85cc monkey bike upgrade to 110cc? Will it work

A place for Monkey Bike and Mini Bike (including Grom/MSX) enthusiasts. This will be moderated in accordance with C90Club rules. Welcome!
Monkeysteve
Posts: 11
Joined: Fri Jan 29, 2021 11:50 pm
Rides:: Ktm 300

Re: 85cc monkey bike upgrade to 110cc? Will it work

Post by Monkeysteve » Tue Feb 02, 2021 9:59 pm

I’ve done the rebuild today, starts first kick but won’t Rev up past 4000rpm? Runs fine up to that point and just sits there and bogs on full throttle then will come back to tick over ok? Do you think jetting or something else? Doesn’t seem to be leaking anywhere and everything torqued down properly. Any advice on jetting? Thanks again

Monkeysteve
Posts: 11
Joined: Fri Jan 29, 2021 11:50 pm
Rides:: Ktm 300

Re: 85cc monkey bike upgrade to 110cc? Will it work

Post by Monkeysteve » Wed Feb 03, 2021 7:32 pm

Fixed now. Valves needed adjustment. Any advice on correct jetting?

User avatar
wightegi
Posts: 9710
Joined: Tue Sep 01, 2009 7:23 pm
Rides:: 12v 1988 e start C90,Royal Enfield Interceptor 650
Location: Isle of Wight

Re: 85cc monkey bike upgrade to 110cc? Will it work

Post by wightegi » Fri Feb 05, 2021 9:48 am

The larger capacity will suck more so smaller jets maybe in order. Diesel Dave has a section on jetting LIfans which would be worth reading .

viewtopic.php?f=20&t=30162&p=278481&hil ... ng#p278481

or put Lifan 110m jetting in the search box.

User avatar
Barnsey
Posts: 187
Joined: Fri Aug 11, 2017 12:31 pm
Rides:: Honda C50 BMW R100
Location: Portsmouth, Hampshire

Re: 85cc monkey bike upgrade to 110cc? Will it work

Post by Barnsey » Sun Aug 08, 2021 12:59 pm

I was recently advised to put a #83 main jet in my Lifan 110 powered cub replacing the #75 which the carb came with. I will be testing this out this week hopefully, showers dependent.

Post Reply