Topica Loopframe_Guzzi Archive
 

Subject: Re: Fuel valves, MD Rally

Author: Dennis Jones

Date: Sep 13, 2001, 5:04 PM

Post ID: 1708230617

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" <C.D.Mul-@worldnet.att.net>
To: <Loopfram-@topica.com>
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 <kk-@home.com>
To: Loopfram-@topica.com <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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