KT100 direct drive vs clutch

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TimKoch

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Hi, i just picked up a used KT100 that was set up as direct drive. I'm not putting it on a conventional kart, but am putting it on my powered longboard. My question is should I keep it direct drive or install a clutch? Thanks!
 

anderkart

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If you run a clutch you'll need an electric kart starter, do you already have one?

PS:
Yamaha used to sell a recoil/pull-starter for Ultralight airplanes with KT100 engines, but they're pretty rare and hard to find nowadays... Does your engine already have the pull-start option?
 

TimKoch

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No starter currently. The previous owner either started it with a drill or a push. Push starting for my application would be super convenient, i was more worried if it's harder to slow down with no clutch (i have only one rear disk brake)
 

TimKoch

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That's what i was thinking..how rough is the deceleration with direct drive though?
 

bob58o

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That's what i was thinking..how rough is the deceleration with direct drive though?

I have no idea. Never had anything like that. But I've been thinking about a motorized mountain board too.

I think itsid mentioned he has a direct drive race kart IIRC. Maybe he'll pop his head in here and share.
 

TimKoch

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Motorized mountain boards are a riot..they were the reason i built this board a few years back. I'm just rebuilding it because I scored a kt100 that's been freshly rebuilt for 75$ and it'll make a fun project for the winter.
 

TimKoch

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KT100 engine bolt pattern

Anyone know the bolt pattern for a KT100 engine mount? Thanks!
 

itsid

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Hi Tim..
Sure
Newbcarter currently restores one, I asked him to join in on this topic :D

AFAIK it's 70mm x 96mm
but since I do NOT own one I am not 100% sure about it,
nor could I say what bolt sizes are used.

'sid
 

OzFab

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As this relates directly to the content of your other thread, threads merged...

Please keep all related post to a single thread...
 

NewbCarter

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Bolt pattern should be 70mm x 96mm as per Yamahas instructions , bolt size i will need to double check , since i did not measure them .

Ignore the previous , bolts are M8x25mm . And a link to them :
https://cometkartsales.com/5.-Yamaha-Motor-Mount-Bolt-8mm.html

As for clutch or direct drive , depends on your needs ... There is a big assortment of clutches to pick from , but you will need an external starter with a 17mm nut adapter to start it , or if you have the inbuilt starter like i do .
 

TimKoch

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Thanks a bunch!..and I think I'll leave it direct drive at first and see how she does..the thing I'm wondering is if it makes it harder to slow down with DD? I only have one rear disk and it's not overly big..just want to make sure i can slow down safely..lol.
Thanks again!
 

NewbCarter

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Thanks a bunch!..and I think I'll leave it direct drive at first and see how she does..the thing I'm wondering is if it makes it harder to slow down with DD? I only have one rear disk and it's not overly big..just want to make sure i can slow down safely..lol.
Thanks again!

Shouldnt make a large difference to slowing down .. at least i havent heard so from the guys that race them .
 

TimKoch

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And lets say i decided to go for a clutch for practicality..where would be the best/cheapest place to look for one?
 

NewbCarter

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Gut reaction was ebay or any karting sites that have knowledge of Yamahas ...

Mostly because of price , a good clutch brand new will set you back 250+ USD , or more .

To my knowledge my engine came with the standard yamaha clutch , tho i havent found more than that .

Other than that , to go with wet or dry or whatever , im not knowledgable enough to give useful advice .

But as said , try ebay or maybe even contact the guy you got the engine from .
 

TimKoch

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Thanks, ya..i won't be spending that kind of money on a clutch..lol. But I'll keep an eye on ebay and I'll check out some B.S.T. groups to see if i can find something cheaper.
 

TimKoch

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Will post some when it's more together. I have it in pieces right now getting ready for the upgrade :)
 
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