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Old 07-23-2013, 02:45 PM   #31
Airhead Wrangler
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Quote:
Originally Posted by centdukesfan View Post
When the engine stops, i believe there is air blowback which puts pressure on that connection.
Well, if the stock rubbers wouldn't hold it, I doubt you'd be better off with the silicone ones as they're a lot slipperier.
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Old 07-23-2013, 02:51 PM   #32
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Sounds like an ignition timing issue. Back firing while not rare is not normal. Can also be related to lean mixture which would be affected by air leaks in the intakes.

The carbs falling off have been a problem with bikes not running the OEM intake tubes to the air filter. The tubes to the air filter provide a major portion of support for the carbs. Other wise the rubber tube to the cylinder head side has to support the carb on it's own and often can not do this.

Are you running velocity stacks or K&N or other small filters? Neither of these is recommended for the street. The velocity stacks have No filtration and the oily K&N filters do not work as advertized. Running an internal combustion engine with inadequate filtration leads to early engine failure.

If you have the parts then put the plastic tubes back on. If you don't have the parts then get them. The Cafe type bikes with the small oily filters look good parked at the corner coffee shop. They do not win races and they do not rack up any miles.
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Old 07-23-2013, 02:56 PM   #33
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Quote:
Originally Posted by disston View Post
...the rubber tube to the cylinder head side has to support the carb on it's own and often can not do this.
...and bings are pretty hefty as carbs go.
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Old 07-23-2013, 04:49 PM   #34
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Originally Posted by disston View Post
Not all R100 engines are the same. This may be one of the years that has different sized metal spigots that screw into the head. If so it would work much better than rubber adapters.
Well, they all have threaded spigots. Only the R65 heads didn't. The 247 heads are threaded for either 32 or 40, and a few bikes with 32mm heads used tapered spigots to mount 40mm carbs (the opposite of what the OP wants to do).

And the spigot is exposed to gas; I don't see how anyone can think otherwise. The adapters in the first post say 'no gas' but the later ones don't.
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Old 07-24-2013, 06:08 AM   #35
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ive got stock intakes to the filters, the J tube between the carb and the filter correct?
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Old 07-24-2013, 07:13 AM   #36
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Originally Posted by centdukesfan View Post
ive got stock intakes to the filters, the J tube between the carb and the filter correct?
yes
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Old 07-24-2013, 12:10 PM   #37
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The intake adapters you asked about in the first post say they are not compatible with gasoline. Why they are calling these intake adapters is beyond me.

The second post from Blaine says they have intake adapters. Here's the link again.

http://intakehoses.com/Merchant2/mer...egory_Code=RSP
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Old 07-24-2013, 12:50 PM   #38
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/ Why they are calling these intake adapters is beyond me.
'Cause they're for the intake? The intake starts where the air enters and ends at the intake valve. lotta plumbing.
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Old 07-24-2013, 12:54 PM   #39
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Why they are calling these intake adapters is beyond me.
They don't. They call them reducer couplings, and describe uses that are farther upstream than the fuel is.
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Old 07-24-2013, 02:06 PM   #40
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", and intake components and piping."

Above is quoted from the specs.

Somebody could write them and ask. Maybe they are doing the overly cautious routine and these do work?

Edit;
I wrote tech support at HPS. Hopefully they will answer. I'll post what I get back if anything.
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disston screwed with this post 07-24-2013 at 02:19 PM
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Old 07-24-2013, 02:34 PM   #41
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Yes, intercoolers and so forth are intake components.
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Old 07-24-2013, 02:38 PM   #42
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Originally Posted by AntonLargiader View Post
Yes, intercoolers and so forth are intake components.
I get your point Anton. I read a bunch of stuff on the HPS site after I wrote them and now have to say I agree with you. They make Silicone tubing for the fresh air side of turbo systems and free flowing air intakes for street rods.

We still don't know what year this engine is.
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Old 07-24-2013, 04:46 PM   #43
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Here is the answer;

Thank you for your email. We dont recommend using our silicone hoses for fuel applications, but you can use it. We have alot of customers that run a carburetor setup that is simpler to yours where they get a mist of fuel passing the hose. The only down side is it will shorten the life span of the hose.


Thank you.


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Best Regards,
Hung H.
HPS Silicone Hoses
626-709-4835 ex240
www.hps-siliconehoses.com
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Old 07-25-2013, 01:14 PM   #44
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engine is from an 81 r100. Allegedly
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Old 07-25-2013, 01:37 PM   #45
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Also - my concern isnt the fuel necessarily - its the heat from the engine. Those spigots get HOT
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