[seruzawa]

Sometines....

Beacuse you didn't PUT A FREEKING JET KIT IN...that consists of BIGGER JETS...to compensate for the increased AIR FLOW...after you put that dang Yoshi pipe on it...

DO that, (put a bigger jet kit in) and the problem should be solved. That, or put the stock pipe back on, see if it runs ok..and if it does, you'll know why.

....ya just gotta take a breath. Hard to believe it but most people have no clue when it comes to exhaust/intake mods.... witness the high rate of loud bikes (cruisers and sportbikes) making like .38 Specials.

 

[seruzawa]

Good catch.

Exactly. John Burns had this exact problem in his recent article in Cycle World.

But with the mods he probably will need a jet kit anyhow. Bikes run pretty lean stock. He should at least do some runs to check the plug color.

 

[seruzawa]

?!?! Pressurize the float bowls? Wouldn't that cause the gasoline to shoot back into the gas tank and cause a horrible accident akin to the Hindenburg disaster? Oh the humanity...

Funny, but the ram air IV system on my '68 GTO (pirated from a '69) didn't have a pressurized float bowl..guess the Quadrajunk didn't need one...

Didn't they still use side valves and surface vapor carburetion in 1968?