Getting the most out of a 125

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ChesterC90
Posts: 38
Joined: Mon Mar 20, 2017 10:01 pm
Rides:: C90 and Lambretta

Getting the most out of a 125

Post by ChesterC90 » Fri Oct 06, 2017 8:53 pm

Finished my cub project
125 Lifan: Kepspeed exhaust:
Open mouth filter: 120 rear; standard front: 16^39 sprockets.

Very nippy in all gears, but top speed of 44mph, less than the 90!

Any tips? Engine just run in...

Cheers

culfy
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Rides:: several honda c90's c70 and c50, lambretta li special puch and a honda cbf
Location: sheffield

Re: Getting the most out of a 125

Post by culfy » Fri Oct 06, 2017 9:34 pm

What carb ?

ChesterC90
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Joined: Mon Mar 20, 2017 10:01 pm
Rides:: C90 and Lambretta

Re: Getting the most out of a 125

Post by ChesterC90 » Fri Oct 06, 2017 10:19 pm

Standard 90 , 19mm I think

culfy
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Joined: Thu May 27, 2010 2:47 pm
Rides:: several honda c90's c70 and c50, lambretta li special puch and a honda cbf
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Re: Getting the most out of a 125

Post by culfy » Fri Oct 06, 2017 10:29 pm

That might be the problem , if you go in the search bar and look up what others have done , you will find that most find the standard carb a bit restrictive on the 125 engine , I’ve got a molkt on my Lifan 125 and it goes like stink .

ChesterC90
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Joined: Mon Mar 20, 2017 10:01 pm
Rides:: C90 and Lambretta

Re: Getting the most out of a 125

Post by ChesterC90 » Fri Oct 06, 2017 10:37 pm

Cheers Cuffy.

I've got some 22, 26 and 28 carbs.

What mm' is yours and what sort of top speed are you getting? I'd like 50 +, just for dual carriage way riding,

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Bogger
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Rides:: yamaha V90, 2 x C90, YBR125, BMW R1200st, Piaggio BV350
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Re: Getting the most out of a 125

Post by Bogger » Sat Oct 07, 2017 7:59 am

ChesterC90 wrote:
Fri Oct 06, 2017 10:37 pm
Cheers Cuffy.

I've got some 22, 26 and 28 carbs.

What mm' is yours and what sort of top speed are you getting? I'd like 50 +, just for dual carriage way riding,
Best put it back to standard then :lol: :lol: :lol: :lol: :roll:

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JohnS
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Rides:: 1970 C90 fitted with 12v 110cc Lifan engine.WK GTR300 scooter(copy of SH300)
Location: Rugeley,Staffordshire

Re: Getting the most out of a 125

Post by JohnS » Sat Oct 07, 2017 10:33 am

You say "very nippy in all gears",so your problem could be gearing.I ran an 18 tooth front sprocket on my 110 Lifan which gave it a top speed of 50 to 60 mph depending on wind,with 47 mph in 3rd.18 was the largest that would fit on the 110.Pit Bike Spares sell them,but check they will fit the 125 shaft.

ChesterC90
Posts: 38
Joined: Mon Mar 20, 2017 10:01 pm
Rides:: C90 and Lambretta

Re: Getting the most out of a 125

Post by ChesterC90 » Sun Oct 08, 2017 6:10 pm

Does a tight chain hinder? I admittedly cut mine too short, which is a bit too tight, but with enough play to work.
Tempted to add another link with a clip master link, but concerned about the safety of running 2 master links. Hoping that with the 90's relatively low speeds, it won't matter.

Any thoughts???

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Bogger
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Re: Getting the most out of a 125

Post by Bogger » Sun Oct 08, 2017 9:30 pm

Yes it does matter. Alter it and see what happens

Bogger

ChesterC90
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Joined: Mon Mar 20, 2017 10:01 pm
Rides:: C90 and Lambretta

Re: Getting the most out of a 125

Post by ChesterC90 » Thu Oct 12, 2017 9:19 pm

Slackened the chain (new) tried various front sprockets 15 16 17 and it still tops out at 45.
Which is a bit frustrating because I bought the Lifan for 4th gear and to get up to 50+ to stop getting bullied by f@ckin considerate car drivers on the occasional but unavoidable by pass travel.
Only thing I can think is the carb , it's still the standard 19.
Bigger can you add a 4th gear to a c90 engine?


Cheers

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