Adjusting Idle Mixture on BSR40

I have an 04 Roadstar and the idle mixture is (surprise) too lean.
The specs list a setting (2 1/2 turns) for the pilot screw, but it's
not identified on the carb parts call out (it's a Mikuni BSR40). Does
anyone know where this screw is on the carb?

Thanks,
Chris

Chris Iriarte wrote:
 >
 > I have an 04 Roadstar and the idle mixture is (surprise) too lean.
 > The specs list a setting (2 1/2 turns) for the pilot screw, but it's
 > not identified on the carb parts call out (it's a Mikuni BSR40). Does
 > anyone know where this screw is on the carb?

It will most likely be under a metal cap that has to be removed, if it's
anything like the mixture screw on my SV's Mikuni BDSR39 carbs. The
easiest way is to *carefully* drill through the cap, making sure you
don't drill into the brass mixture screw underneath. Then screw in a
wood screw into the hole and pull on the screw with a pliers to remove
the cap.

Here's how one guy did it, your carbs are obviously different but the
same idea should apply:

<a style='text-decoration: underline;' href="http://www.geocities.com/catpoopman/airfuel.html" target="_blank">http://www.geocities.com/catpoopman/airfuel.html</a>

Get the genuine Yamaha service manual. It might seem pricey, but it's
cheaper than a single valve adjustment and will pay for itself the
first time you use it to avoid having to go to the dealership.

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Mark '01 SV650S '81 CM400T '99 EX250-F13 DoD #959635 RFB #2<!-- ~MESSAGE_AFTER~ -->