Minimum safe head to piston clearance.

[fireblade]

Dude, don't get me started! lol
I was being kinda sarcastic with that remark, although the member of parliment who spearheaded the campaign to make nitrous oxide more difficult to obtain was actually in his own mind trying to do the right thing. We had a sorts of problems with stores selling "Legal highs", and big balloons of nitrous for people to huff. He thought he was doing the right thing. We just had an election, and he got the boot lol.
I've just got my fingers crossed that my renewed Drag license arrives in time for me to get my bottle filled before the next meet. (not for my scoot though )

[timcat]

man that s*** can and will kill ya smoke weed that may not be legal but it wont put you in a coma

[Kenny_McCormic]

Dude, don't get me started! lol
I was being kinda sarcastic with that remark, although the member of parliment who spearheaded the campaign to make nitrous oxide more difficult to obtain was actually in his own mind trying to do the right thing. We had a sorts of problems with stores selling "Legal highs", and big balloons of nitrous for people to huff. He thought he was doing the right thing. We just had an election, and he got the boot lol.
I've just got my fingers crossed that my renewed Drag license arrives in time for me to get my bottle filled before the next meet. (not for my scoot though )

Here in the states automotive grade nitrous has sulfur in it so people wont huff it.

[circusracer]

Having finally hauled my scoot out of the shed for summer, I though I'd make some long awaited mods. I rang the local Honda agents, and to my suprise things like head gaskests aren't too costly.
I've also been planning a pulley mod for ages, (I have a lathe) and I was rereading the tech doc for the 1000th time. I see it refers to the aluminuim pulley, as being from the 84/85 model. I have one of these engines for spares. SO, If I use the head off that engine, AND skim some off it too, what the minimum safe squish clearance?

I have three running Sprees that I have been playing with. One is an '86 with the domed piston, I bought an '85 head off of eBay and milled it down .020". This scooter starts perfect every time, one kick, and runs great . Another one is an '84, I broke the crankshaft with an impact on the front pulley nut so I bought an '87 off of eBay and installed a .020" milled down head as well, still no issues. I had both out today (52 here in MI) and they ran just fine. My other Spree is an '85 and I already have the shaved head and domed waiting to go in. So cut your head, and pop up that piston, and be amazed at the acceleration your little scoot picks up.

[fireblade]

Thanks you circus. I'm actually about to bust a move and begin to reassemble it. I'm a little bit worried about the amount of movement in the little end. the piston has a bit of slop in the bore too. A bit of little end slop plus a whisker of rod strectch might = a piston vs head incedent.
I priced up a new piston and rings today. Ouch! fark they're not cheap.

[circusracer]

I got a new piston for just under $30. I didnt think that was too bad for brand new (and going from dished to domed )