Avanti ex box

[Micky67keane]

Going to be fitting an Avanti ex box and 17t front sprocket at weekend(currently on Bgm v.2 and 16t).
Will I need to up my main jet?
Im running a 28mm PHBH with 118 main jet
All info appreciated.
Cheers

[Rich Oswald]

Plug chops are the best indicator of that but you could go up a couple of sizes to be safe and work your way back down.

[Micky67keane]

Plug chops are the best indicator of that but you could go uo a couple of sizes to be safe and work your way back down.

Nice 1,thank you

[bookertmgs1]

what top end have you got on ? Gear box ? Crownwheeel ?

Why increase the front sprocket size ? whats the intended result ?

You are potentially changing 3 things all at the same time - which adds a degree of complication if the results arent what you expect

[hullygully]

what top end have you got on ? Gear box ? Crownwheeel ?

Why increase the front sprocket size ? whats the intended result ?

You are potentially changing 3 things all at the same time - which adds a degree of complication if the results arent what you expect

+1

[hullygully]

Plug chops are the best indicator of that but you could go uo a couple of sizes to be safe and work your way back down.

+1

[Micky67keane]

Thanks for the replies.
Going off another thread about raising my top speed a little(and wanting a new exhaust) Im changing to an ex box,going to a 17t sprocket which should give me the extra mph required(currently 62gps).At the moment its screaming at top end.l,so going to a 17t would help to reduce that too?
Any and all advice greatly accepted.Thank you

[Micky67keane]

what top end have you got on ? Gear box ? Crownwheeel ?

Why increase the front sprocket size ? whats the intended result ?

You are potentially changing 3 things all at the same time - which adds a degree of complication if the results arent what you expect

I have an RT195 and 46t crownwheel with pacemaker box.

[Toddy]

I would try the exhaust first before changing anything else you will know then if you need to alter the gearing

[bookertmgs1]

what top end have you got on ? Gear box ? Crownwheeel ?

Why increase the front sprocket size ? whats the intended result ?

You are potentially changing 3 things all at the same time - which adds a degree of complication if the results arent what you expect

I have an RT195 and 46t crownwheel with pacemaker box.

Ok - with the Pacemaker gear box & 17T would make it very similar to LI150 & 16T which should suit the kit.

Dont forget you are likely to need a new chain too.

On a standard RT Kit you should expect another 5mph flat out - but nothing revolutionary