Walbro WJ501

[msp4662]

So I want to use a walbro carb as there about the easiest to tune and work great so I'm curious is the WJ 501 the size I want as I would like a bit more performance.

 

[Chainlube]

You better tell us what you're putting it on first.

 

[msp4662]

Sorry didn't realize I didn't mention what it's going on. 66cc with a dio reed and trenched cylinder maybe a performance pipe.
A just noticed they come stock on a 90cc chain saw

 

[Chainlube]

Walbro's are a pulse pump, where are you picking up the pulse from? That whole cylinder won't work very well without the pipe, definitely need that. https://www.amazon.ca/FLYPIG-Performance-Exhaust-Muffler-1PE40QMB/dp/B0796PTL5L/ref=sr_1_19?dchild=1&keywords=scooter+exhaust+pipe&qid=1601301194&sr=8-19

 

[Akutey]

I did walbro long time ago.

Stick with 11-16mm in venturi size. Small venturi around 8-9mm will be super sensitive on throttle and is very quick but limited at 20mph. 22mm was hard to tune and never got high speed jet to sing without idle or low end going.

Make sure you tap from the case and not the transfers for the pulse port.