Yeah I am trying to step up my carburetor game. Don't know why I chose the vm18 over a phbg, but I did. So here we are.
I have not changed out the atomizer or the needle. I have changed out the main jet and the idle jet trying to get the bike to run better with the throttle more than 1/2 open.
I started at a 30 idle jet with a 100 main jet.
The bike started easily with the 30 idle, but after heat cycling to break in the kit, the plug had a lot of carbon build up so I figured that was too big so I went down to a 25.
The 100 main jet with the needle in the middle position bogged down and killed the engine at any throttle position. I dropped the needle to the top position and the bike gained some throttle responce. It would still bog and die at WOT though.
Now here is where I am still trying to understand things.
By dropping the needle down it closes off the fuel, leaning out the mix. So that says to me that I would want to down jet my main.
I down jetted to a 95 main and kept the needle in the same position. The bike has some more throttle response than before but still bogs at WOT. I did take the bike for a spin and just had to half throttle up to speed, hit 38mph but it started bogging when trying to open up the throttle all the way so I backed it off.
I checked the plug after my run and it looks a bit too lean. I have not played with the needle just yet, but will it richen things up enough?
Is there any difference in feel or sound between a lean bog vs a rich bog?
My temp gauge never got up over 310, but I was not running for very long.
70cc tccd kit w/low comp head
Mlm peoples pipe