How big is too big??

[phlat65]

so in 150cc trim, you say it is a good compramise to a wr250?

[bdalameda]

No - more in between an XR200 And an XR250 Honda. Faster than an XR200 or CRF230 Honda.

[DAVID THOMPSON]

ALL I WANT FOR CHRISTMAS IS A TURBOCHARGER FOR MY RT125


PLEASE PLEASE TELL ME WHO MAKES ONE
IF SOMEONE DOES

[jbthumper]

No - more in between an XR200 And an XR250 Honda. Faster than an XR200 or CRF230 Honda.

hey if it's good enough to compete with an xr,
i'd be more than happy....

so let me get this straight.....
What I need is:
150cc piston
remap CDI(to 13 000rpm,right?)
Porting to be done on intake and exhaust
jetting(no need to change the carb do i??or should i?
re-bore(i don't need new sleeve,right?)
new end can

did i miss anything??
i can still use the stock valve,right??


Hey Dave,
i didn't know there is a turbo-charger for small cc bikes??
i've heard of big bikes.....
is it real???or possible??

[DAVID THOMPSON]

THE FLAG BELOW MY SIG IS
TO GET THE EYE OF THE GUY THAT
KNOWS IF A TURBO IS MADE

THEN I WILL PROBELY HAVE TO SELL THE
SAXON TOUR AND THE NISSAN TRUCK TO RAISE
THE NEEDED CASH
OUCH $$$$$$

[bdalameda]

Haven't found any turbos rated for smaller motors - have looked for one for a couple of years. I've been told that a turbo isn't efficient on small bore engines due to exhaust pressure issues with too small an engine. I was also told a supercharger would work fine!! I realllllly had no luck finding a small supercharger.

Sorry - No further ideas!

Tried contacting the German company that sells the large carb kits and CDI units wth the REV limiters set to 13,200 rpm. No response - Maybe no English speakers there. Any idea where I might obtain the CDI units with the REV limiter set higher here in the USA.

Thanks

[DAVID THOMPSON]

try these guys

there the uk parts importers for mz

http://www.bsa-regal.co.uk/

they may be able to help you find stuff

ar dave

[mxsteven]

The archive message alive again...

Well of all the experiments, now i have modded my bike with a 150cc kit which is DIY... i also noticed that the water jacket is very narrow... and my head gasket patched with gasket glue to prevent some water leakage.. the carb jetting is a big problem in malaysia coz there are no choise for pilot jet and only some choise for main jet... so now my idling was sucks.... this coming saturday will change my carb to a mikuni 28mm flatslide carb... power wise is great which i admit that the power is better than XR200 but torque is lower than xr250.... the bike easily can touch 150kmh... my sprokets setup for front is standard 16t and my rear is 49t.

so what i need now is the advise from those guys who had done their bike to 150cc. Is there any problem? side effect or anything else to be caution?

regards
MXsteven

[DAVID THOMPSON]

the kit sold here went away with the mzna importer but piston was a wisco
and used a steel liner but i want to see if i can do a conversion to my spair engine and have the lining redone at a shop that does a friends ktm
and not use the liner make it like oem but bigger piston

and how did you come out on the home made pic cdi unit

[mxsteven]

the homemade CDI unit is perfect but the only thing is the remapping.... i need to copy the original remapping and re-edit it... Now i just shifted to a new home, so when everything is settle down i will continue my r&d... later i will show you the circuit improvement coz there is still plenty of bugs wiggering around but first i have to get done my carbs then i will proceed further to improve...

the original CDI i have removed the silicone and see through inside which the board is 2 layer with smd components. Very complicated as i can say... certain part in the circuit is useless as i really dont know why they do a stupid looping back current for nothing... and the thyristor in the original CDI will not last long coz it is a very small thyristor without heat sink. As the thyristor gets hot and there is no heat distribution/transfer thats why most of the CDI kaput so easily...

i will try to re-design all the bike circuit which in a cheaper cost ....
My second attempt is to replace the meter panel with those have RPM (12000rpm), Speedo and temp meter indicator.

Will update once everthing is done... estimated after Christmas

ohhhh by the way I WISH EVERYONE MERRY CHRISTMAS AND A HAPPY NEW YEAR. God bless may your bike unleashed the power of XR250.....hahaha

regards
MXsteven

[DAVID THOMPSON]

when you get it done keep me informed as i have a spair motor i need
cdi systen for all that is on motor is genorator and the pickup for the cdi

i have a voltage reg that works

and i like this
Where u go, it's up to u,
Where u ride, it's in ur hand,
What u think, it's in ur mind,
Think b4 u do, Ride safe.

my Father always said "turn on the brain befor you turn on the bike"

my best loved bumper sticker is :HANG UP THE CELL PHONE AND DRIVE!!!"
ar dave

[mxsteven]

I kinda love this sentence....

"turn on the brain befor you turn on the bike"

huhhh when i say "sentence" i remember a movie "MIND YOUR OWN LANGUAGE" Ranjit Singh answer the exam: What is "sentence" and he answered "you will have sentence before you go to prison"
haha old times...

Lol Back to the topic (geezzz it just sway out of the topic)
Dave could u tell me what is your spair engine specification and what is the rpm advance and retard rate? and if possible mail me the CDI connection diagram of the original one.... i might have 1 cdi can use for your bike.... and dont forget pls let me know the original max RPM.

Regards
MXsteven

[DAVID THOMPSON]

standard mz 125cc motor same as bike i have

[mxsteven]

yup later when mine is done then i will let u know..

regards
MXsteven

[Tom T.]

Hey guys!

Time to put in my 2 cents worth: I have a 2003 RT125 which has some 7000+ miles on it. It is the U.S. edition, black, and has had a 150cc kit most of its life.

I have been fortunate enough to have had some close connections with what MZNA did on these kits. They originally experimented with both 150 AND 200cc kits. The 200 was never produced, but I did see it, in the company of a friend who was an experienced power boat racer. His first comment was that in his opinion, to make the 200cc kit work (stop blowing head gaskets), it should be 'Decked' as in 2 stroke motors: i.e. Give the top of the cylinder more support.

Most people are not aware, there were TWO iterations of the 150cc kit made: The first one (of which I suspect there are still a few on shelves) was a head gasket blower. I know 'cause I had one, and blew gaskets about every 300 miles. One time it blew so bad that the entire contents of the radiator migrated into the crank case.

The second iteration of the kit used the same Wisco piston & rings, but the cylinder was lined with a Nikosil liner. Not only was this a better liner, but the method of fitting it was much more accurate, and tighter. We had established that the cause of blown head gaskets was due to the liner 'Rocking' back and forth at the top. THis was confirmed by a British machine shop that one of our group sent his Mk1 cylinder to.

I have probably done in the region of 5000 miles on the Mk 11 kit, with NO PROBLEMS whatsoever! I regularly flog the hell out of the little bike because it is so much fun! The 150cc kit gives it the performance that you would wish for in a 125, but is not over the top.

My bike has the kit, a Mikuni 28mm 'Flatslide' carb (from that EXPENSIVE German company), and a Ninja pipe (manufacturer unknown to me). There are no other motor mods except a 15T front sprocket. This allows me to use 6th gear at our lower speeds in Bermuda without lugging too badly, and doesen't make 1st too racy at starts.

The bike performs so well in the stop & go mode that the chassis faults become apparent: Mostly suspension and damping (the chassis itself is very rigid).

Before anybody starts thinking that my opinions are 'Bermuda-Centric', I must add that I've owned 3 Harleys which I have kept U.S. based for the last 10 years. The present bike is an '05 FLTRI Road Glide which has covered 18600 miles through the U.S. and Canada in the last 18 months. A short ride for me is from N.E. Florida to New Hampshire!

I hope this information is helpful to several of you, and I can be reached by PM if anyone has further questions.

Regards all, and Merry Christmas.

Ride safe,

Tom T.
Bermuda