So what is the most anyone has removed from the head? I just dropped mine off, and I told the guy .020. He won't do the job till in the morning, if I can go more I'll call him first thing.

 

I went .15 got to watch you don't run out of valve adjustment remember 10lbs head bolts X pattern
.006 exhaust .002 intake clearance .006 feeler gage I had {Mopar air gap on old elect. ignition}
.002 was a bear {piece paper mics out to .004 so mines a tight paper LOL}
but it runs and sounds great. Ran it for about an hour then retorqued & readjusted everything.
Just got spacers back for rear wheels 4" i'll try them out tomarrow

 

P-S
.015 brings comp into 9to1 range no pinging or octang problems any higher?????????

 

<div class="FTQUOTE"><begin quote>Originally posted by: greasemonkey2660

I went .15 got to watch you don't run out of valve adjustment remember 10lbs head bolts X pattern

.006 exhaust .002 intake clearance .006 feeler gage I had {Mopar air gap on old elect. ignition}

.002 was a bear {piece paper mics out to .004 so mines a tight paper LOL}

but it runs and sounds great. Ran it for about an hour then retorqued & readjusted everything.

Just got spacers back for rear wheels 4" i'll try them out tomarrow</end quote></div>

Thanks for that. I'm gonna stick with .020 and see what happens. Can't I grind my push rods if I run out of adjustment? I haven't checked to see if they pull out - but I think they should.

To pull the head I sat the machine up on it's rear, with the head pointing up in the air. It was very easy to pull.

I have a new head gasket, but do I need it? Thanks for the torque specs and valve adjustments.

I hope to have it back together tomorrow evening, but I might be too busy.

 

WOULDN'T TAKE THE CHANCE ON REUSING HEAD GASK. IF I REMEMBER RIGHT GASK. WAS ONLY ABOUT 6 BUCKS.
AS FOR GRINDING PUSH-RODS MAKE SURE YOU GET CORRECT ANGLE AND POLLISH DONT WANT TO WEAR THROUGH ROCKER ALSO CLEARANCES MAY CHANGE REAL FAST AS PUSH-RODS SEAT IN
LET ME KNOW HOW.020 WORKS .YOU MAYHAVE ENOUGH ADJ. AT PUSH-RODS GOOD LUCK

 

The gasket is cheap, I'll use the new one. I just looked at the rocker arms. I should have plenty of room for adjustment. I don't think I'll need to grind the rods. I'll keep you posted. Can compression ratio be measured from the actual compression?

 

Not exactly, actual compression will rise with mill, but the ratio is the stroke verses combustion chamber size {mill head ,smaller chamber,higher ratio} I knew the formula once but its been a loooong-------time ago. Mach.shop should be able to help

 

I got the head back on today. With .020 taken off the head I had plenty of adjustment on the valves. I wish I had taken off .035. I think there is plenty of room.

Anyway, there is an improvement, but it's slight. The shop charged me $32.00, the gaskets were about $18.00 delivered, and the job was easy. I had good access by setting the machine up on it's rear. I can't detect any detonation with 87 octane. I'm glad it's out of my system. I'm not modding anything else on this bike.

The Suzuki LT - Z50 is for the most part an unresponsive chunk of junk - but my kids love it.

In retrospect I would swap the rear sprocket to a 48 tooth with a 420 roller chain and walk away happy. It has come a long way - but I really thought I'd get more out of this thing. My kids are happy, and I guess that's what really matters.

Modifications:

C.T. pipe
K&N filter
new jets
milled head .020 - wish I had cut more off
48 tooth sprocket - the most important

 

was reading your list of mods--what size jets,w/arrester mods& extra holes in air box I'm running 80 main 17.5 pilot----what CDI ? any work in clutch area? I've got some sprockets but now playing with clutch ,spacer removed 3rollers out lightened shoes {trying to raise RPM where clutch ingages}
stock CDI=5,000 RPM range----90CDI=8,400 RPM {using,120$ @ dealer} Dyna's got one that supposed to do 14,000 but I know what 8,400 sounds like do'nt think I want to try that yet I'm not
in mood for rebuild

 

I never did change the CDI. We have some steep hills and my kids are too fearless. I like the CDI speed limiter - at least for now. Also we let a few of their friends ride it, and they really don't need speed. They need gully crossing power. When they need more speed I'll get them a 90cc machine.

I tried pulling three rollers, but wide open it would only go about walking speed. It made me realize that I needed to concentrate on getting more out of the motor. I put the rollers back in right away.

I'm not certain but I think the main jet is about a #75. I forget the pilot size. It's whatever came with the C.T. pipe. Whatever they are it's running rich. The cylinder head and plug had too much carbon. I'm going one more size down on the main jet.