Coleman BT200X | Better Performance on my Mini Bike - Tachometer, & Richer Jets! | Wet Coast Fab

In this video, I take you through my journey of improving the performance of my Coleman BT200X mini bike. I've been working on getting a torque converter to work with the 196 CC HiSun engine and experimenting with the carburetor and governor linkages.
To start, I installed a simple tachometer to measure the engine's RPMs and an hour meter for maintenance. Next, I replaced the carburetor jet with a larger one to increase power and RPMs. Finally, I tweaked the governor to allow for more rearward tension and higher RPMs, resulting in a much faster mini bike!
Join me as I install these upgrades and test the results on my Coleman BT200X! Remember, these modifications may void your warranty, so proceed at your own risk.
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My last 3 videos:
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Link to jet kit
Runleader Digital Maintenance Tach/Hour Meter
amzn.to/40F3QBX
VEVOR 212CC Torque Converter Kit
amzn.to/3nczKqo
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0:00 - Introduction
1:00 - Adding a tachometer
3:07 - The tach works!
4:12 - Taking out the old carburetor jet
4:53 - Surprise! Tamper-proof jet!
5:05 - Jet talk
5:38 - Removing the old jet
6:01 - More jet talk
6:39 - New jet kit
7:17 - Installing the new jet and re-assemble
8:05 - Yay! More RPMs! Is it enough?
8:51 - The governor arm that wants to close the throttle
9:14 - Figuring out the throttle linkage and springs
10:12 - Moving one spring to change the top RPM limit
10:28 - Testing it out!
10:33 - 4600 RPM!
10:35 - Success!
11:33 - Test ride!

[@robinbrowne5419]

Awesome 👍 When I was a kid back in the 70s we all had mini-bikes. Most of them had 3.5HP Tecumseh engines. We used a paperclip to bypass the throttle spring and get about an extra 5 mph. We never knew about the jetting though (Probably a good thing.) Cheers from Canada :-)

[@wetcoastfab]

Love it, Robin! That's so cool! I was too poor to have a mini bike as a kid but now I can afford one, I'm going to town! Returning your cheers, also from Canada! 🍁🇨🇦

[@marklaramie7393]

Minis are cool to mess with, im 67 yrs old, ride motorcycles n minis, good job n tips on your work

[@wetcoastfab]

Love it, Mark! Thanks for the complements! Some good videos coming soon!

[@marklaramie7393]

Canada here also, ontario

[@wetcoastfab]

@@marklaramie7393 Love it! I bet you have more opportunities for snow riding than I do on Vancouver Island 🇨🇦

[@stevenkinnison8044]

I used an easy out to remove the jet from my stock Coleman carb. Also if you remove the spring on your throttle cable where it connects to the linkage it will get you more rpm and I always zip tie the governor spring and remove the throttle stop screw.

[@darealist1781]

Love these videos . Keep upgrading

[@wetcoastfab]

Thank you for the kind words! They really keep me motivated to making these videos

[@kleingarrett55]

crazy how different these bikes are my BT200x tops out at 30mph and all i did was cut off the throttle screw. I'll have to get the tac you mentioned to see what RPMs it is doing.

[@wetcoastfab]

Right? 20mph out of the box was the best I could get. I'm planning a small dyno build so I can do real-world testing on these engine mods that isn't just by seat-of-the-pants feel. Thanks for the comment!

[@KB_Joys]

I've heard of ppl messing with the springs and weights in the TC to get it to engage at lower RPM

[@wetcoastfab]

I used to do that with a street scooter I had. May try the same thing with this TC, thanks!

[@stevenkinnison8044]

I had the exact same bike with the exact same setup with the factory throttle return spring removed and the throttle stop screw removed with the governor spring zip tied and got 50mph out of mine.

[@wetcoastfab]

Love it, Steven! Thanks for the tips!

[@joblai3714]

Tie the black spring so it doesn’t stretch

[@Deucealive75]

There's still something wrong. I have watched dozens of these Coleman torque converter videos and never seen anyone get less than 34 MPH with a Coleman 200 and a torque converter. I have also experienced this. While I was waiting for parts for my engine build I put a 100% completely stock 196 governed to 3600 RPM on my Coleman with a torque converter and ran at least 35 MPH. It was a dog after the belt shift and took too long to get to top speed as expected. A bit more engine and much better gearing takes care of that.

[@wetcoastfab]

Thanks for that! I'm feeling the same way. I've got a 1983 Honda XL250 that was 22hp from the factory, and is only 52cc larger. There has to be something up with this engine, I'm thinking

[@ChrisBusy]

Nicely presented film my friend however you might consider buying a metal jock strap if you're going high rpms with thr atock rod and f wheel😢

[@wetcoastfab]

LOL! Right? Not to mention the metal instrument panel I made! I'm going to design and 3d print a new panel, as well as get a billet flywheel before getting too crazy with the RPMs

[@chadsensabaugh768]

You can drop to smaller rear sprocket. You'll loose a little torque but gain top end. I think factory on those coleman 's os 50 tooth, drop to a 48.

[@wetcoastfab]

Thanks for that info, Chad!

[@Deucealive75]

A 2 tooth change is nothing and will not make much of a difference. In fact that change may slow the bike down a touch. With stock engines and a torque converter the Coleman 200's need a 60 tooth sprocket.

[@GluteusMax777]

Put a 37T on my CT200U EX, along with a couple other mods. I'm getting a max speed of 43mph @ 5200rpm. I don't keep it at that rpm for more than a couple seconds. Mostly cruise at 36mph@ 4700rpm.

[@ronp5778]

Ziptie the governor for higher rpms, get an intake an air filter. Welcome to 49 mph.

[@wetcoastfab]

Even with the governor disconnected, 41MPH seems to be my limit so far. I'm going to mess with the exhaust next, I think Ron

[@kelvinvega2995]

I have a problem with my mini bike bt200x. When the motorboat runs, gasoline leaks out of the gas tank cap. I already changed the cover but it is still the same, what will it be?

[@wetcoastfab]

I have a similar problem with the same engine on my air compressor - it vibrates so much that the gasoline just gets splashed up against the gas cap and weeps out from under the cap. I think doubling up on the rubber gasket under the gas cap might help.

[@dmmartinez62]

movie the spring to the first hole

[@Deucealive75]

Yes. There are three holes close together on the governor arm. There is also a hole in line with those three but out further on the governor arm. That outside hole is the one to use. But he will still not get to higher RPM because the bike will top out before it ever gets anywhere near max governed RPM. Here his bike topped out at a lower RPM than stock governed RPM.

[@SlavikIvanchenko]

Ты его купил и что еще ?

[@NONAME-kw3pu]

6.5 HP @ 3600 RPMs... at 5000 RPMs ~9HP???

[@wetcoastfab]

:-D so if I get her to 10,000 RPM I'm pushing 20hp!!!! ;-)