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#4439741 - 06/23/17 06:25 PM diaphragm fuel pump not working - KT100 2 cycle
tomcat27 Offline


Registered: 06/25/09
Posts: 3564
Loc: Chicago, IL
after assembling a very sorry Yamaha KT100 2 cycle kart engine - it is not pumping fuel. I was a little surprised that the line from the engine to the crankcase actually seems to be pushing air - I was expecting suction. is that correct?
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2015 Rogue, 2014 Sentra, 2001 Camry, 2005 Starcraft, 1998 Dodge B1500
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#4439836 - 06/23/17 07:36 PM Re: diaphragm fuel pump not working - KT100 2 cycle [Re: tomcat27]
justintendo Offline


Registered: 03/04/17
Posts: 102
Loc: northwest pa
yes a two stroke builds pressure in the crankcase, totally different design than a 4 stroke. the pulses will operate the external pump if you are fitted for one
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2013 escape 2.0 awd
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1996 f150 4.9 2wd mtx
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#4439842 - 06/23/17 07:41 PM Re: diaphragm fuel pump not working - KT100 2 cycle [Re: tomcat27]
tomcat27 Offline


Registered: 06/25/09
Posts: 3564
Loc: Chicago, IL
thanks. sigh.....
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2015 Rogue, 2014 Sentra, 2001 Camry, 2005 Starcraft, 1998 Dodge B1500
1996 Sebring Jx, 1984 F150, 1970 Cougar, 2013 XT250, 2010 Vstar, 2014 CTX1300

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#4439929 - 06/23/17 10:03 PM Re: diaphragm fuel pump not working - KT100 2 cycle [Re: tomcat27]
Linctex Offline


Registered: 12/31/16
Posts: 6178
Loc: Waco, TX
When the piston goes DOWN, it pressurizes the crankcase - that's how the air fuel mix gets from the crankcase -> up through the transfer ports -> into the combustion chamber.

When the piston goes UP, it makes a vacuum in the crankcase.
That is how the air/fuel mix gets sucked through the carb.

Get it?
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#4440115 - 06/24/17 08:04 AM Re: diaphragm fuel pump not working - KT100 2 cycle [Re: tomcat27]
beanoil Online   content


Registered: 10/17/04
Posts: 2958
Loc: Midwest, Illinois
https://en.wikipedia.org/wiki/Two-stroke_engine

Simple design, not much power down low, but as it builds revs, it's a powerhouse.
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beanoil: Tough under heat, real dirty afterwards.

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#4455730 - 07/10/17 09:37 PM Re: diaphragm fuel pump not working - KT100 2 cycle [Re: beanoil]
justintendo Offline


Registered: 03/04/17
Posts: 102
Loc: northwest pa
get a big enough piston, and the power will be down low too!
_________________________
2013 escape 2.0 awd
2008 fusion 2.3 mtx
1996 f150 4.9 2wd mtx
1999 kaw zrx 1100
many husqvarnas

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#4456363 - 07/11/17 02:32 PM Re: diaphragm fuel pump not working - KT100 2 cycle [Re: tomcat27]
ironman_gq Offline


Registered: 04/30/14
Posts: 604
Loc: MN
diaphragm pulse pumps are dirt cheap for an externally mounted one, should be able to track one down on ebay or amazon for under $20.

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