Kymco ZX50

[Shaka]

Will that give you a 1.37mm squish then?  That's not really all that bad.  I'm currently running a 1.18mm squish at least until I get a spacer made.

[sidthesloth]

That is if I use a gasket, I still have two gaskets to play with, if I need a larger squish I will go for it, whatever it takes, just not too much money. :-)

[sidthesloth]

Sorry about the late update, I put the 1mm spacer in yesterday and that has stopped all the detonation, power is down but I will work with it. For now I will play with the carb for a bit to try to get max from it and then I will start juggling head gaskets/spacers to try to bring back some of the lost power.

[Shaka]

Where does that put the squish?  Either way hooray for no detonation!

[sidthesloth]

That would give a squish of about 1.7, too much but I will work on reducing it in the next few days. Power drop sux so there is my incentive.

[Shaka]

Well at least you aren't damaging anything in the mean time through detonation!   I'm going to start work on my spacer this evening.  Wish me luck!  I'm nervous about matching the case tomorrow!  Trying to think of the best way to prevent any metal shavings from dropping inside!

[zombie]

I have seen quite a few posts where people are using a garden hose to flush out the cases! I'm not tooooo keen on it but the option is always there. Good luck Bro! Congrats sid! welcome to the down hill slide!

[sidthesloth]

For me, I would be stuffing the case full of rags and when you are finished give it a good going over with the vacuum cleaner then blow with compressed air. Patience more than luck, all the best.

[zombie]

For me, I would be stuffing the case full of rags and when you are finished give it a good going over with the vacuum cleaner then blow with compressed air. Patience more than luck, all the best.     Sounds good to me!

[Shaka]

I've heard of the "water flush".  Doesn't sound like that great of an idea, more of a last resort!  I'm thinking I will tape some plastic to the inside to seal it all off, then stuff with oily rags on top of that. 

[zombie]

There you go!

[sidthesloth]

Last night I pulled the head off again to put in another spacer and saw the piston was a touch over the bottom of the ports so I played with some gaskets and now have the piston a shade below the port and deck height just slightly in the negative but only a bees dick. I now have the head on with only one gasket so that should be a squish of about 1.2mm, roughly. I know I should be taking measurements. No detonation last night but still with carb tune probs. with the air cleaner clogging up it seems to be with oil not dirt. After reading Gordon jenning's book I see how the fuel does blow back along the inlet tract, with my filter getting clogged with oil would that mean I need to lengthen the air filter tube or maybe reduce the oil mix, I am currently running 300ml. to 10litres of fuel, I believe that gives a ratio of about 32:1. I have bought a new filter for it today, wanted a spare before I wash it with kerosens or petrol just incase it damaged it. Looking up from here.

[Shaka]

It sounds like you are set-up about right.  The piston just below the ports and a 1.2mm squish.  That blow back seems to be pretty normal on these scoots.  If you are having troubles with the filter getting clogged you could try moving the filter further away.  Also check to make sure that your carb is lined up properly with your intake manifold.  Might also want to check the reeds as well.  I've never had any trouble with my filter ever getting clogged up with oil.  32:1 sounds like a little too much oil also.  You might try lowering it down to between 38:1 & 40:1.

[sidthesloth]

Cheers Shaka, that squish measure is a guess on what I have used but I think it is pretty close. I will reduce oil in my next mix, I started with that ratio for a safe barrier when starting out, (better too much than not enough). the carb goes into a round rubber sleeve so it can't really be out of alignment.
I am running the needle at the second from lowest setting, want to try to get it to the middle setting if possible, but strangely enough it does affect the throttle at around 1/2~3/4 open.

[Shaka]

I don't know really what to tell you on the excessive blow-back.  It almost leads me to believe there may be something up with your reeds.  Better get Zombie's opinion on this as well.  The needle height has it's effect from 1/2-3/4 throttle!