• Husqvarna Motorcycles Made In Sweden - About 1988 and older

  • Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

    When he passed, I worked with his kids to gather the necessary credentials to keep this site running. Since then (and for however long they worked with Coffee), Woodschick and Dirtdame have been maintaining the site and covering the costs. Without their hard work and financial support, CafeHusky would have been lost.

    Over the past couple of weeks, I’ve been working to migrate the site to a free cloud compute instance so that Woodschick and Dirtdame no longer have to fund it. At the same time, I’ve updated the site to a current version of XenForo (the discussion software it runs on). The previous version was outdated and no longer supported.

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    Thanks for your patience and support!

Ignition timing vs octane

B

bobbyG

Husqvarna
B Class
Quick question. Say my top end is suffering from too much advance. Could I add octane boost to negate the advance?
 
Too much advance like an intense low end, almost wheelie popping, but no mid or top end. like its breaking up due to reasons I wont explain in this thread. (read here: http://cafehusky.com/forums/showthread.php?t=5442) I cant correct my timing easily (i dont know where im at as far as degrees go). Im wondering if I dump some high dollar Lucas octane boost or something comparable in there with some good grade gasoline what I will end up with.
 
You sound retarted!

No not you your ignition timing.

Octane boost would help if you were advanced.

You first needd to see where you are at as far as degrees in timing.

If this is out of your scope of ability or lack of proper tools, spend the money and take it to a mc shop.

Any good mechanic should be able to fix your retarted problem.

Oh, and if you can find out what the factory setting is before you take it to the shop.
That will save the mechanic time as we all know time is money.

Good luck and let us know how it comes out.
 
I remember that old thread. Most any used crank has the end which is broke. Have you put a dial indicator on what is spinning or done something similar to determine that it isn't wobbling. Maybe that doesn't matter. Get a timing light and see how much if any advance you are getting as the revs go up. I don't think these vintage have any advance. Put something down the spak plug hole paint a white line on the crank end.

The idea of race fuel or higher octane is that it doesn't flash into flames due to the principle a diesel engine uses and burns in a flame front spreading from a spark kernel. Just lighting race gas it sure does burn slower at atmospheric pressure and not vaporized.

I think you got scared off about the severity of the cost of repairs in the other post if you started another post stating your location and were wondering if folks knew reliable guys with boring machines and presses who do dirt bike stuff by word of mouth you will get a different take. Or you could go the parts bike route.
Fran
 
To much advance to me means you are firing further before Top Dead Center.
A couple degrees of advance will give a boost to the bottom and mid range, but you are creating negative work at higher rpms.
That's why the power goes flat at high rpm's.
You are also running the risk of detonating and distroying your piston.
Most performance increases require less timing advance.
 
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