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  1. #1
    More than 10 posts! Club Member
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    Default KR-1S Engine Installation

    Has anyone installed a Kawa KR-1S engine and is prepared to kindly educate me as to the technicalities involved? Just so I don't reinvent the wheel. Many thanks. Paul

  2. #2
    Very active > 100 posts Scrutineer
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    Mar 2009
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    Default Re: KR-1S Engine Installation

    Not seen a KR1S in a hovercraft for a few years as the TZR remains the engine of choice in F3. Richard Wiles was the guy who did most with them but hes not involved much these days, but the rest of the Whitlesey lot might know a bit as well.
    From memory they were a little awkward to install as direct drive (pulley on end of crankshaft - not recomended) as the KIPS chamber on the side of the rear barrel gets in the way, otherwise the same principles apply as the rest of the ex bike engines - gearbox can probably be removed unless there some daft crankshaft lubrication system like Suzuki used, and the best approach is to run the output through a rubber coupling so not to overload the crank. Treat them like they are on the bike, mount the engine at the same attitude, leave airbox on, leave electrics as close to std as you can and dont put any significant kinks in the exhaust near the engine. Electric water pump will be required (get a good one) remove thermostate from cylinder head, mount radiator in centre of gaurd and calibrate the temp gauge.
    KR1S was always well know for variable build quality (barrels different lenghts etc) and the KIPS system was difficult to set up, so build it carefully, also had a reputation for piston ring pins falling out so warm the engine up before thrashing them.
    Dan

  3. #3
    More than 10 posts! Club Member
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    Default Re: KR-1S Engine Installation

    Many thanks for your time and advice, Dan. Very much appreciated. I'd come across a newly rebuilt race engine which was interesting as research showed that the donor road bike was the fastest 250 ever (correct?) But there must be limitations which have made the TZR popular.

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