , but this year she's done the Derby150 & 4 Nations, a good kit with after market tuning, GT scallopped out head & Wossner piston.

Try Beedspeed, they supplied me with an old style series 2 hose with bottom drain pipe suitable for a 25ml Dellorto just a few weeks ago.

prog54 wrote:Try Beedspeed, they supplied me with an old style series 2 hose with bottom drain pipe suitable for a 25ml Dellorto just a few weeks ago.

Thank you - I called them but they didn't have anything suitable.