IAME KA100 Maintenance and Rebuild Time


(James McMahon) #1

How is the piston life looking for our KA100 racers in the US.

What kind of time are you guys putting on pistons (and or rings) before swapping them out? I’d be curious to know the fuel, oil and ratio you guys have been running too.

IAME KA100 coming to America
(TJ Koyen) #2

Did 4 weekends last year without doing a piston.

I’ve heard reports of guys just beating on the engine and pounding hundreds of practice laps without changing pistons. Every time they take the engine apart the piston still looks new.

(Chris Hinrichs) #3

Any body else want to share what there maintenance schedule looked like for an entire year at Gopro or USPKS?

@tjkoyen did you have another other issues with the motor over the year? Clutches, starter, wiring?

(TJ Koyen) #4

Zero issues, zero rebuilds for a full season at USPKS.

We rebuilt the carb once or twice because we raced in the rain. But other than that, we literally didn’t touch or fix anything on the motor all year. Starter worked great all season, clutch looks brand new still, same with the wiring.

(Chris Hinrichs) #5

Thanks TJ. Wanted to see if the issues the guys down under we’re having showed up here too.

(TJ Koyen) #6

I think many of the issues that the Aussies had when the engine came out was with the original carb that we never had to deal with. The Tillotson carb has been trouble-free. Maybe someone from down under can correct me if I’m wrong.

(Bill Holt) #7

The Issues “us Aussies” have had with the engine were mainly political, and nothing to do with the engine.
@tjkoyen is correct about the Carb, but only with the motor in restricted format.
Otherwise it has been the best change in Australian karting.

(James McMahon) #8

5 posts were split to a new topic: Is there much life left for KT100 classes in the US

(Mike Lyda) #9

Adding to this old topic to report after another year of running KA.
After two full seasons at gopro and a season of Man Cup… my observation is the KA is an awesome engine. It’s been low maintenance and has great parity.

Tips and warnings/rumours from the pits:

  • If you spin it high (15k+) then replace the reeds often. Check to see if they’re sealing after each race day.
  • 10-15hrs between top end rebuilds if you don’t spin it high? Absolutely.
  • There have been reports of some older piston ring pins coming out and allowing the ring to spin. The results aren’t pretty.
  • After 5-6 hours you’ll have a sputtering top end if you don’t put a carb rebuild kit in.
  • Clean the clutch at the end of the day.

(James McMahon) #10

Can you say why this is the case? Inlet needle isn’t sealing, or something else?
Assuming by spluttering you mean it’s running rich…my guess would be it’s needle not sealing, from oil accumulating on it over time. The metering gets messed up and more fuel gets dumped into the metering chamber.

(Mike Lyda) #11

… not sure on the reason. I normally do a carb rebuild much sooner than that. When I’ve heard people say they were “sputtering on the straights, rebuilt carb, and sputtering stopped” they’ve gone 5+ hours before the carb rebuild.
My hunch is the diaphragm gets hard and stretched so it’s not pumping enough fuel to sustain 14-15k rpm for long.

How long you let it sit with fuel in it is a big factor too…