Subject: Re: Fuel valves, MD Rally

Author: Charlie Mullendore

Date: Sep 14, 2001, 1:27 PM

Post ID: 1708241657

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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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