Rotten Orange build - Gary Fisher Aquila shifter buildup!

i see $$$ hemoraging!!!

very nice though

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Just so everyone is aware datz510's build is about as far from the norm as possible. His aluminum frame is causing some issues due to non standard tube diameters and bottom bracket sizes. However we are working closely with him as the solutions to his problems will help others that use frames similar to his. Due to his feedback we will most likely come out with a rear motor mount for aluminum frames and are currently working with our suppliers to provide a different bottom bracket spindle for the extra wide bottom bracket tube. I should also reiterate what Pablo alluded to and that is datz510 likes using high end parts and that Pablo and I both use run of the mill bike parts with great success, we just make sure that they are properly maintained.

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I am in the high end camp right with datz510. You are very right that even lesser parts are good with good maintenance. Actually the best parts with no maintenance is a worse solution than low quality parts with good maintenance. You are using medium quality with good maintenance so are in good shape. I am glad to have such a good problem solver as datz510 as a ridding buddy. , as that is a combination that makes bikes work, and generally well.

The Dellorto carb is an example of finding the best reasonable solution for a problem. You can see and feel the difference in the 2 small parts very easily holding both. One feels solid and looks well finished. And the Dellorto has a few extra adjustments that makes it obvious that it will be able to be fine tuned to work better.

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LennyHarp of Lenny's Bikes & Things
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The true value of a man is not judged by what he has, but rather by what he can do without.
"We are what we repeatedly do. Excellence, then, is not an action, but a habit." -- Aristotle

Thats how some of these builds go.. My build is definitely far from the norm. This bike presents some challenges due to the way it was constructed.

Just FWIW, this motored bike build is dirt cheap compared to some of my other hobbies, so its all good. You would probably have a heart attack if you knew how much money I have in some of my other projects. I enjoy building things and the challenge of it all.

In the end, I'll have a unique machine that should be a blast to ride.

Got the new derailleur and chain installed today. Now heading out to the garage to get a fuel tank built.

Tank is done apart from tank sealer and paint.. pics will be showing up shortly.

I ended up building mine just shy of 1/2 gallon capacity. It has a built in 2-3 oz sump to prevent starvation around corners. I also offset the filler neck a little towards the left rear of the tank. Clears the seat nicely and looks like it will work well. Inlet/filler is about 1-3/8" diameter. Outlet/drain is female 1/8" NPT pipe thread.

My only concern is since the carb is gravity fed and the rack is *just* slightly higher than the carb, I might starve the carb on severe up hill climbs. May look into a standalone diaphragm fuel pump to work as a tiny fuel pump to prevent this condition.

Found a small vacuum/pressure actuated diaphragm pump made for kohler and briggs and stratton engines on ebay for $20. Went ahead and ordered it just in case I need it.

HI Datz,

Just a thought but Nitro RC cars use a pressure tap off the exhaust I think to pressurize the fuel tank.....would that work?

Andrew

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Could tap the exhaust to pressurize the tank, but the potential for catastrophe is a bit scary doing that. Im sure it could be done though.

The exhaust COULD be used to generate a pulse to drive a fuel pump, but Id worry about soot buildup. I think I'm leaning more towards just tapping into the intake. The intakes on these 2 strokes naturally create pulses as well, so should work fine. I'll also be installing a boost bottle at the same time, so will work the required volume into that equation. I can experiment with it.

FWIW, here is the fuel pump I got:



One line runs to the vacuum/pressure pulse source. The other two are inlet and outlet ports for the fuel. should be a perfect setup for any HT 2 stroke that needs a lift pump

Here are a few photos of building the fuel tank today:

Here's one cap welded up. I used a 6" piece of 4" tubing for the tank body.


Here are the other parts that go into the tank:


Some photos of the fuel filler sitting in its cutout:
http://www.piratepathy.com/misc/gastank10.jpg


A photo of the tank with the other cap in place, but not welded yet: