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Old 06-07-2017, 08:36 PM   #1
johnwohl   johnwohl is offline
 
Join Date: Jun 2017
Posts: 2
Took a scooter in trade, doesn't idle

I took what I think is a Jonway Madness in trade for a debt and I'm having some difficulties getting it running. I've tuned EFI in cars for years but never messed with carbs.

This is what I know is on the bike from receipts;

high performance variator w/ 5 gram slider weights
performance exhuast system
performance cdi
performance coil
iridium plug
18mm carb w/ pod filter, #88 jet
performace clutch assembly w/ yellow torque and clutch springs
#38 pilot jet


I can't get it to start without a handful of throttle. The idle speed adjustment doesn't go that far. With me keeping the throttle open about 1/3 of the way it starts, increases rpms steadily for about 3 seconds, looses rpm, and unless I give it gas, dies.

I have the idle mixture screw set at 1 and 1/2 turns out but it doesn't seem to matter much unless i have it full lean or rich.

Here is a picture of the set up.

Looks like the vac port from the intake manifold goes to the fuel valve and the higher port on the carb.

The fuel fume vent thingy goes into the filter, as well as the vent on the valve cover.

The fuel line goes to the middle port on the carb.

Nothing is attached to the bottom port (the drain I think)
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Old 06-08-2017, 12:02 AM   #2
johnwohl   johnwohl is offline
 
Join Date: Jun 2017
Posts: 2
I got it to start and run. I figured out the vac line situation. only thing l have connected is a vac line from the intake manifold to the fuel valve, and the fuel to the fuel port on the carb. The valve cover vent and fuel vapor vent are going to the filter. It starts, idles, and drives. Has a good top speed but is VERY slow to take off.. like scary slow from 0-10mph. Pretty much have to flintstone it. Is that the weights?
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Old 08-12-2017, 08:29 AM   #3
padly1995   padly1995 is offline
 
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Posts: 81
Quote:
Originally Posted by johnwohl View Post
I got it to start and run. I figured out the vac line situation. only thing l have connected is a vac line from the intake manifold to the fuel valve, and the fuel to the fuel port on the carb. The valve cover vent and fuel vapor vent are going to the filter. It starts, idles, and drives. Has a good top speed but is VERY slow to take off.. like scary slow from 0-10mph. Pretty much have to flintstone it. Is that the weights?
6g weights worked best for me on 50 and 75cc setup...
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