Carbs: How Close is Too Close (to cylinder)?

Kioshk · Jan 9, 2013

Howdy,

I recently installed an X80 which came with a really well made though reAlly short intake-plenum. My NT Speed carb fits it quite snugly, although it is now very close to the cylinder. The engine runs great, but the carb is noticeably warm/hot. I know that closer is better for carb-to-engine flow, but should I be concerned that the carmay get TOO hot?

Nashville Kat · Jan 9, 2013

I've run the billets for a couple three years with Speed carbs, and havent had any problems- all I can say-

and that the chinese I guess now have one out new at boygofast or luckyyearly for under $10 shipped- not as nice as creative or Pirates but cheap, huh?

http://www.ebay.com/itm/80cc-gas-bi...Cycling_Parts_Accessories&hash=item2a27c8bffb

http://www.ebay.com/itm/motor-motor...925?pt=LH_DefaultDomain_0&hash=item20ce751095

Kioshk · Jan 9, 2013

Thanks Kat!

My billet's not as fancy (with that O-ring), but it's the same size. Breaking in a new X80 tonight, and after about 30-miles, the carby seems OK. I figgerd that the heat would make the fuel more volite and in turn affect atomization. Maybe it does, positively.

bairdco · Jan 10, 2013

there were some early 50cc china motors where the carb bolted right to the jug without a manifold.

i've got motors where i've built manifolds that are as short as possible, like an inch long. never had any problems.

i think, the shorter the better.

headtrama · Jan 10, 2013

Yeah in this case shorter is better .

Kioshk · Jan 27, 2013

Hey all,

Just a follow-up: average engine temperature has decreased after break-in, and even at its highest operating temps, the carb performed like a champ. I experienced no ill effects due to the carb heating up.

Thanks all for your input.

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Carbs: How Close is Too Close (to cylinder)?

Kioshk

Active Member

Nashville Kat

Well-Known Member

Kioshk

Active Member

bairdco

a guy who makes cool bikes

headtrama

Member

Kioshk

Active Member