MOPED ARMY

Really lean.

Also, to get a proper plug read you need to look down inside of the plug to the base of the insulator. There should be a tiny 2-3mm ring of colour. The nose colour can be misleading.

https://www.mopedarmy.com/wiki/Plug_chop

https://www.mopedarmy.com/wiki/File:Basic_Plug_Reading.gif

Good resources. :)

I’m running the one that came with the dellorto but I removed two of the three screens as somebody recommended. Would that make such a big difference? Was it a mistake?

I am not running a larger jet than 76 and I have a 16:16 on a 70cc kit. Actually two bikes have this set up and are not jetted that high. Take advise from dillon and chase down your other air leaks. And i would always start tuning the sha with all the screens in. Get it to where you have it just a touch too rich and then remove one screen at a time until you get the nice air/fuel mix needed.

Just make tuning fun, then you wont loath the process. I havent found how to make it fun yet, but that is what I'm trying to do. Ha!

Thanks guys - I found I have an air leak where the carburetor bowl tightens onto the carb - which is weird because the rubber gasket is there and it's a brand new carb....... frustrating!

You mean the float bowl? Is it a clone carb? They often have air leaking issues from what I've read. Usually it's the top cap or the clamping area.

Not to mention it would leak gas everywhere.

Which side of the carb are you spraying? Towards the front where it sucks in air?

Also, not every sha has or needs an o ring

I was spraying all the different areas one at a time, very targeted, to see where RPM's drop. I'll try to make a video later. Thanks!

Well I have never used a magnifying glass .. that’s a good idea.. but I think if I was on the track running a 125 or. 250 at red line for an hour or so ... I see that to get it just right for the temp .. sea level up the mountains etc ..

Or blow the motor .. and blow 3000 g ..

But after tunning 100s of 2 strokes from 76 to now .. I just never had to get that eye ball tuned in ..

my rule of thumb is simply this

If your plug Is a dark tan on a full speed under load plug chop .. assume its a mid tan .. if it’s light tan it’s going gray .

Lean always your a little lean ..

this way if that full speed plug chop you did over a mile run ..

Won’t drop you in shit .. when some guy comes up your side on the hwy on his custom hobbit or Honda 3 speed with leg shields or that fantic super 6 speed

And gives you the old wank sign and speeds away .. making you look like a right wanker ..

You got to have the confidence that when you hold that baby out .. head on the speedo feet up over the rear turn signals .

Slipping in to his slip stream picking up RPMs closing in for the sling shot over take ..

And it’s 2 miles of flat out .. it will lean off a little ..and as you come up side for the over take .. its locks up .. and you look like a NOB ..it’s not that complicated..

Jet so if your flat out a mile .. and you roll back the throttle just 1/16 it picks up just 1 or 2 mph your just right always be just a little fat on the main .. it don’t hurt running around 40 / mph half throttle to be just a tad fat ..

Sorry if I dragged that out to

I end up rich most times. But I live near hills and you can seize a lean running bike easy down a big hill. I actually soft seized my polini down a smallish hill today. The slide in my sha runs the mid range a little lean I think so it got me. I need to grab a temp gauge for this bike I think. Thankfully it cooled enough and started back up by the time I got to the bottom of the hill. So far my experiences with garelli polini kits have been the same this way. Little soft seize down a hill, ripp it on home.

I did come across this fun chart for plugs.

If you're tuning by color spend the money and get a colortune plug, way more accurate

http://www.gunson.co.uk/tech-torque/Colortune-See-inside-the-combustion-chamber

You've never seen the colortune plugs? When i had my dirt bike color tune showed I was several jets off, plug showed I was dialed in. Dyno was spot on with color tune. Fun toy if nothing else

Seems like another learning curve to over come. But a neat toy.

That plug chart of Jay's is not the color of an insulator after two miles of riding..is it??? ..what about the color on the original post ...some is developing under the electrode....post a brand new plug next to any plug chop so it's possible to evaluate if it's white or even whiter ...

Here's an idea: keep jetting up until it's gurgling. Go higher and it will four stroke to death. This is the cheetachrome method...if u keep changing things and nothing happens ...other problemo...

Everybody says you gotta cut the threads off the plug to get at the base ..true..but really how many do that...it's quite a pain

If you rode for two weeks and your plug was that white ...that's real bad. A two mile chop is a pretty subtle thing. Also where the part of plug most exposed to the exhaust port is at least on a Vespa is a bit different than elsewhere, ie leaner . But perhaps I'm wrong on all of this. What u say Dillon?