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 Post subject: KR 750 Barrel
PostPosted: Mon Apr 18, 2016 6:00 am 
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Joined: Thu Jun 09, 2011 3:06 am
Posts: 4364
Location: PARIS FRANCE
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as we know there're not enough room for the transferts on H2, so on KR the intakes and exhausts ports are not fixed at 90 ° compare to the crankshaft inside the crankcases but are nearly perpandicular to the crankshaft inside the crankcases. This helps a lot to have bigger rooms for the transferts ports.
Notice also that the intake ports are very closed from the bottom of the barrels this means the pistons at the bottom dead center are really on the bottom of the barrel sleeve. This explains why there is bridgeport on the intakes.
As you know Suzuki did the same on his GT 750 2 stroke :mrgreen:

Notice also there're six studs on the exhausts side on which the engine is hoter so the barrel can be deformed and only four studs on the intakes side 8-)


Last edited by husson73 on Mon Apr 18, 2016 7:49 am, edited 2 times in total.

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 Post subject: Re: KR 750 Barrel
PostPosted: Mon Apr 18, 2016 7:04 am 
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Joined: Thu Jun 09, 2011 7:03 am
Posts: 4603
Location: Milang, South Australia
Hmmm, nice transfers, (I'll take 2 sets, please...!)

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 Post subject: Re: KR 750 Barrel
PostPosted: Mon Apr 18, 2016 7:51 am 
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Joined: Thu Jun 09, 2011 3:06 am
Posts: 4364
Location: PARIS FRANCE
Rod, sorry have only on set apart my engine with a brand new head still in the plastic with a sticker with the part number on it like any Kawasakki parts :shock:


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 Post subject: Re: KR 750 Barrel
PostPosted: Mon Apr 18, 2016 7:55 am 
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Joined: Thu Jun 09, 2011 7:03 am
Posts: 4603
Location: Milang, South Australia
You are out of my will, J.P. :lol:

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 Post subject: Re: KR 750 Barrel
PostPosted: Mon Apr 18, 2016 11:46 am 

Joined: Thu Jun 09, 2011 11:25 am
Posts: 3137
Yes, the transfers, for all intents and purposes, are somewhat larger, but, not better than H2R attempts. The actual aiming angles into the bore are not as good as they should be, and there really isn't enough room to make them much better.

Although volume helps here, aiming the mixture into the right places when the loop scavenging occurs, is paramount to getting a two stroke to be efficient in transfer operations. If the angles, and mixture paths are not advantageous, short circuiting will occur if the angles are too acute, which moves transfer mixture not to the correct place in the cylinder, but straight out the exhaust. This leans the fill to the rear of the loop, leaning the captured mixture out, no matter how the jetting is.

In my files, I have a port angle study between the H2R and KR759 vs TZ 700/750, vastly different, even with the reeds on the Yamaha, transfer angles significantly different.

Just "hoggin' them transfers out" makes more problems than helps.

JP, if you would PM me with a real world email address, I will send you that page.


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 Post subject: Re: KR 750 Barrel
PostPosted: Mon Apr 18, 2016 12:24 pm 
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Joined: Tue Jun 07, 2011 6:37 am
Posts: 10460
Location: Rio Rancho, New Mexico
Talk about a brick O Aluminum.......... ;) :mrgreen:

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 Post subject: Re: KR 750 Barrel
PostPosted: Mon Apr 18, 2016 12:47 pm 
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Joined: Thu Jun 09, 2011 3:06 am
Posts: 4364
Location: PARIS FRANCE
Dave my personnal email adress is on my profile 8-)

John not only a brick...


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 Post subject: Re: KR 750 Barrel
PostPosted: Wed May 11, 2016 6:50 pm 

Joined: Tue Aug 13, 2013 10:22 am
Posts: 865
Location: Dayton, Ohio
Very Cool JP and thanks for posting, neat to see such a rare piece

THX Phil :thumbup:


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 Post subject: Re: KR 750 Barrel
PostPosted: Fri Aug 19, 2016 6:09 pm 

Joined: Fri Aug 19, 2011 3:15 am
Posts: 224
Location: Kingdom of the Netherlands
The earlier KR cylinders have a bridged exhaust in addition to bridged inlet. I'll take a couple of pics tomorrow.


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 Post subject: Re: KR 750 Barrel
PostPosted: Sat Aug 20, 2016 11:56 am 

Joined: Sun Sep 18, 2011 10:14 pm
Posts: 298
Location: East Troy, WI
Neat!


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