qmb139 stroker crank and big bore question By budthatsmyrealname (Read 609 times)

[budthatsmyrealname]

first id like to say im not looking to race, just looking to have some keep up with traffic power.

after i installed a chinese brand 100cc kit on my qmb139, a moped shop i often go to says that taiwan parts are better and should go with ncy brand. he compared them in front of me and i see a big difference in the parts. i want ncy 50mm bore and head now.

also some time down the line i heard that if you go with a bigger bore you need a different crank. well i can only find a taiwan brand called hoca that makes a 44mm stroker crank. i cant find anyone selling taiwan cranks for this engine.

so heres a few questions.
-if i go with ncy head and bore, can i use the hoca 44mm stroker crank, like are they compatible? or i can only use stock or  ncy brand?
-if i use the ncy header and bore, should i keep the stock crank, or do you recommend the stroker crank?
-also i heard you gotta stack gaskets if i go stroker, is this true?

and if theres anything else you think i need to know or just some experience you would like to share with me thatd be cool, thanks

[cyborg]

Nya makes some decent parts or try taida if you have the wallet for it,,,pricey but worth the money in my opinion,,,clearly superior parts from taida,,as far as stroker cranks with a bigger bore,,not necessary lots of guys here and on other forums are putting bigger Pistons in their engines with the stock crank,,with the power increase you may want to consider altering your final drive gears,,,this is where you will gain greater terminal speed without whipping the engine