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PostPosted: Fri Mar 19, 2021 5:24 pm 
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Joined: Sun Sep 06, 2015 6:01 am
Posts: 300
Location: Metamora, MI
What tuner said.

It does pump, if working, oil and any carbon debris and crap directly into engine in a fast/bad fashion.

Without it working spreads the crap back in slowly with gasoline/petrol dilution.

c
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TracksH1F
PostPosted: Fri Mar 19, 2021 6:01 pm 
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Joined: Tue Feb 09, 2021 5:42 am
Posts: 68
Location: Timmins ON, Canada
H2RTuner wrote:
the valves are only on later H2, and they were designed to use vacuum/pressure to scavenge excess oils in the crankcase bottoms into the ftansfer ports for cleaner operation, for EMISSIONS reduction. YES, emissions.

I usually simply make one gasket, full, no holes, and use Three Bond sealer, and the valve cap, done. NOT wise to tap assembled engine ports for this, but, bottom case removed, go head on, and use the gasket/cap.

If they are only on the H2, then what are the similar looking things on my H1?

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1977 Kawasaki KZ650 being restored
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H2RTuner
PostPosted: Sat Mar 20, 2021 4:59 pm 

Joined: Thu Jun 09, 2011 11:25 am
Posts: 3146
Never seen them on an H1, might be KH500A8 only. Anyway, use, don't use, your option.
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A7RA
PostPosted: Sat Mar 20, 2021 9:44 pm 

Joined: Fri Dec 09, 2011 12:24 pm
Posts: 285
Location: Sierra's east of P'ville
Hi Dave, hope all is well with you, I just checked and they are on my 75 H1F as well as my 74 H2B.
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PostPosted: Sun Mar 21, 2021 2:58 am 
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Joined: Sun Sep 06, 2015 6:01 am
Posts: 300
Location: Metamora, MI
'73 D model does not. '74 E model does.

cliff
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H2RTuner
PostPosted: Sun Mar 21, 2021 5:48 am 

Joined: Thu Jun 09, 2011 11:25 am
Posts: 3146
Still, if the oil injection system is set up correctly, relief valve blow off pressure, cable adjustment, the scavenge valves would not be needed, nor help. The valve gaskets and reeds degrade as well, another reason to render them moot.
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DGA
PostPosted: Sun Mar 21, 2021 10:44 am 
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Joined: Thu Sep 29, 2016 4:32 am
Posts: 615
Location: Indianapolis, IN
I like the scavenge valves because they take the two stroke oil that has pooled in the bottom of the crankcase, and instead of it getting whipped up and sent through the top end to be burned as usual, in a big cloud of smoke, it is first sent through the mains and then the big end bearings, before going up top. Can't be a bad thing.

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RODH2
PostPosted: Sun Mar 21, 2021 6:05 pm 
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Joined: Thu Jun 09, 2011 7:03 am
Posts: 4604
Location: Milang, South Australia
They are the product of the times, basically an attempt to reduce unburnt hydrocarbons. A traffic jam in L.A., for example, is a different situation to a race-track or even a run thru. the mountains. They are not essential, but they did have a purpose.

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PostPosted: Tue Mar 23, 2021 4:56 pm 
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Joined: Sun Sep 06, 2015 6:01 am
Posts: 300
Location: Metamora, MI
Like I said, what tuner said.

Use 'em to drain faulty check valves and over oiling to lessen chance of hydro-lock.

Trash the reed valves and stop pumping basement crap into the mains and big ends.

cliff
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Yeddy911
PostPosted: Wed Mar 24, 2021 7:15 pm 
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Joined: Sun Feb 21, 2021 5:59 am
Posts: 154
Location: NY
Interesting thing with my old 1975 Suzuki GT380, they had stopped using their SRIS oil scavenge from my year on. It was only on 1972-1974 models.
The case on mine was plugged with bolts, which make it handy to drain any excess oil out of if needed.
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