Topica Loopframe_Guzzi Archive


Subject: Re: Fuel valves, MD Rally

Author: Charlie Mullendore

Date: Sep 14, 2001, 1:27 PM

Post ID: 1708241657


Hi Noel,
Friday, Sept. 21st thru Sunday, Sept. 23rd. See you there?

Charlie

Noel McCormack wrote:

 

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Hey Guys-



When is actual date of the MD rally?

Thanks,



Noel McCormack

72 Ambo
 From: Dennis Jones
Reply-To: Loopfram-@topica.com
To: Loopfram-@topica.com
Subject: Re: Fuel valves, MD Rally
Date: Thu, 13 Sep 2001 20:00:32 -0400

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Charlie,
That's all fine and good, but I for one am lookin' forward to seeing
that
 monoshock LeMans you were talking about. That'll be at Shepherdstown,

 right?
Dennis Jones
----- Original Message -----
From: "Charlie Mullendore"
To:
Sent: Thursday, September 13, 2001 7:35 PM
Subject: Fuel valves, MD Rally


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Hi Ian,
There are any number of inline valves made for lawn and garden
equipment
 that
 would work. I've got a couple from Briggs&Stratton that are about
$6 each
 and
 work very well in their original application. Should work just as
well in
 a
 Guzzi fuel line. Too bad the fuel tank outlet isn't 1/8 NPT, there
are
 others
 that would screw right in and even have screens (but no reserve
position
 of
 course).

Speaking for myself, I will be attending the MD Rally come hell or
high
 water!
 I'm working late every evening on a customer's Eldo so that he'll
be able
 to
 attend as well. The Nostalgia Run this weekend was great as usual,
but the
 only
 Loops there were mine and Dave's Norine. Loopframe withdrawal will
be
 setting in
 soon if I don't see more than two at once. Hopefully there won't
be any
 problems
 crossing into the US for you. Cheers,

Charlie



Ian Adkins wrote:

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Tom,

Thanks!

With all the gasket problems that I have had I look forward to
hearing
 what
 
 you learn from using vinyl as a gasket. I personally am ready to
ditch
 the
 
 standard petcocks that thread into the tank and get some modern
ones
 that
 
 attach onto the fuel line directly.

I was thinking....in plumbing there are "ball" type shut offs
where the
 seal
 
 is made with brass (maybe there is a gasket type material in
there?). I
 am
 
 not advocating using a plumbing shut off for the fule line but
was
 wondering
 
 whether there were petcocks out there that would be suitable for
gas?
 
 
 
By the way....are we all still planning to go to the Md Rally? I
looked
 at a
 
 long long range forecast. Thurs-Sat looks good. I'll cross the
fingies
 that
 
 this holds and that it stays nice through the weekend.

Andy...how's it going on the bike?

I keep walking by my bike in the garage. Funny but I have to
look at it
 each
 
 time I walk by. I can hardly wait to get on her and head
south...I just
 hope
 
 you guys let me across the border. In some ways though I doubt
the
 border
 
 crossings will as simple as they were in the past. Too bad.

Thanks again Tom....Ian

-----Original Message-----
From: Tom Bowes
To: Loopfram-@topica.com
Date: September 12, 2001 10:15 PM
Subject: And now for something completely different....

 
First of all, congrats to Ian for making the cover of the
September
 
 
 
 MGNOC newsletter.

A few thoughts on brake cables and petcock gaskets.

The last time we discussed the petcock gasket problem I thought
I had
 it
 
 
 beat by using Viton for the gaskets. I am sorry to say that,
alas, once
 
 
 
 again my efforts have failed. After about a month with the new
Viton
 
 
 
 gaskets I started having fuel starvation problems at speeds
over 65 MPH
 
 
 
 or when going up hills. Subsequent inspection of the gaskets
reveals
 
 
 
 that they have torn in between the holes for the fuel passages
and
 
 
 
 partially blocked the channel in the petcock rotor.

This leads me to think that the problem is one of the
mechanical
 
 
 
 strength of the gasket material, rather than the chemical
makeup of it.
 
 
 
 Viton is supposed to nearly impervious to fuels and petroleum
based
 
 
 
 solvents, and therefore should not have been adversely
affected. So,
 
 
 
 "what's the problem?", I ask rhetorically. My guess is that the
large
 
 
 
 amount of spring pressure on the rotor, and the lack of
lubricating
 
 
 
 properties in gasoline simply put too much mechanical strain on
the
 
 
 
 material and cause it to fail.

I had an original petcock gasket that I had removed, which I
took to
 the
 
 
 local rubber supplier. The owner looked at it and said that he
guessed
 
 
 
 that it was made out of vinyl, and not one of the fancier sort
of
 
 
 
 elastomers. I asked him if they had any, and he graciously
provided me
 
 
 
 with a sample. At present I am experimenting with a viton
gasket,
 
 
 
 lubricated with silicone grease, in the left petcock, and a
vinyl
 
 
 
 gasket, also lubricated with silicone grease, in the right
petcock. So
 
 
 
 far the vinyl gasket seems to be doing the trick, but I have as
yet to
 
 
 
 get the bike up to freeway speeds to really try it out. Stay
tuned,
 more
 
 
 info to follow.

Brake cables.......I had installed a front brake cable
(aftermarket) on
 
 
 
 the bike when I had originally rebuilt it. Gary Cheek took it
for a
 ride
 
 
 and commented on how much firmer the feel was on the brakes for
his
 
 
 
 Eldo. After some comparison he figured out that the original
brake
 
 
 
 cables have a larger core wire, larger jacket, and a different
rate of
 
 
 
 twist to the core wire than do the aftermarket replacements.
The net
 
 
 
 result is that the aftermarket cable appears to be made from
the same
 
 
 
 stuff as the original clutch cable. The core wire is thinner
and has a
 
 
 
 higher rate of twist, thus making it far more stretchy than the

 original
 
 
 cable. I found an original cable and swapped it for aftermarket
one.
 
 
 
 What a difference! Previously, I could pull the brake lever all
the way
 
 
 
 to the grip with no sensation of the pressure increasing once I
reached
 
 
 
 a certain point. This means that the cable was stretching. With
the new
 
 
 
 cable, the pressure increases linearily with increased pulling
force
 and
 
 
 will not allow the lever to reach the grip. For some of you who
are
 
 
 
 struggling with anemic front brakes this may be a contributing
factor.
 
 
 
 
Tom

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