Honda Spree and Elite 50 Forums

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 !

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.

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

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