BIGGER carb on 89 Marathon

1989Marathon · 10-31-2010, 04:31 PM

I just installed a Mikuni VM32 on my 89 Marathon. Tons more get-up-and-go! The pilot and needle jet circuits are good, it needs a smaller main jet.
I made a manifold up quick to see how the carb would work. Now I need to finish the manifold and get rid of the JB Weld. It doesn't hold. I added an oil injector port to the manifold because I REALLY don't want to pre-mix. I have the pump linkage all the way open for now, and will watch the plug to see how it's burning. If I have to pre-mix, I will.

The stock throttle cable only moves about 1/2", and the mikuni moves about 1-1/4", so I made this adapter plate. Keep in mind that this was all for testing the carb. I'll make both pieces again so they don't look so redneck.

rib33024 · 10-31-2010, 04:50 PM

Cool, keep us posted

10-31-2010, 04:31 PM	#1
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	BIGGER carb on 89 Marathon I just installed a Mikuni VM32 on my 89 Marathon. Tons more get-up-and-go! The pilot and needle jet circuits are good, it needs a smaller main jet. I made a manifold up quick to see how the carb would work. Now I need to finish the manifold and get rid of the JB Weld. It doesn't hold. I added an oil injector port to the manifold because I REALLY don't want to pre-mix. I have the pump linkage all the way open for now, and will watch the plug to see how it's burning. If I have to pre-mix, I will. The stock throttle cable only moves about 1/2", and the mikuni moves about 1-1/4", so I made this adapter plate. Keep in mind that this was all for testing the carb. I'll make both pieces again so they don't look so redneck.
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

10-31-2010, 04:50 PM	#2
rib33024 ...................... Join Date: Apr 2009 Location: FT Lauderdale FL. Posts: 16,416	Re: BIGGER carb on 89 Marathon Cool, keep us posted

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