Spitfire wants to go fast

Sprailfire340 · Post by **Sprailfire340** » Sat Dec 29, 2012 3:26 pm

Guys, need some help here...trying to diagnos problem from 200 miles away. My sons are at the cabin with cousins doing a little sledding. Got a 79 spitfire (kohler) converted to mikuni slide carb that goes like hell when you start it. Throttle cable not stuck and slide is moving freely up and down. Idle/air adjustment screws on carb seem to have no affect. Spitty only knows one speed - wide open. Would a stuck choke plunger cause it to immediately redline? A stuck float? Crank seals were replaced last season and it ran great.

HoosierDeereMan · Post by **HoosierDeereMan** » Sat Dec 29, 2012 3:50 pm

Mitch,

Did the "E" clip fall off the needle?

Troy

400brian · Post by **400brian** » Sat Dec 29, 2012 4:12 pm

My first thought is that it is getting air from somewhere.

Sprailfire340 · Post by **Sprailfire340** » Sat Dec 29, 2012 4:26 pm

Nope. They tell me the needle doesn't move in the slide. My best guess is a stuck float at this point.

HoosierDeereMan · Post by **HoosierDeereMan** » Sat Dec 29, 2012 6:12 pm

Is this something that had been running and now all the sudden acting up or is this the start up after the conversion?

Is it possible to get the floats installed up side down?

JDT · Post by **JDT** » Sat Dec 29, 2012 6:41 pm

Did the barrel pop out of the slot in the thumb throttle?

Sprailfire340 · Post by **Sprailfire340** » Sat Dec 29, 2012 7:06 pm

Barrel didn't pop. Throttle working as designed. Carb conversion was at beginning of last season. Ran great every time out. I just didn't have a chance to go through it as they just pulled it off the trailer for the first ride of the year. I'm going to jump in truck tomorrow morning and try to figure it out for the kid. I'll let you know what I discover. Thanks for the ideas guys.

lwb140 · Post by **lwb140** » Sat Dec 29, 2012 8:31 pm

im with brian on this one its getting unmetered air from someplace, a stuck float will just cause a gassy mess in the belly pan as the fuel will run out of the carb bowl vent tubes , what about the intake tube being cracked or loose, fuel pump pulse line sucking air, maybe the fuel pump diaphram doing something dumb ? just ideas wade

Viktory2k1 · Post by **Viktory2k1** » Sat Dec 29, 2012 11:16 pm

I can't wait to hear what you find. I'm with the above post as well.
Like carb half off.

Cabindweller · Post by **Cabindweller** » Sat Dec 29, 2012 11:33 pm

Could be the locking nut on the throttle cable came loose. I had a similar experiance with a Spitfire I just bought not to long ago.

Jerry

bernie tetreault · Post by **bernie tetreault** » Sun Dec 30, 2012 8:09 am

it is getting air from some wheer between carb @ motor.

Sprailfire340 · Post by **Sprailfire340** » Mon Dec 31, 2012 7:33 pm

Wow...This was a good one guys. Over the summer I switched out the original throttle block because the toggle kill switch is easier for the kids to operate. Blocks must not be the same thickness as the throttle cable is too short now. Slide moves up and down freely, but bottoms out at half throttle, thus the go like hell on start-up. Appears one needs to include a trailfire cable to make the conversion work properly. Kids also shelled a recoil on the other spitfire today. If anyone knows where I can buy a rebuild kit I'd appreciate it.

liquitisplit80 · Post by **liquitisplit80** » Tue Jan 01, 2013 4:37 pm

I bought my kit from car quest. The one here carries lots of aftermarket parts for sleds. The only info on the package is:
Fowler Distributors -Starter pawl kit F11-311.
Not an exact match but it works.
Hope this helps.

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