Hillbilly jetting It does work !!

[alexfleury]

I put Technigas pipe on my stock de-restricted 2001 Elite.



I had already put in an 85 main jet. So I did a trial run. Got 380-390 with a max temp of



NOT GOOD

So I ordered this drill bit set from Amazon

http://www.amazon.com/Forney-60239-Mini ... ll+bit+set

And I found this chart about drill bit sizes compared to measurement of inches and mm

0.7 mm
0.0276
0.7000
#70
0.0280
0.7112

#69
0.0292
0.7417

#68
0.0310
0.7874

1/32 in
0.0313
0.7938

0.8 mm
0.0315
0.8000

#67
0.0320
0.8128

#66
0.0330
0.8382

#65
0.0350
0.8890

0.9 mm
0.0354
0.9000

#64
0.0360
0.9144

#63
0.0370
0.9398

#62
0.0380
0.9652

#61
0.0390
0.9906

1 mm
0.0394
1.0000

#60
0.0400
1

The last number is the metric equivalent of the drill bit size. So a #65 drill bit is about the same size as a 89 main jet.

I tried this


And installed the drilled out jet and rode the bike again. I got temps of 375- 380 and a max of 397.

Better but still too hot if I want the engine to last. So I tried again and drilled the main jet out with a #64 drill bit. That is approximately equal to a 91 main jet.

Took a ride again, and each time I rode a couple of miles at wide open throttle and climbed a long steep hill.

This time I got temps of 340-350 with a max temp 376. I'm calling that GOOD. It was about 70 degrees outside but I think I'm in the safe zone enough to be good for Summer.

If you don't want to spend $10 for each jet and then wait for it to come in you might want to try my method.

It did work !

[Wheelman-111]

Greetings:

I got the Harbor Freight version. Micrometered each bit and drilled accordingly. Be careful not to wobble.

Warmer ambient air makes the engine run cooler. Very counterintuitive I know, but there's less O2 per unit volume, so combustion mixture is richer, cooler. Also slower.

[alexfleury]

Thanks for the info Wheel man and Graphite where did you get your jet index set?

[Dio89Elite]

awesome info.
I know it does work, just didn't have the info. Thanks for sharing.