79 CM400T Running rich, no power past 1/4 throttle

[KillboyPowerhead]

Hey guys!

Trying to help my buddy get his bike running so I have someone to ride with.

Basically whats happening is the bike wont get over 50km/h (Canada eh?) after about 1/4 throttle its got no more power. Its running very rich, plugs black and a lot of smoke out the exhaust.

I have the carb appart and everything looks like its in working order. I however know someone had taken his carb apart previously and lost two black plugs that go in the fuel bowls. I did some reading and found out they're called "slow jet plugs." Im havnt a hard time finding information on what they are and what they do exactly.

My question is, what do they do and would their absence be causing my running issues?

 

[fresh_c]

Is the bike stock?

 

[Maritime]

Those plugs keep the bike from doing exactly what it is doing. At more then 1/4 when the main jet starts to kick in the slow jets that at not plugged also dump a bunch of fuel. Being in Canada, as long as the bike was sold here, there is a difference in the carbs. Our CM carbs don;t have some of the emmisions crap the US carbs did and they are easier to tune for PODS and open exhaust. Post up a pic and check out the CM pod thread as there is discussion about the different model CV carbs that came on the CM in different markets. Replacing the plugs is a good start.