Bzm

[SIKKO_X2]

hey guys,
in the long run, i want to chuck a full bzm motor in either a z1, d1 or banshee. and i just have a few questions.
1.how much do 620 cases usually cost?
2.is it cheaper to build my own motor or buy an already assembled bzm motor?
3.if you have a bzm motor that you built, how much did it cost you?
4.what would you recommend for a setup while spending as little as possible?

cheers

[Glen]

howdy, ive spent a tiny less then a bzm motor and i have a complete one with stock crankcases + carb and exhaust.

ive personally had a look at a 620 case and i dont think there worth the dollars over a stock crankcase. they still have many places you have to clean up. i put a link up to a french site with some pics.

dont put it in a dreambike. although there rockets and handle like a dream they like to crack and die if you stack it.

the D1 is probably the best bet if you can get one. or the banshee. each id say to be about the same quality.

As for setup i like the 40cc exhaust pipe on the 50cc motor. the power is less "peaky" yet i think still keeps the same power. i.e. much smoother spread of power across the rev range.

polini cranks are cheaper then the bzm ones and are just as good. $250 at maylands at the moment!

as for clutch depends how much you weigh. ive got the 2 shoe with the light backing plate, im fairly light so it revs up and bits hard. if your a bit heavy the zocchi 3 shoes probly the best.

dont forget the good old polini 5 port either they cost half of what a bzm headkit costs and ive ridden a 5 port banshee and it rips your arms off. totally comparable to the bzm!!

love to hear opinions from others too, as im still fiddling with my motor

[SIKKO_X2]

yeah i wasnt keen on getting the 620 cases, thats y i asked how much they were.
ill take a d1 and a banshee for a ride and see which one i like the handling of more.

so a stock crankcase, either bzm or polini top end, genuine del (which one would you recommend?)

[WBR #2]

hey glen not sure what crank case your looking at but bzm 620 crank cases are one of the best as for stock case if you mean chinky ones then there is no comparison and i know as i import bzm gear my self but if you want good power on a budget i would sagest polini rep motor with bzm red crank, 6port bzm polini head, bzm carbon reeds, and delorto 19mm carby wich would set you back about $1100 thats with the polini rep motor. build cost would be extra

also polini blue cranks are good but they are only a stuffer crank where as the bzm red silver and gold are stroker cranks as well

[Glen]

Pocket bike magazine. Le 1er magazine Web entièrement consacré à la pocket bike! 100% minimoto! - Autopsie d'un BZM/Bloc 620

id be pretty pissed off if i spent $270 on a 620 case and it had that amount of port matching issues and casting flash all over it. if you can confirm theyve fixed it ill be grabbing one soon

curious about the stroker setup of the cranks though, how do you go with port timing issues + squish if the stroke is increased any? im already running .48mm squish and the piston top is level with the bottom of the exhaust port - any more than that id say would be pointless right, so do you lower the bottom of the exhaust port or something?

cheers.
Glen

[wbr]

hey mate we have done a couple of bzm & polini's all you do is get your timing were you want it and then set the squish by maching of the top of the barrel crank should not make a difference in timing or if your not really botherd with timing to much then you get your squish to the normal like 0.5,0.4,.03 etc and the timings will be the same (should be) lols because your conrod is longer you need more clearance betwen the head and piston because your adding lenth so if you have a non stroked engine say a bzm stock 39.2 and on the stock crank engine your squish is 0.3, if you then stroke it 39.6 all you do is set the squish the same 0.3 and your timings are the same the conrod is longer so it will not come down further so timnigs will be the same hope that makes sense i suck at explaining things if i had paper and pencil it would be easy

[Glen]

very true, i imagine youd need to run a shyte load of base gaskets though right? im running all of them that came in the kit - 4 and just have the squish and port timing right for the polini crank.

although in that case what is the point of having a stroked crank? arent you just moving everything else (including the port timings) up a few mm in order to keep the same squish setting.

[SIKKO_X2]

hey guys,
im thinking i might get a bzm motor off pocket racing bikes for $1400, or pay an extra $100 and get the dm?
what do you guys think?

[wbr]

not a 100 percent shore but with 4 stroke's the longer the conrod stroke the more torque you get so i guess it works the same way plus the more piston movement up and down mean's it suck's harder and compresse's more in the crank cases, and yeh i used a few base gaskets with mine originally i had two in there (the bigest one's ) and it was hitting, but the crank thats in mine is even longer again its 39.8 were as most red and silver stroker cranks wether it be polini or bzm are 39.6 hey sikko mate id buy the dm because having a euro bike is way beter than having a stiking hot engine!!! in a chinese frame lmao

[Glen]

very true i think youll find that bike to go very hard even with a 3 port. and youll have that bike long after the chinese ones have fallen to bits.