Lifan 150cc big-bore kit: Installation

Bojer

Been Around the Block
I get the impression that you have not fully dismantled the engine components from under the side covers ?

To get the cases split you have to pretty much remove all the components that are under the clutch and generator covers - clutch , centrifugal filter , primary gear , generator , gearchange shaft , sprocket etc. Apologies if I misunderstood but as Crazy suggests maybe some pics might help ?

The cases might need some persuasion to come apart as you are separating doweled joints and the main bearings from their housings but shouldn't need "force" - be a bit cautious .
 

stroker crazy

crazy as a fox
Bojer said:
To get the cases split you have to pretty much remove all the components that are under the clutch and generator covers - clutch , centrifugal filter , primary gear , generator , gearchange shaft , sprocket etc.

As Bojer says!

Also, it's a good idea to have the motor sitting on the left side when you do split it.

Crazy
 

Sunrise4567

New Member
This is getting way past my level of knowledge. Should have stopped at jets and rear sprocket!!! I may have to take it to someone who knows what the they are doing for the rest of the job.

Thanks so much for trying to help though...Even after reading through an old CG125 manual I just dont want to make things even worse than they already are....If I had seen it done before I would be more confident but I reckon I should cut my losses, before I do more damage.
 

stroker crazy

crazy as a fox
Sunrise4567 said:
I reckon I should cut my losses, before I do more damage.

It won't be easy to fix it yourself, but it is possible.

Getting someone else to do the the job may be quicker and easier, but it doesn't increase your knowledge and is probably going to be expensive.

Whatever you decide, keep us posted!

Crazy
 

ACEitup

Been Around the Block
Was one of the reasons I bought the bike,
If I cocked up, I could suck it up and buy a new part
or motor!!
Stick with it !
cheers ACEitup
 

Sunrise4567

New Member
stroker crazy said:
It won't be easy to fix it yourself, but it is possible.

Getting someone else to do the the job may be quicker and easier, but it doesn't increase your knowledge and is probably going to be expensive.

Whatever you decide, keep us posted!

Crazy
Well I have had a bike shop split the crankcase for me an inspect and clean out any remaining metal fragments from the thrust washer that was eaten.

Turns out the cam gear ate it and in so doing made some ugly looking scratches and slight bends to some of it's teeth, so a new one was ordered from Ikonik along with a washer.

With the motor checked and recheched it was put back in and when started it still has the same valve train ticking that is louder than the original barrel and head.

Adrian from 00 racing had suggsted that dowels may be missing on reassembly of engine causing the headgasket to hit the piston or the piston being installed back to front but this was not the case.

Changed oils and went for a slightly higher viscosity oil than I had been using from 10w 40 up to 15w 50. Still the same, the engine starts and runs perfectly and is quiet for the first minute or so then the ticking starts.

On the plus side I have done the front fork mod as per crazy's instructions and it works an absolute treat. Thanks for that one....Stoked.

Also found a set of various sized threaded blanking screws with a allen head for the carby manifold hole from Bunnings for about $3.50. Neat and tidy and cheap

And also cut a piece of rubber from an old bike tube and made another gasket to put under the fuel cap to stop any small leaks.

So some small wins......Hopefully more to come if anyone can rack their brain and come up with a possible reason for the louder ticking.
 

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orrible-64

Coast to Coast
mine ticks too.been searching for what changes????

still runs fine and goes well , revs hard and if it blows up...well i had fun.

will be swapping the 125 gear back on but keeping big valve head for racing at the salt lake next year. no 150cc class. Goes 50,100,125,175,250 i think.

i think that it is in the rocker gear and (guess)the washer you have fitted may not be required in the lifan motor ??? tighter clearances may have spat the washer.

have bought an endoscope to have a look in at rocker gear. will let you know what i see
 

stroker crazy

crazy as a fox
Sunrise4567 said:
So some small wins......

Glad you didn't have much damage - it could have been waaay worse!

Not sure about the ticking; the 150 set-up seems to be mechanically a bit noisier than the 125.
I've done nearly 2000k since the upgrade and everything seems fine.

Crazy
 

dahond

New Member
I've learned, from an old honda garagist, you should hear a pushrod ticking +
the clearance on the exhaust can be set a little larger : the exhaust valve gets warmer en the pushrod expands more.
My 125 ticks.
 

Bojer

Been Around the Block
Yep my Ace is "noisier" than other non balance shaft equipped 125s I've owned , nothing dramatic - did wonder if it was my "hard" run in ?! ???
 

TijmenK

Been Around the Block
I'm thinking of installing a 150 big bore kit on my Suzuki GN125 and was wondering what you think after having ridden it for a while. How significant is the performance increase?
 

stroker crazy

crazy as a fox
Tijmen said:
I'm thinking of installing a 150 big bore kit on my Suzuki GN125 …

I don't know about the Suzuki, but it's made a significant difference to the 'Ace'.

My 150 has no difficulty accelerating away from the 125 model, even though I'm somewhat overgeared with 17/35 sprockets.

I think the larger valves help as much as the 20% increase in capacity.

Crazy
 

Sunrise4567

New Member
Tijmen said:
How significant is the performance increase?
I have found the increase in performance to be just as crazy states, around the same percentage as the capacity increase. It makes a real difference in mid range torque where it was definately required. Top end gains where not as great in my experience, but my exhaust has the cat removed and a 12mm hole in end baffle which is probally washing a bit of top end speed off which is a trade off against a really loud straight through system and custom header. Like crazy also mentioned gearing, carb, jets and filters all combines to make a much more pleasurable experience.
 

ACEitup

Been Around the Block
stroker crazy said:
.
My 150 has no difficulty accelerating away from the 125 model

I can confirm that :(
still waiting for ooracing to have the 150 big bore, valve head back in stock!
a week to go I'm told ?
mean while I'm thrashing this pup!
cheers ACEitup
 

ACEitup

Been Around the Block
Hey All,
Finally got delivery of my 150 cc big bore and valve kit from ooracing !
after being out of stock for a month or 2 :(
Following crazy's guide as posted.!
As my first major mechanical job it all when to plan
and as Crazy did make it over
to help and guide me to reassemble.
and kindly supplied the torque wrench.
Ur a Legend mate !
It would of started first go but I decided to do a quick
carby jet upgrade !!!! ( ran the battery dead trying )
kicked over when I sorted the fuel
anyways all good !!
Only done a fews K's but I 'm smiling !
Money well spent.
looking forward to tweaking carby !
btw in 7 hrs we did 2 bikes, (plus my carby rejet )
including shopping for jets and oil !
Now, just need to ride....
cheers ACEitup
 

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