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Old 05-21-2007, 03:38 PM   #16
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so differences between the 21MKII and 21T are
different sleeve
not conical shaped piston
crank isn't filled
here are the pics
left is the updated 21


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Old 05-21-2007, 04:40 PM   #17
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how about the bearings
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Old 05-22-2007, 03:02 AM   #18
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they are same
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Old 05-25-2007, 02:56 PM   #19
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Hmmm. Not sure what to think about this one now. Looks like it would surely cost less to produce...
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Old 05-25-2007, 03:18 PM   #20
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Me too on the cost thing. As long as it goes just as hard and the crank is stronger than the old ones!
I assume the 21's dont like heat as opposed to the 28's with a thicker crank?
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Old 05-25-2007, 10:14 PM   #21
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Ok guys time to answer your questions about this mill

Rick brake has offered the green machine with is own mods. He emailed STS quite a few times with pics and specs on how to make the engine BETTER.

So, STS took in the design, and here you have the MKII.

Rick Brake = RB Mods.

Quote:
Review from Rick Brake of RBmods.net :

History and the making of a new STS MK11 engine. When testing the D21B and D21T engines my preliminary diagnosis led me to study these engines in depth and have my drivers testing them.

Everything I thought the engine would do was correct, These were great engines for the price but I thought STS could do a little better with the same amount of
effort. So after a few emails and sending them pictures on what to do
if I were them they came out with a engine after my own spec's. They actually
produced a great engine that would give these 400.00 and 500.00 dollar
engines a run for their money. This was dubbed STS MK11. My drivers have
been testing it and found that it was able to keep up and even surpass
these high dollar Italian engine with the grace of a expensive .21 5 to 8 port
engines and get about 9 minutes of run time doing it.

As I watched the testing this engine had taken a buggy and was pulling wheelies up to 75ft down the straights with a crisp sound that I and you and everyone else
likes to hear at 202 degree temps. I had thought that it was time STS release
these to the market to compete against the ever soaring over priced
Italian engines.

Finally! You to can have this engine and feel the bliss of knowing you got way
more then you paid for and probably for the first time. These engines are
worth every penny. Modified they are off the hook, Smooth, powerful, reliable.
Rick Brake RBMods
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Old 05-30-2007, 02:17 AM   #22
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is it possible to just buy a piston for it somewhere, and not the whole set?
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Old 05-30-2007, 10:49 AM   #23
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i can only get you the piston/sleeve. no one sells either separate.
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Old 05-30-2007, 01:11 PM   #24
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not even from the factory itself?
might ask them
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Old 05-30-2007, 02:46 PM   #25
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you aren't going to find a company or engine manufacturer that sells their pistons separate from their sleeves. It'd be pointless to do so.
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Old 06-27-2007, 11:42 PM   #26
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KemoRC,

Do you know which engine would be better on the STS line for TRUGGIES ?

thanks,
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Old 06-28-2007, 09:04 PM   #27
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that depends on your budget AND what your track allows for engines. if you want to go the .21 route, the MKII is the way to run with. If you want to save a little dough and go with a .28 or even a .30, those could very well be up your alley too.

The .28 in a truggy is powerful enough as it is, but i've seen a few .30's floating in a truggy. Jammin jay drove one around, the power band was similar to a light switch... on and off. Truth be told, i think that .30 in that particular video was modded.
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Old 07-06-2007, 03:05 AM   #28
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I've popped a few STS cranks, my 21T had the rear bearing fail and that snapped the crank. STS repaired the engine and sent it back, their service is top notch.

I'll be eager to see how the MK II goes...
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