Home Forums 2-Cycle Racing Moving to KT-100 – Looking for info

This topic contains 5 replies, has 5 voices, and was last updated by  patrick hubbell 11 months, 2 weeks ago.

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    Josh Hovermale

    I’m moving from a 4-stroke and I’m looking to get a KT-100.  I’m just wondering if anyone has any tips on what to look for.  I’ll probably be buying used and want to know if there are any casting #’s or serial #’s that are good/bad/indifferent?  Any and all help would be appreciated.  Thanks!


    David Cole

    I would contact any of the solid Yamaha engine builders in the midwest personally, to see if they have any good engines for sale – such as Comet Racing Engines.

    David Cole - eKartingNews.com Managing Editor -


    Josh Hovermale

    I’d like to know what I’m getting before I buy an engine.

    I’ve heard some discussion with the head on 2 fin vs 3 fin.  Some people like 2 fin, some like 3 fin. What makes each better / different? Some like a big bore piston, some like a small bore so there’s life left.  Whats a good range for the piston on a new/rebuilt engine?

    If I just went out and bought an engine from a builder, I really wouldn’t know whats good or bad at this point.  I just want to learn some of the basics on this engine package.


    tony zambos


    Add L.A.D. Specialties to your list of vendors to contact. They are excellent people to work with. Their engines are fast, reliable and repeatable performance, rebuild after rebuild. And their prices are reasonable. http://www.ladspec.com/contact.html

    I’d add the cost of a full rebuild to the cost of the motor. This way you’ll know exactly what condition the motor is in. Pick a builder and stick with them. Check out the Yamaha fields before you decide on whether you’ll be running a pipe or a can. Your builder will like to know. Pipe engines are going to have more maintenance then cans. Lower revs with the can make the difference. Put a second Yamaha on your wish list. It’s nice to have a spare at the track and also have the ability to have one motor in the shop while you have one on the kart.

    LAD Specialties / tony kart / rotax / kt100


    Shawn Piquet

    Some good info on pete mullers web sight. Not sure I spelled that correctly


    patrick hubbell

    As far as engine builders, go with someone local to you. This may get you track side help. Woltjer Racing Engines carried me to many wins including my first Duffy.


    Engines: Older is better when it comes to Yamaha’s.  They used better casting techniques. The cases were stronger and flexed less than the new ones.

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