doing head, 54mm zongshen

[china boy788]

hmmmm i dont think it does, but ill recheck in morning b4 i ask about it,, thanks for all the help, if theres any thing else, ill repost up,, and ill post pics when done,,

 

[sean01]

well it would be if you had a lifan or yx, but ducars are next in line for being good engines.

what makes it hard too is that fact that all the good parts come from oversea's so really you only get one bite at ordering bits as most wont exchange

 

[DvDRip]

ah fair enough, uncommon engine

 

[china boy788]

ducars??? its a zongshen?? are they the same ??? i have a 125cc ducar as well too

yer i know wat you mean with the good parts

 

[sean01]

oh its zonger... could of sworn you said ducar somewhere... i think the 54mm zongers shared pretty much the same sht as lifans....but anyways your on the right track regardless of the breed.

ill have to admit tho, i was a little put off when you said the valve size cause ducars had small valves i think...

 

[china boy788]

ha ok yer, havnt seen the inside of lifan 54mm but probby the same,,

if what i bn tolled about the triangle thingy on head (ill show pic soon) thats a BVH too <-- the ducar 52mm

 

[china boy788]

 

[sean01]

never really taken any notice to be honest, ill sus it out with the heads i have

 

[china boy788]

lol ok, jst some thing i saw in another thread, and jst take that in.. thanks for help

 

[china boy788]

ok got some new pics uploading atm, its got the cleaned head and lil port job, its not done yet, i jst have to sand it smooth, is that a good idea or jst leave it the way it is???

 

[sean01]

depends how rough the surface is... you want the surface to have at least an 80-120 grit finish.. the exhaust port you can polish

 

[china boy788]

80-120 grit??? dam i jst went and got 400,800,, will 400 work?? or too smooth?

 

[china boy788]

one just to show how clean the head is now,

will post up more when they upload

 

[sean01]

the biggest benifit you ll find is match porting the intake port to the manifold..

 

[china boy788]

yer, will do that nxt, the manafold i have atm is only 24mm but i got another one thats 26mm ill jst give a lil sand and throw on,,

 

[china boy788]

what does every one think of that??? smooth up a bit more or jst leave it??

 

[sean01]

no, thats looks good....have you only done the inlet?

most power is made out of opening the exhaust port

heres one i did quickly the other day
the first pic is the exhaust port, notice i have taken it right out to the exhaust gasket

 

[china boy788]

ok sweet, ill do the exhuast tommorm, and finsh up the intake one near the valve opening,

did you take out the bolts when doing exhuast, i cant get the bits in there without it hitting them,, or is there another way around this?

 

[themountain]

[

what does every one think of that??? smooth up a bit more or jst leave it??

Don^t want to bust your bubble , but that looks horrible....the intake should have a ruff but equaly surface, the area aside the Valveguides should be smaller or not existend ...take a good look at sean^s pics...and read carefully again the http://www.miniriders.com.au/motor-tutorials/6959-porting.html?highlight=porting
thread, before you abuse the exhaust port..from the head as it is do not exspect any gains!!....I know, sounds harsh, but it is the reality

 

[sean01]

he's basically just cleaning the port wall sides up(de-burring it)...from the pictures he hasn't taken a great deal out.
and also this is obviously his first attempt, so from here on in he can only improve...