Bike Not Running 100% Right

[WyldOne]

Hey all,

Got a problem with my Lifan 140cc engine, it's not running 100% right and I'm still running it in!

It takes forever to start, I eventually have to use the choke, but once the bike has been fully warmed up I can start it without using the choke.

It coughs and bogs when I give it throttle and it just doesn't sound like it's running smooth. Any ideas on why my bike is being a bitch? I'm fed up with pitbikes!

 

[DvDRip]

valve clearances are out

hows the compression?

 

[WyldOne]

Thank you so much! I have no clue on hwo to check the valves, but will search around!

The compression is okay I think. I get kickback every now and then, and it is a lil tricky to find TDC.

 

[Shing]

Haha, after spending hours trying to tune one, you really do get to hate them.
But dont worry. You will get it sorted out soon enough.

 

[WyldOne]

I'm checking my valves as I speak right now.

The cam timing seems to be right on the spot. Just need to check my valves.

 

[DvDRip]

It's a very simple adjustment and is one of most important parts of pitbike maintenance

I think this is the best video showing how to do it: YouTube - How to check valve timin on Honda 50 70 cc motors

here's a guide made by one of our members: http://www.miniriders.com.au/motor-tutorials/24965-how-set-valve-clearances-horizontal-engines.html

another good one: QingQi (Qlink) 200GY Illustrated Valve Adjustment - MyChinaMoto

after looking at all those guides you should have a pretty good idea of what you need to do, good luck

edit: a bit late hey? lol

 

[WyldOne]

What size feeler gauge should I use on a 140cc engine? A .03 or .04?

 

[DvDRip]

.003 for intake .004 exhaust, not .03 / .04

 

[WyldOne]

.003 for intake .004 exhaust, not .03 / .04

There roughly the same size a sheet of paper yeh?

Mine only have .03/,04 because they couldn't fit the extra zeros in. I do have .30/.40 and they seems to be in the mm's.

 

[sean01]

mm's dont go small enough.... it has to be in thou.... .003 & .004

 

[DvDRip]

There roughly the same size a sheet of paper yeh?

Mine only have .03/,04 because they couldn't fit the extra zeros in. I do have .30/.40 and they seems to be in the mm's.

headsmess does say two sheets of normal computer paper works well

 

[china boy788]

yer two sheets is 0.004, and that will work fine