Author Topic: LC water cooled carb  (Read 1538 times)

chaz35

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LC water cooled carb
« on: November 01, 2014, 03:38:24 PM »
I took my carb out to clean, was really gummed up, still working on it to free up the idle and main jets.  I was amazed to find coolant being piped through the carb.  Overkill, but interesting.  I bet some just splice the carb coolant hoses together rather than connect back to carb.  A fair amount of trouble to disconnect/ reconnect 2 more hoses to the carb.  I will probably put it back the way it was.  Ciao

1st and 2nd usually have an unfair advantage.  3rd is usually the best, can learn the most from.  paraphrased from Don Quixote, over 400 years ago, still true today

BettinANDlosing

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Re: LC water cooled carb
« Reply #1 on: November 01, 2014, 04:19:21 PM »
The reason for this is simple: You want the fuel being atomized to be a consistent temperature. If the carb didn't have a heater mechanism your jetting would be terribly effected by the outside temp. All carb. bikes have some sort of heater, the air cooled bikes have a hose from the cooling shroud blowing hot air. The 250's have electric heating elements. Your bike will run better with those hooked up.
2002 Kymco B&W 300; MRP 78MM "300CC", Naraku cam, Yoshimura rS3 exhaust, 17g Sliders, Yellow torque spring drilled airbox, stock carb #115 main #40 pj.

2001 "Yamaha" Zuma AKA MBK Booster; MHR OverRange, Dellorto 19mm BHBG, Polini "big" intake, RS-3 Rear shock, Stock cylinder.

tortoise

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Re: LC water cooled carb
« Reply #2 on: November 01, 2014, 04:23:42 PM »
working on it to free up the idle and main jets
Guidelines

BettinANDlosing

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Re: LC water cooled carb
« Reply #3 on: November 01, 2014, 04:30:53 PM »
The best thing for the idle jet is a strand of cable from like a scooter or bicycle. Just get one stand, and ram it through the idle jet until you can see light
2002 Kymco B&W 300; MRP 78MM "300CC", Naraku cam, Yoshimura rS3 exhaust, 17g Sliders, Yellow torque spring drilled airbox, stock carb #115 main #40 pj.

2001 "Yamaha" Zuma AKA MBK Booster; MHR OverRange, Dellorto 19mm BHBG, Polini "big" intake, RS-3 Rear shock, Stock cylinder.

gn2

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Re: LC water cooled carb
« Reply #4 on: November 01, 2014, 09:32:55 PM »
Coolant piped through carburettors is to prevent icing by heating them up.
A real problem in aircraft where you can't just pull over to the side of the road......

http://www.skybrary.aero/index.php/Piston_Engine_Induction_Icing

BettinANDlosing

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Re: LC water cooled carb
« Reply #5 on: November 01, 2014, 11:45:28 PM »
That's only part of it on scooter engines
2002 Kymco B&W 300; MRP 78MM "300CC", Naraku cam, Yoshimura rS3 exhaust, 17g Sliders, Yellow torque spring drilled airbox, stock carb #115 main #40 pj.

2001 "Yamaha" Zuma AKA MBK Booster; MHR OverRange, Dellorto 19mm BHBG, Polini "big" intake, RS-3 Rear shock, Stock cylinder.

gn2

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Re: LC water cooled carb
« Reply #6 on: November 02, 2014, 07:32:17 AM »
Really?
What's the other part?

BettinANDlosing

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Re: LC water cooled carb
« Reply #7 on: November 02, 2014, 03:58:26 PM »
I already explained ^^^^^ icing of gasoline is not a big deal unless your way north. The main reason for a heater element on scooter/bike carbs is to keep the gas charge at an even temp. Think about it, if its cold enough to ice up, the coolant won't be warm enough to de ice for the first 10 minutes of riding.
2002 Kymco B&W 300; MRP 78MM "300CC", Naraku cam, Yoshimura rS3 exhaust, 17g Sliders, Yellow torque spring drilled airbox, stock carb #115 main #40 pj.

2001 "Yamaha" Zuma AKA MBK Booster; MHR OverRange, Dellorto 19mm BHBG, Polini "big" intake, RS-3 Rear shock, Stock cylinder.

BettinANDlosing

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Re: LC water cooled carb
« Reply #8 on: November 02, 2014, 04:19:37 PM »
P.s. You don't have to be condensing in ever reply.
2002 Kymco B&W 300; MRP 78MM "300CC", Naraku cam, Yoshimura rS3 exhaust, 17g Sliders, Yellow torque spring drilled airbox, stock carb #115 main #40 pj.

2001 "Yamaha" Zuma AKA MBK Booster; MHR OverRange, Dellorto 19mm BHBG, Polini "big" intake, RS-3 Rear shock, Stock cylinder.

gn2

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Re: LC water cooled carb
« Reply #9 on: November 03, 2014, 08:08:27 AM »
Carburettor icing can happen when the ambient air temperature is well above freezing.

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