250-500cc New project

Ordered a 71.5mm piston today when it arrives I'll send it and the cylinder to Electrosil in Melbourne so I will have a pretty good engine when done.

You dealt with electrosil before chilly? I've heard conflicting reports but never had any work done by them. Bloody expsenive I know that!

Have used them a few times Shawry since they are the only buggers who do the whole nikasil plating and with the weak AUD, they know it too. A mate just recently sent his 450 cylinder to be redone in NZ and that worked out to be cheaper (http://www.nzcylinders.com/) but the quality is every bit as good as electrosil.

Yeah last time I looked it was $600-$700! Will have a look at nzcylinders too. Aurum plating down your way OMG are no good apparently. Still work out cheaper to send stateside to powerseal!

Aurum Plating is in Qld l think? Keep hearing Powerseal is great and inexpensive but l would have thought the weak AUD would have made it prohibitive?

Wow with the price you guys are being pillaged, it is probably cheaper to send stateside.

$184US i got quoted jus this am. Say $120US postage there n back still only $400AU! With matched wossner piston n little end bearing another $200US so say $650-700AU tops with matched piston ready to go. Mob in NZ quoted $400+ plus postage both ways so say $100-$150AU so $550AU total. Wossner piston kit n little end $200-250AU so $750-$800. Easier to get it all from one place n perfectly matched plus save me $100(that's 2 cartons plus a bag of pistachios!)

I was quoted $500, I'll go with them for the sake of convenience. I'll let you know how it goes.

Wats it cost in postage within Australia chilly?

To much in my own personal experience!

Yeah wen it's due jus send it to powerseal again me thinks!

And today's questions are how the %#@X do I get the water pump impeller out to change the seal?

Second question is the original carby is no good but I have a used minkuni flat slide that is the same size, what would be a good baseline jetting spec, pilot and main?

Hello!
The impeller is reverse threaded on the shaft. You need to heat up the impeller and cool down the shaft to unscrew the impeller. Be careful and good luck...

Electrosil did a great job on the cylinder, it looked brand new! Just have to save a few pennies to get a new ignition system and get suspension sorted and will be good to go.

Not a big fan of the Dellorto...unless you are VMX racing, l'd ditch it for a Keihin or Mikuni - something that you can easily get parts for!!

Ok the saga continues. Engine is back together, I have spark, new mikuni flat slide from mikuni oz jetted to suit but it will just not fire. Any suggestions and Yes I made sure the ignition went back in exactly the same position. Will not start with the carby that it came with either.

Forgot to mention I need it running by next weekend as Frank Ponns is coming to rebuild and set up the suspension.

Right you've got spark that's a start.
Air way isn't blocked? You didn't stuff a rag in the hole to stop anything getting in did you.

What are the symptoms did she kick over fine or is she a mule, who set squish.
Are you kicking over with throttle open or closed and with cold or off.
There's alot of variables we are all in the dark too.

Go through the list of your starting routine and post it up maybe we can spot something.

No rag in airbox, even checked that piston is in the correct way. Have tried all throttle settings, choke on and off.

General try to start with no throttle but choke on sparkplug is new, has never kicked back or blown back though air box. Squish was not set, assumed it would be close enough. Kicks over fine, good compression.

Ok well I would check your squish, plug gap and plug cap.
Make sure you don't have a suppressed cap with suppressed plug.
That's the simple one also the gap should be half a mill a bigger gap does not make a bigger spark it makes a weaker one as the energy required to span the gap increases the further away it gets.
If those are fine I would do squish test my method it to remove head put play doh or plastercene on 4 points of piston put to lower end of stroke with oil on the top of them then replace head an kick over twice. Un do head remove plastercene and measure all 4 then you've got the amount of squish.
Check with the book or online for your requirements.
Adjust base gasket suit the clearance required.

If those don't work then I'm guessing you need to re time the thing, is it possible you installed the stator 180deg out?