sister-sister

[zombie]

Maybe air trapped in the top of the Jug? Maybe just one size too lean? After break in they will rev free needing more fuel. If it's mainly the pump tho I would think bearing.

[wordslinger]

..josh rebuilt the water pump as well...

..i may go up a jet, just to see if its cooler... but plug looks gooood...

..br8hs plug...

[zombie]

Even New bearings can be bad. Give him a call for advice.

[wordslinger]

..yeah, figured i'd hit him up 2moro...

[Areomyst]

You can drop down to a BR9HS plug.  It is going to be hotter, because the Prima cylinder uses pretty much the same size water jacket as the 50cc cylinder, with a bore that's bigger.  Also the high compression ratio makes it run warmer.  You could swap the cylinder heads (not the whole cylinder, just the head) and you'll probably notice cooler running.

Can't be as bad as the Rotax engine in a Scarabeo 150 that I have in at the moment... got so hot it melted the dipstick, water pump impeller, and even started working on the timing chain guides.  Heh. 

~Josh

[wordslinger]

..thanx josh, i had thot that the 9 plug might be better...

..it's just that i ride this girl for long stretches..

..and with what you aready said about those primas...being basically oem bored-out, i figured that might be th case..



..warmer weather is making things a bit hotter...probly have to order that ngk9....

[zombie]

How about a fan? Maybe computer parts, or something from a Honda maybe? Or drilling the shroud for more air flow?
Are you guys talking about adding a wc head?    Sooo many questions... Soooo little time.

[thebatman]

Are you guys talking about adding a wc head?    Sooo many questions... Soooo little time.

Bertha is already W.C.  
that one has a bbk with a modded/bored oem head
OEM pipe....carb

Speaking of which... I found a Naraku bbk cheap but w/o the head... i wondered how that would work out using a regular W.C oem head..(that would get my s9 back up  , still no word from Rage on the bbk he was selling........sobbing.. )
I know Shaka had the oem head on his zx at one time, of course it's A.C

[zombie]

The only issue is using an ac head you have to use a plate to seal the wc jug.
Or I guess you mean an ac S9!

[Shaka]

I know Shaka had the oem head on his zx at one time, of course it's A.C

I did...that was the first Airsal BBK I had on the ZX.  The domed piston with that kit is machined flat around the edge so the piston doesn't hit the oem head at TDC.  It worked great after I made the base spacer to give me the correct durations/squish.

[thebatman]

Or I guess you mean an ac S9

Na, Bertha is L.C..
She had a oem l.c head, bored out to 47mm combustion chamber from the oem 39.


Mine WAS L.C.
Poor thing dead beside the z.       
I found a oem l.c head in canada(1/2 $ from new) and that Naraku kit would fix mine. Wouldn't be a malossi kit.   But she'd run again. 

[thebatman]

Hey Shaka..
Yeah i remember you had good sucsess with that set.

[zombie]

I just saw a flash of the dead... Kits. All the dozens of fallen kits. Here's to the Fallen Kits! HIP HIP

[wordslinger]

          ..riddle me this, cause it seems i heard someone say it...

..relative excess 2t oil simulates or creates a "lean" fuel mix condition??

                                           

[zombie]

YES. It actually takes up room in the jets that fuel should be going thru. It Dilutes the fuel as it were. Jetting IS dependent on fuel/oil ratio. Change the ratio, and you need to re jet...