the 22mm should be a great pick....1st thing to check is gaskets and o rings .....are they torn or swollen....if there is an air leak you cant tune it.
Thanks. Been through that. Had an issue at first with the intake manifold to engine gasket. It would not idle, but does so now that I've replaced the gasket.
gaskets good and bolts tight.
Only weird thing is I cracked my carb insulator spacer, so I totally removed it and have a cork gasket there now to prevent heat transfer. Could this be an issue at all? I can't find a replacement carb insulator anywhere that will fit.
next check the fuel level in the carb bowl...should be about 1/8" below the top of the bowl gasket. ( if u connect a small clear fuel line to the bowl drain and turn the loose end of the fuel line up and then losen the screw above the drain the fuel line will fill with fuel and show the fuel level) if it is way low or high ..you will need to bend the tab on the float to adjust the fuel height.
I've thought about this, but really don't understand how to test it. I can't really connect a small clear line to the bowl drain because there is no bowl drain on the VM22...rather a 10mm bolt that houses the main jet. When you loosen the bolt the bowl will drain...but there is no real way to hook up a line to it because there is no nipple. I see there is a carb overflow line, that if the bowl overflows it will drain. That is it. Any idea's? The carb was brand new to start, and from what I've read there should be no real reason the factory setting would be off...and messing with this could just make things worse.
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now crank it up and turn the idle screw in so it runs about 1500 rpms ...then adjust the mix screw to the middle point where it runs best. at idle ....then back the idle screw back to a normal idle...
I can get a good idle from a 20, 22.5 and 25 main jet...so not really sure what i'm looking for as all 3 work well. Does the slow jet have any affect on the main jet or needle? Example, if I run a 20 slow jet and a 150 main, and then a 25 slow jet and a 150 main, will the WOT and mid-range of both bikes be the same...or does the slow jet affect the total mixture for the main jet and needle?
now we can plug read the main jet ..... you need a place where you can ride it wide open... and a clean spark plug....
. get the motor warm then put the clean spark plug in ...now crank it back up and ride it wide open for a few seconds then while still holding the throttle wide open hold the kill switch down till she cutts off and pull the spark plug and inspect the color of the plug. if it is black or dark brown it is rich and u need a smaller main jet...if it is bright white it is lean and you need a larger main jet....if it is creamy to light tan its ok...
...now for the mid throttle response adjust the needle height up or down till it responds the best with no dead spots.. and your all set.....
Can do. I will test. I do know now that at WOT it bucks and farts at about 6500rpm...the bigger the jet I run, the more it fumbles at high rpm to the extent that I can't even rev it out. The leaner I go, the better it goes.
I had a 145 main in it, but my mid range was impossible to tune but I could cleanly rev out. I've just been told the 145 is damn lean on this bike/carb setup so I almost feel bad running it so lean.
With the 150/60/70 my midrange is epic...just the WOT gets even worse.
So I can either get a good midrange, or a good WOT...not both.
And, to make matters worse, quick throttle inputs from low rpm will result in a stall. I'm not talking anything out of the ordinary. I have 7 other carburated bikes, and this one is by far the worst. I can't give more then 1/2 throttle till about 3000rpm or it will just plain stall.
If its any help to diagnose, today I have a 20 slowjet and 150main. Midrange was ok, idle was not perfect but alright...and at WOT it would hesitate going past 7000rpm. When i run 3/4 throttle I have more power than at WOT. At WOT when I let off, it farts a little as I get back into 3/4 throttle and then gets more power at less throttle input.
Just curious what jet settings other guys are running on this engine/carb setup.