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post #1 of 6 Old 02-10-2013, 09:58 PM Thread Starter
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685 questions

I recently installed the 685 kit in my 2011 650 with an FMF pipe, flowed the head and rejeted the carb with a 155 main. Does a set of high profile cams add enough power to warrant the cost?

Does adding a tooth to the front sprocket bring back any of the fuel range without killing acceleration? I went from 220 miles to reserve to 150 miles to reserve.
thanks
Lance
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post #2 of 6 Old 02-10-2013, 10:14 PM
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Re: 685 questions

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Originally Posted by lance View Post
I recently installed the 685 kit in my 2011 650 with an FMF pipe, flowed the head and rejeted the carb with a 155 main. Does a set of high profile cams add enough power to warrant the cost?

Does adding a tooth to the front sprocket bring back any of the fuel range without killing acceleration? I went from 220 miles to reserve to 150 miles to reserve.
thanks
Lance

Seems like you're way rich on the main. Stock is what 142? How did you decide on the 155?

No eye has seen, no ear has heard, no mind has conceived what God has prepared for those who love him. 1 Cor 2:9
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post #3 of 6 Old 02-10-2013, 10:55 PM
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If he has a different jets kit that stock he will be using DJ numbers.....I have 145 in mine and have zero issues with fuel mixture. That is when using the stock carb....but have since switched back to the FCR.
I also have the megacycle cam with the .410 lift.....yes they are expensive! You do feel some benefits for sure but if you add a FCR the thing will want to scream up and past redline....it really wakes the full package up.....if you have a 685 size kit, stage II headwork, then add a set of cams the FCR will make your bike very very responsive to say the least!!! Ask me how I know....also ask the few who have ridden it. That is if you don't trust my opinion.....doh!
I also have 16/42 gearing as I ride 99% on the street.
Roll on wheelies easily in 1st at any RPM so to speak and second with a bit of a jab....

Willys
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post #4 of 6 Old 02-11-2013, 01:49 PM Thread Starter
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stage two KLR

The 155 main jet was the recommendation of the Moose Racing kit. With an opened up air box, a K&N air filter and a FMF exhaust. I installed an adjustable needle, drilled out the slide hole and drilled out the fuel screw plug.

The bike now just motors away from a stock bike but I sure lost the range!
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post #5 of 6 Old 02-11-2013, 02:08 PM
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It takes a set amount of horsepower to drive a bike at a given speed, and it doesn't matter what the engine is capable of. A stock bike, making 35 horsepower and set up with an air:fuel ratio of 14:1 will deliver the 15 horsepower required to drive the bike at 65 mph down the road.

A modified motor, capable of 45 horsepower and set up with an AFR of 14:1 will deliver the 15 horsepower required to drive the bike at 65 mph down the road.

The above is simply the laws of physics and thermodynamics.

What will be different will be the throttle position required to make that horsepower.

If, after modifying a motor, the fuel economy suffers greatly the usual cause is one of three things:

a) an extremely rich AFR.
b) the mods have mad you so happy that the bike is being ridden like it was stolen.
c) a+b

T

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post #6 of 6 Old 02-11-2013, 03:07 PM
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Geez, Lance, I've played 20 questions...but 685 questions!
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