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Premium Member
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2,359 Posts
Airbox lid removal (requires rejeting)
Clear tube mod for carbs (I think this is a sticky)
For more top speed you can cut the inductor wheel back to 1/2 or only 2 teeth ( inside clutch cover and for max speed only)
If you want less top speed and more punch off the line put in a smaller front sprocket.

Full exhaust - not so cheap
+more that would be best if you just read
 

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Hot Cam. Stage 1 works with the factory valve springs. Stage 2&3 require stiffer valve springs.

11:1 high compression piston.

Use a ProDesign K&N ProFlow kit. It allows you to remove the air box lid wich will gain you about 3 hp. You will need #25 pilot jets when you do this.

Port the head.

You can do the piston, and cam for about what you would pay for a new exhaust system.
 

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Premium Member
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What do you mean by easy?
- No internals of the engine?
- No major work done by a machine shop?
- Free?
 

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Aside from hacking away at the speed wheel or disabling the parking brake and reverse limiters or making sure the carbs are properly adjusted there is no such thing as a free 660 performance mod that I can think of.
 

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Master of the Electron
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15,680 Posts
As alluded to in your other thread, removing the baffle and opening the airbox, with the proper jetting, can add a very modest amount of performance - a small fraction of what a good aftermarket pipe/exhaust with the same airbox mods and proper jetting will do for you.
 

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I am unique
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Drill holes in the air box lid and box, but you will need to rejet and buy aftermarket needles, and they arent free............
 
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