Lifan 150cc big-bore kit: Installation

Sunrise4567

New Member
orrible-64 said:
Mine got worse after motor warms up. I used stem seal from old head to repair

Ok great, now I now what to look for. Do you need a special tool to compress the valve spring to get to the seal?
 

orrible-64

Coast to Coast
Yes and no.. Can just push down on valve cap with a socket but I made this from a g clamp and old socket . Can be done without it welded together .
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orrible-64

Coast to Coast
The gap is to put retainers back in. Takes some balancing on the edge of the bench and some patience to put collets back in. Google YouTube doing valves with household items for a guide.. I made the tool and the discovery when I went to port my head. Had done a mates the day before and took mine apart and found no seal.


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sunbeam61

New Member
Finally got round to fitting the 150cc bits after looking at them for 12 months. Mine are not OO Racing but e-bay purchases at half the cost ( about A$186.00). I did a lot of research before buying. The "big valve head" is just the standard larger valve head for the 150cc motor. I also did not need 6mm/8mm exhaust studs as my exhaust header clamp was already 8mm from the factory. Only problem I had was not realizing that the aluminium crush washer can be taken out of the old 125cc head and reused in the 150cc head. Put it all together with the original exhaust and Mikuni (china rip off)set for the 125cc and it started 1st time. Only needs the carby rejected ...Now sounds even more like a real bike....LOL.
 

sunbeam61

New Member
Would just like to add ,that I found this posting 'how to' very useful ,but a little more basic type of details, for complete newbies, would have been good.
 

2b

Been Around the Block
sunbeam61 said:
Would just like to add ,that I found this posting 'how to' very useful ,but a little more basic type of details, for complete newbies, would have been good.

I'll be doing my 150 upgrade in the next couple of months and am a newbie. Am keen to read about any extra tips you may have :)
 

f3nrich

New Member
Fitted my kit last week and she just doesn't seem to be running right
The bike idles & starts fine, as more torque low down it seems, but just wont rev. It's topping out in 1st before 20 very much out of puff where the 125 would still pull and pull.
Bike has an exhaust, egr delete, cdi, jets and plug mods, was pretty fast seeing the needle off the clocks downhill.

Double checked my valve clearance, tweaked the carb and tried another bigger carb that a mate had laying about but no change...

Any ideas?
 

Erskine

Over 1,000 Posts
f3nrich said:
Fitted my kit last week and she just doesn't seem to be running right
The bike idles & starts fine, as more torque low down it seems, but just wont rev. It's topping out in 1st before 20 very much out of puff where the 125 would still pull and pull.
Bike has an exhaust, egr delete, cdi, jets and plug mods, was pretty fast seeing the needle off the clocks downhill.

Double checked my valve clearance, tweaked the carb and tried another bigger carb that a mate had laying about but no change...

Any ideas?

Yep. Go back to the original jet and try adjusting it on the needle first.
Also have you just fitted an inline fuel filter? If so ditch it! A lot of these filters require fuel to go through under pump pressure, not gravity. With identical mods mine only required richening one notch on needle.
 

f3nrich

New Member
Erskine said:
Yep. Go back to the original jet and try adjusting it on the needle first.
Also have you just fitted an inline fuel filter? If so ditch it! A lot of these filters require fuel to go through under pump pressure, not gravity. With identical mods mine only required richening one notch on needle.

Going to pop the standard carb back on tonight, do you mean the standard ace jets?
No fuel filter.
only thing that's changed is the cylinder, piston, head and spark plug. (going to try the old plug tonight just for peace of mind)

Emailed Adrian from OOracing, who despite being on holiday replied asap and recommended I try the standard CDI box.

Ill see how I go!
 

Erskine

Over 1,000 Posts
Yep standard carb standard jets. Start with needle in middle groove then lower clip to richen as necessary. Bare in mind that the 200 uses the same carb!
 

Erskine

Over 1,000 Posts
orrible-64 said:
Standard carb has no slots on needle.


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Really? Must be another cost cutting exercise! If this is the case that defo screws up fine adjustment ...
A CB/CG/XL/SL/TL needle will have for sure, also other applications of the clone motor do as well.
Worth sourcing and should only be a couple of quid/bucks/sheckles.
 

f3nrich

New Member
Well I've pretty much ruled out all air fuel and spark.
So in the process of putting my standard head on to see how it runs then.

Pretty sure it will cure as after removing the big valve head my mate had a go at it with a valve compressor and they hardly move!
 

f3nrich

New Member
Yeah after trying the standard cdi unit I put the OORacing 'blue' cdi back on.

Took her out for a ride with my mates last night and it's great, noticeably better on hills
 

Erskine

Over 1,000 Posts
If you find the time, gas flowing the 125 head and lapping in the valves will crisp things up further. Running the 125 head ups your compression ratio so thats part of your perfomance gain. If you get a dremel you can smooth the casting in the inlet and exhaust ports on the head, and remove any casting ridges. Then match the very outer part of the exhaust port to the internal diameter of the exhaust. BE CAREFUL not to take any metal away from the floor of the exhaust port further inside because you risk weakening the dome of the combustion chamber, but you can polish it up. Then keep an eye on the plug colour in case you need to adjust the carb needle.
 

sunbeam61

New Member
Crazy...Once again thanks for the article. One problem that took me a while to sort was the crush washer for the exhaust. I've never used these before on my Rootes group engines and didn't realize I could dig out the original from the 125 head and reuse it. Took a while but got it sorted.....then again doing this sort of stuff was one of the attractions of the Ace.
Now fitted a better looking taillight and a reflector that has led lights in it.
I'm running a china Mikuni 26 (22mm) 100/20 jets and just about all the mods others have done, but still original header pipe.
Went for a blast after 130km on the 150 mods and have topped out at 115 on the speedo and while sitting on 100km/h on the motorway was actually tempted to overtake..the bike felt like it just wanted to go. Now will sit on 90km/h as a cruising speed.
As I noted on the other Ace site I need info Re a 7inch headlight. Can I use a H4 halogen with the Ace wiring?
Thanks ..Chris...
 

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