Ok guys today I pulled the cooling tins, the number spark plug hole is stripped, so I had to remove them to get it ready for a helicoil. But while I was at it. I decided to go ahead and document my cheap bastard offroad racing PICT 34/3 carb mods. Basically this is to make the carb flow a little more CFM, have less to go wrong, and make it run better over rough terrain and severe angles. This isn't done yet, I still have work to do to get rid of the PICT 34/3 & 009 combo bog that these motors are world famous for, but this is the first rendition.
On to the pics
Ok first things first, to smooth out flow and get a few extra CFM I deleted the choke rod, butterfly and screws.
No with that gone, there is no reason for the big chunk of aluminum made to house the automatic choke components. So 15 minutes with a hacksaw and we have a much smaller carb that takes up less space and looks cleaner.
Now with that done, it was time to clean up the other side of the carb. Out comes the hacksaw again. I cut the idle fuel cutoff switch right at the nut. I dont have pics, but after you cut it off you basically have a hollow bolt. Fill this bolt completely with RTV, JB weld, ETC. This is what it looks like with that piece gone.
Now one issue with these carbs is fuel spilling out the bowl vent into the throat and causing serious issues on steep climbs and rough terrain. To deal with this there are to methods. I'm showing the simple one right now, but I will be doing a different mod which will be posted later because I don't like the airflow disruption of this way. This method is as simple as clamping a piece of 1/4" fuel line to the vent and routing it out the aircleaner.
The second version I will be working on later this week is to block the stock bowl vent, drill and tap a 1/8th npt nipple into the bowl and run the vent line up the frame. I will be showing that later on as the build goes.
To deal with the bog, I adjusted the acc. pump to produce the max amount of fuel on each squirt. I also aimed the acc. pump nozzle straight down the barrel. Another mod thats up coming that I will also be showing is to remove the throttle plate and solder the hole is the plate closed to produce more vacuum under the plate and draw more fuel at idle and part throttle.
Well this is it for now, the build will continue slowly and hopefully I'll have exactly what I want before the end of the year. Thanks for tuning in guys