2013 Maxter, the straight up approach

Keith Bridgeman

Seems like the new approach is to get the cylinder as straight up and down as possible on the new ICC engines and they also seem more compact.

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Jim McMahon · Posted: Thu Nov 29, 2012 11:30 pm Post subject:

Yeah looks like design is coming back to that setup, look at the angle on the inlet though. Street sweeper baby!
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Tim Salvino · Joined: 20 Nov 2010 Posts: 261

So, i guess those angled motor mounts were useless... Rolling Eyes

Jim McMahon · Posted: Fri Nov 30, 2012 7:05 am Post subject:

I think part of it is cost streamlining too. Bringing the KF and KZ motors closer together.
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Paul Makarucha · Posted: Fri Nov 30, 2012 8:57 am Post subject:

As I understand it, it is all being done for intake volume and velocity.
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Keith Bridgeman · Posted: Fri Nov 30, 2012 9:47 am Post subject:

Nice to see an engine being updated Laughing

just kidding. I want one. But after its built by someone, they would try to sell it to me for $9000.
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Charles Kaneb · Posted: Fri Nov 30, 2012 12:38 pm Post subject:

The reed cages are still too small... look at a KTM or Honda GP125 engine and note that they put a far bigger cage in a tighter space.

The pipe draws on the crankcase when the engine's in the powerband, and the less restriction to inward flow the reeds give during this time the more air it'll move.
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Bernard Muminovic · Joined: 24 Jul 2009 Posts: 623

Keith...I almost had an orgasm when I saw this pic Twisted Evil

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Jim McMahon · Posted: Fri Nov 30, 2012 1:05 pm Post subject:

Keith Bridgeman · Posted: Fri Nov 30, 2012 2:47 pm Post subject:

Bernard Muminovic · Joined: 24 Jul 2009 Posts: 623

Bernard Muminovic · Joined: 24 Jul 2009 Posts: 623

The main changes to the new engine are:

the cylinder has been made more upright

the angle of the reed block has been increased and moved closer to the cylinder

The result of these changes is the power hits faster and harder after shifting gear.
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Jim McMahon · Posted: Tue Dec 04, 2012 2:17 pm Post subject:

bah, jumped the gun...ignore..
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mal crosher · Posted: Wed Dec 05, 2012 7:37 am Post subject:

apart from rear exhuast they are starting to look like trials bike engines. I guess after having a successful formula together for a few years now they are going to start looking less and less like motorcycle engines they were based off. They have their control rules like carborator size ,ignition etc with everyone seemingly happy to toe the line.

Could probably move the gear selector tho. That will probably happen next ?????

One thing you always had to keep in mind with moto engines is not having the front wheel scrub the exhuast when full compressed always came first.

I was at pro circuit once back in 2002 and Mitch Payton was doing two team kx125 pipes for the teams 2 riders at an up coming supercross round. I asked why he was building them individually on each bike with forks collapsed. He said that both riders had different suspension settings, height and tyre profile etc and they tried to build the pipe as close to the wheel without scrubbing as possible. So in short, they could get way more out the engine with longer pipe than the port angles and /or bike geometry would allow. Was same at rear end with muffler too. Rear shock collapsed etc

Tom Barth · Posted: Fri Dec 07, 2012 6:18 pm Post subject:

KZ10B is rotated rearward also. But not quite as much as MXS. But KZ10B as more of a straight in intake manifold. But both manufacturer's are putting carb as close to case as possible.

IMO there is not a 125cc engine on the face of the earth that will put out as much power as the current line of KZ engines assuming same specs. I've personally tried to get more out of the KZ with more compression, bigger carb etc. Just a waste of time and money. The 30mm carb, port angles and straight line ignition is matched perfectly to the KZ engine design.

The reason for rotating cylinder rearward is to move firing angle into a more favorable position - little more low end torque.

P.S. the older model KZ's will respond well to angled mounts and shorter intakes
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