Carb Jetting

[Smithjs35]

Considering jetting differences, is there a horsepower or mileage difference between a euro jetted verses a usa vmax ?

 

[Fire-medic]

I'd go with USA spec, but either 150 or 147.5 Mikuni main jets for a stock insides motor, with either Morley's Muscle or Dynojet Stage 7 and a complete known quality full aftermarket exhaust. Not a Cobra 4-into-4! A quality synchronization (gauges are relatively inexpensive) and remove the aluminum plugs and tune the air bleed screws after the synchronization.

 

[Smithjs35]

Thanks Fire medic, just curious why euro's are jetted differently. And I have stock exhaust. Ditched the cobra's. Sean was right of course, totally different bike. Mine had an idle issue but it seems to have been caused by improper a/f settings, probably from the cobra's.

 

[MaxMidnight]

Not all European bikes had the same power output e.g. France (and others?) were restricted 10 100 hp and the jetting between markets may be different.

 

[Fire-medic]

The Cobra 4-into-4's look cool, but they are a soul-sapper in terms of what the bike's target audience is, performance cruiser aficionados. Every Cobra equipped bike I've ridden feels like a spark plug lead has been disconnected. No VBoost surge like a stock exhaust, properly-operating motorcycle. Flaccid throttle response. On top, less power. That's quite a compromise for the looks. If you want looks and performance, get the UFO Quad-Zilla 4-into-4 or the Star Rider Performance version is. I'm not sure if Sean Morley offers something like that.