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Molto Verboso
One or two fun scoots....nothing too precious
Joined: UTC
Posts: 1984
Location: UK (South East)
 
Molto Verboso
One or two fun scoots....nothing too precious
Joined: UTC
Posts: 1984
Location: UK (South East)
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Does anyone know if the new cylinders have different porting to the 2013/2016 kits (MHR and Sport), or is the separate/steel exhaust stub the only difference?
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Ossessionato
V range 50s
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Ossessionato
@108 avatar
V range 50s
Joined: UTC
Posts: 2413
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swa45 wrote:
Does anyone know if the new cylinders have different porting to the 2013/2016 kits (MHR and Sport), or is the separate/steel exhaust stub the only difference?
What is this mate???

Oh no… I found it on SIP and scooter center…

Why’d they have to go and do this, just when real life work was picking up…

But looks like nothing much has changed… the exhaust flange seems more for racers and the ability to swap it out if needed.

Was hoping they went even more aggressive on the port timings

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Jet Eye Master
PX221 MHR, O tuned PX200, PX125 and some motorbikes
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Location: London UK
 
Jet Eye Master
PX221 MHR, O tuned PX200, PX125 and some motorbikes
Joined: UTC
Posts: 4606
Location: London UK
UTC quote
swa45 wrote:
Does anyone know if the new cylinders have different porting to the 2013/2016 kits (MHR and Sport), or is the separate/steel exhaust stub the only difference?
You we're the first to notice. All info says its the same timing. Hopefully will be a while before I ruin my new MHR kit and need one.
Using an O ring exhaust with springs, I can't see how this is any better. Now it has another point where it can leak or fall off. Although will be easier to tune the exhaust Port, always a silver lining somewhere.
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Molto Verboso
One or two fun scoots....nothing too precious
Joined: UTC
Posts: 1984
Location: UK (South East)
 
Molto Verboso
One or two fun scoots....nothing too precious
Joined: UTC
Posts: 1984
Location: UK (South East)
UTC quote
Interestingly, the SCK video is referring to a keystone piston ring and the need to fit it the correct way round, which I thought we'd established was no longer used, since Malossi started to use the Vertex piston. Can anyone confirm one way or the other?

@safis avatar
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Ossessionato
1979 P150X, 1983 P200E, 1987 PK125XL Elestart, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
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Location: Veria, Greece
 
Ossessionato
@safis avatar
1979 P150X, 1983 P200E, 1987 PK125XL Elestart, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
Joined: UTC
Posts: 4330
Location: Veria, Greece
UTC quote
They never ditched the keystone type ring, even with the Vertex pistons…
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Molto Verboso
One or two fun scoots....nothing too precious
Joined: UTC
Posts: 1984
Location: UK (South East)
 
Molto Verboso
One or two fun scoots....nothing too precious
Joined: UTC
Posts: 1984
Location: UK (South East)
UTC quote
Thanks SaFiS, I just bought the MRP CNC head for my MHR, so I'll check the ring orientation when I when the cylinder and fit the head this weekend
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