From:Dave Hennessey e-mail:dave-A-toyhouse.org
Subject:RE: RE: RE: 1960 Super 10 Timing Date:Tue May 15 19:43:33 2018
Response to:22714
Has the bike always done this since your restoration, or is this a recent occurrence?

It's hard for the timing to get very far out unless you've disassembled the magneto or rebuilt the lower end.

I think that the problem is more likely in the points or carburation. If the points are too far open, as your engine speed increases, they may "float", and never really close. I'd remove them, and take a close look. If they're pitted, you need to file them down. Set them at .018 (both sets).

Years ago, I had a 1960 Super 10 that would not start unless I gave the points a quick lick with a file. Then it would start and run fine. The metal had crystalized or some such thing. Check with Duane Taylor or harleyhummer.com and see if they have replacement points for sale.

Carburation - two ideas - check for an air leak where the carb meets the cylinder flange. Spray some choke cleaner (good luck finding that anymore) or some brake cleaner at the joint and see if it changes anything.

Could you be running out of gas? If your petcock is partially clogged, or your gas cap vent is clogged, the engine might be using gas at high speed faster than the float bowl can fill back up.

Pop off the gas line and see how fast gas comes out of the tank. Also check your float setting*** Leave your gas cap loose and see if that fixes it.

*** I recently had a similar problem with my 55 B (pretty much the same as your 60). I messed with the main jet, and that helped a little, but didn't fix it. Then I checked the float - it was WAY off. I have no idea how it got that way - it just sits inside the bowl with no external forces on it - but it certainly was way off. I adjusted and it runs fine now.

Hopefully your problem is one of these simple things. Let us know...



----- ORIGINAL MESSAGE FOLLOWS -----
It does. First and second gears are pretty much useless. Once I get to third I have
a little more range, but once the rpm gets back up it sputters again.

----- ORIGINAL MESSAGE FOLLOWS -----
does it do the same thing if you go the same rpm in each of
the 3 gears?

----- ORIGINAL MESSAGE FOLLOWS -----
I restored a 1960 Super 10 a couple years ago and have ridden
it quite a few times. I noticed that once I get up to speed
(about45 mph) the engine starts to sputter. I've thought it
was a carburation issue and have adjusted and readjusted
numerous times with no change. I got to thinking about it
and thought maybe the timing is off. Anyone have experience
with an issue like this? Do I need to advance or retard the
timing to dial this in? Do you think timing is the issue?

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