Bike Carb main jet size

[Super S Dave]

How do folks, does anyone know ideal main jet size for bike carbs for a cg13de engine, its had the ignition curve advanced and has a straight through exhuast system? any help appreciated

PS anyone going to PPC in the park at Mallory?

 

[karlj]

I believe it's 1.3mm

 

[frank]

my guess would be a bit smaller than a 130 personally, but it will depend on the chokesize/carb type tho eh

 

[Super S Dave]

Thanks frank, I've got 175 main jets on mine so may be a bit rich, I'll be flooding or spitting flames!

 

[Skinner_87]

180 rich low down but good on high revs

 

[l_jonez]

Not sure what mine where but they have been drilled out to 1.55mm

 

[frank]

those are some big jets if you guys are running with filters

 

[Skinner_87]

those are some big jets if you guys are running with filters

Just stone filters mainly or sock trumpets, you thinking far too rich Frank?

 

[frank]

Just stone filters mainly or sock trumpets, you thinking far too rich Frank?

i,m not sure tbh i,m just basing it from our 270cc kart engines really, # 80 mainjet with the stock airfilter.
and most crossers run #160 ish iirc (with their huge choketube)

 

[Super S Dave]

cheers guys, im gonna get them re jetted to nearer the 130 mark, its a town pootler too so cant go everywhere in 3rd at 6000rpm! let you know how i get on, some arch welding to deal with now - joy!!!

 

[karlj]

Give bogg bros a ring they'll be able to give you more info