How to install a big bore kit qmb139

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After purchasing your big bore kit for us, use this video to help with the install of your qmb139 90cc big bore kit. This engine rebuild how to video will work on all qmb139 engines. This includes the Kymco agility, all taotao 49cc scooters, rocketa, Puma, Lance, and all other 4 stroke 49cc chinese scooters. Please visit our web site to purchase our 80cc or 90cc big bore kit. We only sell quality kits that we use. we have used ebay big bore kits and they just don't last.

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[Spitfireseven]

This was the most beautiful front end rebuild imaginable. When you started it up at the end that was the finishing touch that made it seem so simple. Of course this is not simple but you did a fabulous job of making it about as simple as it could get. I do not know of a video on any other type of motor, chainsaw, small engine or otherwise where the entire operation of rebuild was done in one video to completion. All the cuiting and editing was just great. Thanks for a great video,

[DomVito]

I did that with my gy6 . Went from 50cc to a 80cc . Huge difference. Cvt tuning, jetting, exhaust made a huge difference. Can reach speeds up to 50. Which is nice for my backroads that require 40mph

[joseelbarbero]

Glad someone of your caliber is showing more chinese scooters.

[CB-]

Thanks just got 80 cylinder installed no issues

[SegaDisneyUniverse]

After watching this tutorial I feel a lot more confident that I could do this myself. But my clumsy behind would probably end up breaking something anyway lol!

[rlgaming]

Thanks. Found it very usefull and it helped me to do my scooter faster and properly in 2 hours. Many thanks for this video.

[alexnather]

Im using this video to help repair my 150 i ran it without an air filter and a small rock entered the air intake and destroyed the top end... I have done a BBK kit on a 50 before and im confident i can fix my 150. Now i know to ALWAYS use an air filter 😎😎😎🤙

[garyfisher]

You omitted changing the main jet or lifting the needle inside the throttle slide to allow more fuel through, also you should have oiled the cam and housing, other than that v.good tutorial.

[maggie]

This video was so helpful and if I had the tools I would do my own scooter with the 80cc Big Bore Kit... Thank you so much..

[blackgumbo]

Thank you for illustration a good how to video. I installed my big bore kit one shot no hiccups. Thank you. Please explain about installing a tachometer and correct reading for a big bore kit. Thanks again.

[chadman]

A secret I figured out pull the chain mark the very center of chain with sharpie then mark cam with sharpie perfect timing every time

[nategardner]

Talk about taxing on the price, HOLY SHIT!! $300 for 120cc jesus christ this is why i LOVE EBAY

[GY-SCOOTERS]

Great tutorial video matt ...🙂👍I'm currently working on my 50cc thinking about upgrading her to a 80cc

[karirautio]

You have the special tool for valve adjustment. Feeler gauge is not needed. There is the scale, 1 turn divided by 12. The pitch of the screw is 0, 5 mm. You turn the screw first to 0 clearance and then open as mush needed. 1/12 x 0, 5 mm = 0, 042 mm, 2/12 x 0, 5 mm=0, 083mm and 2, 5/12x0, 5mm=0, 1mm. If you watch YouTube Nicks Garage, he never use feeler gauge when adjusting valves in V8 motors. He opens the adjusting screw from 0 clearance half turn. Very easy method.

[trumpsarmy]

I'm ordering this kit with the new cam my kymco 50 agility I'm excited to do this I never done one before so learning on the fly lol

[rakamlih]

Nice and good work Super job 50 cc beter economische now en relaxing

[KhrissZaitsev]

Does the weight or mass of the new piston remain the same as the one from lower CC? I wonder about that since I would believe any changes in that would require a new Counterweight as well. Or, how does that work? maybe a new video addresing that for those who are curious about it?

[jeffmee]

A 21mm PWK carb works good on this setup nice video I put a wood block under the back wheel can make it easy to get the head off and make sure the arrow is pointing down on the piston.

[davespooney]

The 2 nuts to remove the head stud is the smartest thing I’ve seen this week.

[dapv]

You should have a follow through on the engine break in after bbk.