1972 ct90 Lifan swap

-Nate

Active Member
Wow ;

You're persistent, I like it .

The primary deal here is : they sold you the WRONG ENGINE ~ Lifan also makes and sells engines that match the bolt holes .

How is it now that you're riding ? .

What CC is the engine ? .

Add a rare earth magnet to the drain plug or buy a magnetic oil drain plug from 4into1.something....

RIGHT NOW you need to stop and check the valve gaps, they go to .002" engine cold and set to the 'T' Mark .

Then get it good and hot and do another oil change, allow the oil to drip out over night, a picture of the metal would be good but usually it's just left over machining SWARF from lazy communist workers not doing their job .

Most I've met who go the Lifan route like them but don't ride them as fard / hard as the die hards like me ride / run out old stockers so I'm keen to learn how this works out for you .
 

Tuuubbs

New Member
Nate, I don’t know that it’s the wrong engine. The bolts all line up now, I was overthinking everything at first. It’s a Liffan 125 from t-boltUSA. The engine came with a magnetic drain plug and pulled out a fair amount of fine shavings, nothing major, I also wiped it and held it under the draining oil and no more shavings stuck to it.

It rides great now that I’ve got the new tires and clutch dampers in. I took it to my work Monday and rode it around in our piles of old asphalt from a parking lot we tore up, I stalled it a few times but I was able to crawl quite well just riding the clutch in first gear. I’ve gotten it up to 40mph without being full throttle. I don’t have tags, title, bill of sale, or a motorcycle license, so I’ll have to find some long straight I can ride worry free to test top speed.
 

-Nate

Active Member
EXCELLENT ! .

I was wondering , some Chinese engines have the earlier bolt pattern and so are wonderful for dropping into your dead 1962 C100, 102, 105 etc....

I thought that's what you were dealing with .

Depending on what state you live in, licensing can be easy or bleeding hemorroids .

What clutch dampers ? .

The SWARF is normal, run it 500 ~ 1,000 miles and hot change the oil again and remove the clutch cover and clean the oil intake screen, it'll have more SWARF and some clutch fibers in it too .
 

WarnerSteel

Active Member
EXCELLENT ! .

I was wondering , some Chinese engines have the earlier bolt pattern and so are wonderful for dropping into your dead 1962 C100, 102, 105 etc....

I thought that's what you were dealing with .

Depending on what state you live in, licensing can be easy or bleeding hemorroids .

What clutch dampers ? .

The SWARF is normal, run it 500 ~ 1,000 miles and hot change the oil again and remove the clutch cover and clean the oil intake screen, it'll have more SWARF and some clutch fibers in it too .
I’ve been building bikes with aftermarket engines, mostly Lifan’s, for 20 years and have never seen one with a engine mounting pattern that wasn’t standard for the 70cc or smaller Honda’s. The C200 and CT200 are the only 90cc bikes that are coming to my mind that use that same bolt pattern. Most 90cc bikes use a different pattern and the aftermarket engines are not a direct bolt in. You’ve seen a Lifan that will bolt into a CT90 without mods?
 

-Nate

Active Member
O.K., may bad - post # 42 indicated he used the frame holes, .

I have seen quite a few Lifan conversions that don't use brackets .

I have never done one so who knows ? .

You're prolly correct .
 

Tuuubbs

New Member
I’ve had a few friend tell me that since there’s no electric start on this bike, I can just hard wire the electrics. They said I’ll need a converter but it should be easy. Any negative side effects of this?
 

WarnerSteel

Active Member
I’ve had a few friend tell me that since there’s no electric start on this bike, I can just hard wire the electrics. They said I’ll need a converter but it should be easy. Any negative side effects of this?
What does “hardwire the electrics” mean? Are you trying to get lights to work? If so, what wiring harness are you using on the bike?

I prefer to use a new harness that is designed for the 12v engine. Trail Buddy sells two models: one for use of turn signals (part #TB422) and another if you’re not using signals (part #TB515). I also suggest swapping all bulbs to 12v.
 

Old Guy Too Many Bikes

Well-Known Member
I’ve had a few friend tell me that since there’s no electric start on this bike, I can just hard wire the electrics. They said I’ll need a converter but it should be easy. Any negative side effects of this?

Just because it doesn't have electric start, you don't get a free lunch. You still have to wire it up using one of the lifan / generic Chinese wiring diagrams. The only easy way out is if you're putting it in a pit bike or off-road bike, where you don't need any lights. In that case, you don't need to wire the charging system or need a battery or regulator. The flywheel and CDI box powers the coil and plug.
 
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