New Here - First Build

[HDBobbers]

Introducing... myself!

Connecticut here, east side. I just got msyelf into mini bike building having been a spectator at some local events that one of the local MCs hosts (MINI BIKE THROWDOWN!). Got tired of being on the sideline cheering... and laughing, so figured i'd build one of my own.

I'm at the tail end of my first build, getting ready for a race on the 27th. Found a busted up Motovox MBX10 bike on Craigslist for 30 bucks. Sick find, because i was mainly interested in just the frame and small components. Brought it home and tore off the old POS motor that seemed to have seized, then re-welded some of the busted welds.

Bike was seriously abused.

Had a nice coupon from Harbor Freight for a Predator 212, so picked up one up for about 100 bucks. I figure, 6.5hp 212 ccs should be plenty to let me tear around with.

Sent away for a Max Torque 12 tooth and a #35 chain.

Found that the stock air filter is was out of the question, so got myself a little cone filter and neck from OMB and terminated the remaining breather pipes with inline fuel filters.

Just have to mount up the chain and i'll be rooooollin.

I've been a lurker on this site for a while, getting ideas. Figured it was time to register.

 

[itsid]

Welcome,
that looks like being fun to ride.

I like it

'sid

 

[landuse]

That is a really cool little bike you have there. What is the gearing

 

[HDBobbers]

Right now it's still got the 75T stock rear sprocket and the front is 12T, though i'd really love to improve the rear.

 

[HDBobbers]

I'm actually looking for any suggestions to get more speed and power out of this little motor.

Truthfully... i'm more used to working on my Harley than these little motors, so i'm having some difficulty figuring out where to go next.

 

[danssoslow]

BMI, American Powersports, Gokartsupply, and many others may have sprockets that will work for you. If the sprocket is bolted onto a hub, check the bolt pattern and do some surfin'.

I'd almost guarantee googling the tooth count, pitch, and bolt pattern you need will net you something. If you can't find your target tooth count, then google the pitch and bolt pattern.

Also, the predator engines are so popular right now, googling "predator hop ups" should bring up a plethora of companies selling kits from mild to wild. At that point, it's just a matter of picking your flavor and paying the price. Be aware that there is a new Hemi-head predator out now (#60363) that takes some different parts, so be aware of which engine you have so that you purchase the right parts.


Btw, I love the shape of that bike. It reminds me of Jesse Rooke's X-1 motorcycle.

 

[OzFab]

Sweet ride

You could start by matching the exhaust with the intake, hi flow that is; it can breathe in but it's having trouble breathing out; once you do that, it may require a slightly larger jet...

Then there's the governor...

 

[HDBobbers]

Thank you for the info. I'll check it out some.

I read the sticky on the governor pros and cons of disabling and surfed through a bit on others experience with removal. Leaning in the direction of full removal, though this project has been on the cheap so far and removal would be coupled with purchase of I believe more durable components. Correct? Rod and flywheel? Or can I get away with just the governor removal?

 

[danssoslow]

Rod and flywheel could never hurt. Sturdier parts, quicker revs with a billet flywheel. Essentials that can pay for themselves immediately if you seek to pour on the power later on.

 

[landuse]

Thank you for the info. I'll check it out some.

I read the sticky on the governor pros and cons of disabling and surfed through a bit on others experience with removal. Leaning in the direction of full removal, though this project has been on the cheap so far and removal would be coupled with purchase of I believe more durable components. Correct? Rod and flywheel? Or can I get away with just the governor removal?

As long as you don't change the valve springs for stronger ones, you won't need any stronger parts after removing the governor. The valves will start to float before anything gets too serious for your engine

 

[OzFab]

It's also possible to simply adjust the governor for a few more RPM, reulting in a few more MPH...