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From the fine folks at Vertex, Ive worn that Blue shirt before

See a Harbor freight near you. they have some get r done good enough calipers for I think under $7 or $8 bucks, then they always have tons of %20 off coupons available with a choice of some free swag.
www.harborfreight.com/#
I keep a pair in the bottom of the mobile tool box.



I haven't had my Scoot on any drag strip, in the 1/4 would take a week and a day to get down there and tracks usually have a maximum et track time to get it done.
The Twist and Go is about as easy as it get to launch. Just whack the loud handle and go.
Mines just a nice reliable stock internal grocery getter, country road cruiser with a tuned up 60ft time.

I have other toys for the 1/4,

These fine folks list both.
Ive dealt direct with them and they have provided me stellar customer service in the past.
They actually have people that answer the phone....
www.partsforscooters.com/search-results?search=QMB139+cylinder+studs

In general .008-.009 Minimum....
Don't be at all concerned if you have you have a couple more as your minimum...

Thanks, a 150 stock internally, 4 year 7 month old, 152 hours, debagged no stickers daily grocery getter in season weather, run around the local country roads of Randleman NC.
I have a bunch of bikes, she's just my toy with cargo space thats cheap to operate and fix.
The Nitrous is a cheapie dry shot, in simple terms it just accelerates the burn and that alone will give you a little hp and torque boost.
The system comes with one numbers jet and includes a drill to enlarge the jet I have to check my notes how much, we don't to hit the Loud button at low rpm's, so its a full throttle deal, 5-6 second shot is more than sufficient to do what you need to do.
Hitting the loud button you will see a instant jump in rpm's on the tach, so its nothing amazing but if I'm at a whopping 8.2hp stock hp we see a 1-2hp gain ands maybe a 1ftlb of torque or so with the cheapie system.
With the stock gearing and same peak rpm no faster mph just faster to get there and she Pulls up hills.

She wants more and I have contacted the manufacture to get a larger jet ,before I do I need instal a fire extinguisher cuz Ill push it till she intake backfires and blows the intake off and that will most likely knock the fuel line off and were on fire. when I get back home I have a custom hose maker in town and make the Nos and fuel line to braided stainless.. 
Some say Why? cuz the GY is so inexpensive and easy fix if she grenades, very cheap fun..

Here is my OE manifold and you can see the Blue caps were vacuum robbing hoses were connected and the one on the carb..
Then here is Manifold #2 were I plumbed a fitting for the dry shot of Nitrous line is as you see.