DROWsports Grand Axis Two Stroke Powered Ruckus

By Mike Kojima

The Honda Ruckus is a small 50cc scooter that has for some reason become the darling of the modified car crowd.  You would never think that car people would have become enamored of a 100 mpg, 35mph small scooter but nevertheless the Ruckus is huge.  MotoIQ has a project 50cc Ruckus that is probably the fastest stock engined Ruckus built so far.  You can read about that here.

Of course in our circle, if some is good, too much is always better.  Andrew Horn, owner of DROWsports in Signal Hill is part of the MotoIQ crew and has helped us with many of our small powersports projects.  We helped him with the construction in his quest to build the ultimate Ruckus, check it out!

The engine for the Ruckus came from a Yamaha Grand Axis, which is a 100cc two stroke scooter.  Two strokes have a lot of power potential and the Grand Axis engine has a lot of support.  The cylinder and piston were changed out in favor of a Malossi big bore kit which brings the displacement up to 123cc.  The cylinder was ported by DROWsports and the cylinder and piston were WPC Treated.  The cylinder was then coated with Embee heat rejection coating.
The engine case was fully polished while everything was disassembled.
The bearing oil passages were modified by DROWsports to feed more oil to the main bearings.
A DROWsports stroker crank increases the displacement to 130cc.  The orange plastic things on the counterweights are stuffers which improve the primary compression.  This helps a two stroke scavenge more effectively.
The transfer ports in the case were matched to the Malossi cylinder.



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Scott Helmer
Scott Helmerlink
Thursday, December 13, 2012 10:51 PM
VERY nice Ruckus! I need to get a Ruck myself.

Possibly a tad pedantic of me, but... "intakeless filter"? :P
Friday, December 14, 2012 6:10 AM
That's not project Ruckus! Are any of the smaller projects going to get an update anytime soon?
Friday, December 14, 2012 6:20 AM
It's all good Scott :)I think we were aiming for filterless intake but it's sorted now.
Der Bruce
Der Brucelink
Friday, December 14, 2012 6:21 PM
I keep waiting for someone to make a 225 Fatty tire kit for both the Rear AND Front before I plop down the cash (I keep my eye out for a steal). I'm thinking Ruckus meets Batpod! I'd love to see some vids on this thing flying down the road ;-)
Friday, December 14, 2012 7:28 PM
I want to see this thing run the quarter mile!
Friday, December 14, 2012 10:41 PM
That taillight looks suspiciously similar to an 03-05 Yamaha R6 item.
Monday, December 17, 2012 5:45 AM
Great job Mike. Good to know you are still tuning the heck out of this small two strokers.
But I wonder if you can beat these guys..
Monday, December 31, 2012 7:35 PM
Im a diehard two stroke fan, and this thing needs a banshee/rz350 motor. 2 cylinder 350cc with a 6 speed and no reverse. Brinnnnngggg brriinngg!
Thursday, January 07, 2016 1:44 PM
So, I know this is a super old article, but what is the cost for something like this? A few grand? Honda Grom priced? I currently ride a Yamaha FZ-09, but I wouldn't mind a commuter bike.
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