Maintenance & Technical > KX500 Original

PORTING SPECS FOR BOTTOM/MID? ANYONE

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doordie:
MIKECALDERA!

  :oops:  :oops:  :lol:  :lol:   8)  8)

//doordie

MIKECALDERA:
Porting Results:
w/ FMF Reeds & Moose Spacer

1) Gained 15% on Low End
2) Gained 20% on Mid
3) No change on upper rpms

Powerband was shifted from mid range to low range.

Pulls much harder at lower RPM and you can't stall it in 5 gear w/ no throttle!!!!
She just continues on her journey.

Results: You must relearn the power characteristics as the power abruptly PULLS not hits much sooner. Its a different type of bike now but still fun to ride.

Conclusion: Unexpected HUGH gains in LOW/MID range making the bike OVERSHOOT jumps until you get acquainted with the Beast II!

All 15% was added in sheer power to the Lower and Mid ranges and none was lost at higher rpm.

Downside: Motor sounds even meaner and louder at lower rpms!

Mike.

You may notice a FLAW on the intake outside ports with metal "Flakes", "Chips" sticking out and obstructing unburned fuel flow. Get rid of this and just quit there. I went nuts! I think that was the greatest gainer for the time spent.

I would pay 200 bucks next time. About 20 hours cleaning and polishing and reshaping, widening and metal splinters in my lungs. Cough... Cough....

doordie:
MIKECALDERA,

It`s plain hard work to get result! :twisted:  :twisted:  :twisted:
//doordie

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