I recently aquired a Whip 440 in pretty good shape, After a thourough cleaning of the fuel system it does run. It runs rough on high throttle and seems to "build up" after short distance and wants to foul plugs. Two questions: Are these sleds hard to find parts for? Second is this problem in the carb adjustment? I am running 40:1 mix of clean gas, new oil, and lead additive along with Champion N3c plugs. Mainly running short distance with kids, no cross town stuff yet. Do I need hotter plugs? I want to make sure I can get other parts before I sink much $$ into it, like track, Cuyuna engine parts, walbro carb parts, boggies, ect. I appreciate any help. [email protected] <font color="blue"> </font color>
Don't know about parts availability but regarding the plug fouling it sounds like the high speed jetting is off. Depending on the model of Walbro carb used there will either be a high speed adjusting needle on the top of the carb body or more likely there is a main jet on the front of the float bowl on the airbox side. You are too rich on the high speed jetting so it will either take a smaller number of main jet or if it has the adjusting needle on the top you will have to turn it in to lean it out a bit.
<font color="red"> </font color> Retiredpop, thanks for the info I'll check my carb out and make the adjustment. Also will a hole in the muffler affect the engine? I know at there is at least one (Extra) hole I can patch. Also fuel mix, manual says 50:1 label on engine says 40:1 I have been using 40:1 . Thanks for your help
Thanks for the help, I really appreciate it. Now I'm putting the muffler back on, and will run through the rest of my 40:1 fuel and start mixing 50:1 after that to see if that affects it much. Again thanks for the help guys!! [img]images/graemlins/grin.gif[/img]