IAME vs. Yamaha.
Reed valve vs. piston port.
Electric on-board starter vs. external starter.
Low maintenance/low stall clutch vs. high maintenance/high stall clutch.
Tillotson vs. Walbro carb.
KA100 has a few more hp.
KA100 seems to need less blueprinting & rebuilds.
KA100 is pipe exhaust, you can put a pipe on the KT100 but the “can” exhaust is more popular especially in sprint racing.
I think there is room for both engines in the industry after a year of watching the KA100. The KA100 could be the national level type engine, with the Yamaha geared toward more of the grassroots level of the sport.
This reply was modified 3 months, 1 week ago by David Cole.
I don’t have hard data, but it seems the KA100 is very reliable. TJ Koyen may be a good person to ask, or any one of the drivers from the USPKS program that raced in 2017 as to how much maintenance was required to keep it at top performance.
Ran the KA100 since December of 2016, great engine package. Blueprinting helped slightly (it will with any engine) but the stock piece is not far off at all and will be fine for someone entering 2-cycle racing. We ran entire season (12 rounds at GoPro) on one engine (had a stock engine to practice with), no piston or ring replaced– it has over 20 hours on it and runs with any of them. As with anything, fresher will be stronger so rebuild as you see fit. In short, great economical engine that really does create a very competitive class.
We literally ran a stock engine all season at USPKS, took 4th in points, and battled for the podium every weekend. No blueprinting.
Didn’t rebuilt it all season. I’ve heard of guys just pounding laps on practice days with them and they have dozens of hours on the them without any noticeable drop in performance or need to change pistons. We did a couple carb rebuilds after some rain racing etc.
The engine parity is great, the racing is really close, and it’s a super fun and reliable package that offers a nice step between the drone of a Yamaha and the chaos of a TaG engine.
No clutch to maintain, the starter/battery worked flawlessly all season, no radiators or water hoses to mess with… A super clean and tidy package that offers great racing and great reliability. It’s a win for me.
May I ask what is the largest driver available? On the X30 it’s a 16T. Is the clutch similar to the X30? I’m asking from the road race perspective. It would be nice to have a 100cc air cooled, push button start, low stall clutch engine on a CIK chassis for road racing. Kind of a lower performance, high reliability, IAME Sprint set up.