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Old 26 May 2014, 16:00   #11
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The 60 gasket set does not fit the 55, it has a bigger water jacket and head gasket. Others are the same.
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Old 26 May 2014, 16:05   #12
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Before you buy a 60block, it may be the 60d was the same bore as the 55. It was that age of engine. The carbs were bored out in an offset way. I think it would be too much for a zapcat though, they were a pure racer for lakes. A stock 60 with a 55 box would be interesting.
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Old 27 May 2014, 04:28   #13
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Thanks RIB-Teccie, this is great information.

I'd not heard of the 60d, must be very rare. I know the 70CES is very sought after, although I think it's a bit heavy for a thundercat.

It seems to me I want the 60 gearbox? which will give higher top speed but less acceleration.
Think the hard part is finding a short shaft one with the 1.71 (14:24) ratio gearbox.
Not much point changing to a 1.84 gearbox, the one on my tohatsu 50 is 1.85 and I'll be able to spin it to over 7000rpm.
Think the 55's use the same props as well, 13 spline.

I don't think you can have too much power on a thundercat, as long as the engine is light enough.

Is yours short shaft?
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Old 27 May 2014, 07:43   #14
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I have various yam 55 & 60 parts, but not in short shaft. They do come up on eBay as 55ae short shaft yams. The problem is a the racers are still after them and you pay a premium for something very old and hard to break down. The 55 won't come with the 60 box you are after. The shaft is not too hard to replace and you may find what you need on the crowley site. There's no easy answers for your project I'm afraid.
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Old 28 May 2014, 04:52   #15
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Ah right ok. I'll keep an eye out on ebay.
I'll stick to the tohatsu 50 for now.
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Old 28 May 2014, 14:43   #16
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There's a short shaft on eBay now. Trouble is there's a boat attached!!

291151494436
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Old 08 June 2014, 04:27   #17
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Haha!
Even with the boat it's cheaper than a used tohatsu 50
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Old 08 June 2014, 04:34   #18
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You will probably find out why wham you try to strip it down, they can be pigs if the bolts are seized. On the plus side if they do come apart and your willing to spend, you get a cracking engine.
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