Carburetor Rubber Boot

[sfc]

I've got the keihin PE20 that I ordered from battlescooter but they were unable to get the rubber boot made so I haven't been able to put it on. In the mean time, I got the camshaft installed and did some port and polishing, jetted the carb, 85 is the number, and opened up the airbox.

But it isn't quite right yet. I really want to just throw the new carb on cause I've been spending hours tweaking the carb and I know that I'm just going to toss it when I finally get the rubber boot.

The problem is that battlescooter is so busy that they can't make it for me so I'm trying to come up with some ideas on how to make one myself.

I was thinking I could buy another stock one and then modify it, but people keep telling me that won't work. One guy told me to get a radiator hose and try to clamp that down, but I'm skeptical though curious.

So I thought I would throw it out there, Chanito? Dan? Others?, any thoughts on how to make/morph one?

Thanks

[Dandy Dan]

20mm isn't that much bigger than 18. You see if the stocker will stretch on with no mods. If that doesn't work try heating it up with a heat gun or a blower drier. You could also buy a bigger one and clamp in on to the intake port. This is kinda crude though. I'll think about it more....

That carb is still a CV type carb correct? Let us know what jet/shim setup you decide on. How much was the carb?

Check out this POD filter for just 28$ for the PE20.
www.twisted-grip.com/tg/twobros/cgi-bin/shopper.key_010-4-01-101_preadd_action.htm

[sfc]

The mouth that goes to the manifold is 31mm so it is quite bigger if the 18 is referring to that opening on the stock carb.

Here is the carb:

www.sudco.com/catalog105/114-115.pdf

[chanito]

The size of the flange should be close enough, the 18 mm size (or 20 mm) is the size of the bore where the throttle plate goes, but the size of the flange is a lot bigger, because they leave some area around the bore where air can circulate and keep the body of the carb cool, the rubber pipe is actually the mounting of the carb, if you just use rad hose the carb will vibrate awful and the float will just go crazy (sometimes starving, sometimes flooding), just remove the stock rubber pipe from the engine and use some KY jelly and a lot of patience and force it in your shining new carb, then install the whole Assembly back into the engine , let us know how the 20mm behaves

[SqUiRmInAtOr/ Phred 501]

chanito said:

KY jelly and a lot of patience and force

;D Good old KY an age old solution for makin things go where there no supposed to.(unlike vasalene it dries to almost nothing and is water soluble) There is a newer version named Astroglide and if you can find it, glycerin is super slick stuff . If you can't make the stock boot work, you might try a good hardware or plumbing supply. They make thick rubber pipe repair/adapters you might be able to make work for you. There designed to hold 60lbs water pressure and are easily twice the thickness of rad. hose.

[sfc]

Chanito:

"The size of the flange should be close enough...but the size of the flange is a lot bigger,"

So are you saying that even though it is a lot bigger it will be close enough?

So what will happen if it doesn't seal right?

[Dandy Dan]

It should seal better than stock because you're wedging it on to a tighter fit. If it doesn't seal you could seal it with marine glue, some kind of calking etc. I think Chanito had a typo in your quote there but I think he was trying to say that the actual flange the rubber boot goes on should be pretty close. The stock one isn't too tight so I think you could get it on something a few mm's bigger.

[chanito]

What i meant is they usually have one body and they machine it to make the different size carbs so the flange size (where the boot goes) should be similar, and like Dandy said i should not leak, because the hose would be even tighter, but if the flange is WAY bigger, then my friend you need to make a custom boot or if you are lucky and the size of the flange is close enough to the outer size of the boot you can cut the boot and use a radiator hose over the boot and into your new carb, just remember you need to keep the wall that separates the carb from the intake in the rubber boot

[habbitualoffender]

you said astroglide...hehehe...

[Doctavius]

Does something like this make alot more sense ?

cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=4556896210&category=34284

[smacky]

dandydan said:

20mm isn't that much bigger than 18.

Am i missing something here? Did sfc change to an 18mm carb, or are the specs at honda wrong -->powersports.honda.com/scooters/model.asp?ModelName=Ruckus&ModelYear=2005&ModelId=NPS505
they say our (us models) have 15mm carb. help me out here.

[Dandy Dan]

The Honda stats lie. They say we have a 15mm carb but we really have an 18mm. I'm not sure why they say 15mm (appease the fuel economy geeks or maybe they're mistaken). The Honda shop manual says its 18mm and Chanito and I have both measured and it is 18mm. The metropolitian scooter which shares virtually all of our drivetrain only has a 15mm carb. Perhaps it's cuz they know we'd wanna soup it up.

Props to Chanito for originally pointing this out.

[smacky]

Thanks for the info.