[Kurlon]

Seeing as I've got a dead Lifan 141 setup... and there's always room for bench build chats...



Plot the ultimate Lifan 141 build!



Clutch/Tranny Improvements:

- Thumpstar revised 3rd and 4th gear (Closer ratio setup, doesn't help 1st though.)

- SDG shift fix kit

- TRX90 clutch basket (Direct bolt on?)

- Aftermarket alu/kevlar clutch plate set

- TRX90 clutch springs

- Ceramic bearings?



Bottom End:

- Xtreme oil sling (Makes shaved alu units look heavy. )

- Crank lightened, trued, polished and balanced for 11k RPM

- Ceramic bearings?



Top End:

- Nikasil line cylinder

- make full use of performance coatings on piston, head and cam

- Ti valve set

- lighten and polish rockers

- Ti tappet adjuster nuts

- Port and polish head

 

[T Bolt USA]

what about a new ceramic lined gpx cyliner 57mm

 

[RcWannabe]

He said he wants a nikasil cylinder, should be a ripper Kurlon

 

[rjpracing]

i would also add a takagawa inner rotor kit and a moded trx90 clutch basket and the rest sounds good but two ceramic engine bearings for a gsxr600 are $600!

 

[T Bolt USA]

He said he wants a nikasil cylinder, should be a ripper Kurlon

to do a nikisil cyl you need an aluminum sleeve ,then have it plated

if a ceramic option is avalible it would be a similar set up to nikisil



the reason most jap rides use nikisil is its lighter , stronger and slides better than cast iron sleeves



funny

i figured cast iron was dead till we started building 50's

 

[Guest]

The Ti adjuster nuts are a waste. 30 bucks on two nuts isn't worth it. Remove slinger completely. Ti valves are not worth it unless you want to turn a lot of rpms or you run less valve spring pressure.

 

[RcWannabe]

to do a nikisil cyl you need an aluminum sleeve ,then have it plated

if a ceramic option is avalible it would be a similar set up to nikisil



the reason most jap rides use nikisil is its lighter , stronger and slides better than cast iron sleeves



funny

i figured cast iron was dead till we started building 50's

I know I was not disagreeing simply saying that he has his heart set on a nik'd cylinder

 

[rjpracing]

to do a nikisil cyl you need an aluminum sleeve ,then have it plated

if a ceramic option is avalible it would be a similar set up to nikisil



the reason most jap rides use nikisil is its lighter , stronger and slides better than cast iron sleeves



funny

i figured cast iron was dead till we started building 50's

not correct you can get cast iron cylinder nikisil coated by a number of companys!

 

[Crashkid]

yeah, but why would you coat a cast iron cylinder. If you are going to do a ultimate lifan build you wouldn't want the weight or heat of the cast iron cylinder. Some things are stone age for a reason.

 

[rjpracing]

yeah, but why would you coat a cast iron cylinder. If you are going to do a ultimate lifan build you wouldn't want the weight or heat of the cast iron cylinder. Some things are stone age for a reason.

only the liner is cast iron,all i'm saying is it can be done! please explane whats stone age? alot or aluminum race engines have steel liners do you know why?

 

[T Bolt USA]

nikisil plated cast iron vs nikisil plated aluminum (like all the cr250/crf450s) vs ceramic coated aluminum



anyone ?

 

[stillplaysinmud]

TRX90 moded clutch basket where do you get one??

 

[T Bolt USA]

TRX90 moded clutch basket where do you get one??

honda

 

[rjpracing]

you buy the trx90 basket from a honda dealer then you have to make it fit!

 

[Kurlon]

The only cylinder coating I know by name is nikasil, no idea how the ceramic coating compares? Vince, if you've got pricing or other info on ceramic 57mm bores, share with me sometime. : )



I thought about ditching the oil sling, but looking at the itty bitty one on that one xtreme motor posted in some random thread I can't find... it's just big enough to provide a functional oil sling, and dats it.



And yeah, the Ti adjuster nuts are a waste... but hey, they're TITANIUM! That's like, the stuff the shuttle's made out of! When I do the short stroke motor it's going to have to rev it's nuts off, thats when I'll use them as I'll be trying every trick I know of to wind it up.



No opinions or alternate options re the updated 3rd and 4th gear sets from Thumpy eh? Figured that one would start a small conversation.

 

[Guest]

Yea I tried editing my post to include a comment on the tranny but my computer started going nuts. Anyway... wider spacing on the tranny can be a GOOD thing if you build the broad torque curve to match it.

 

[rjpracing]

what ratio is the thumpstar 3rd and 4th?

 

[Kurlon]

Dunno, site just says they 'tighten up 3rd and 4th'. : )



Accesories New Mini Bike

 

[rjpracing]

i bet its a taller 3rd and a shorter 4th? thats good for dirt but not so good for supermoto! what you need is a taller 1st gear and leave the rest!

 

[Kurlon]

Agreed, but no idea how to accomplish it... yet. I wish I could use the SCR close ratio 4 speed box but that means an Xtreme bottom end, and no primary kick.