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k37 or pz28 carbs for SV Dnepr K750?

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hello people of the internet.


im strongly thinking about changing my k302 carbs out for either my old pair of original k37 carbs or the pz28 I have laying around.

Since the K302 is running WAY to rich, and I have tried rejeting, rebuilding, new spark plugs, hotter spark plugs, timing, ignition you name it, but they just won't run "normal" and always foul up the spark plugs.


So those got to go, but I wanted to know, if you guys recommend either the pz28 or the k37 pairs of carbs, when it comes to the size (24mm vs 28mm), since I have read that many people have stated, that 26mm should work best for these old SV engines, and I have read that many have been using the pz28 carbs.


I haven't been able to find any information about the k37 carbs, when it comes to needle hight or jet size and all that. But also about, with size carb will work best for my old Dnepr, when comparing these 2 against each other.


And if I go with the K37 carbs, should I use the original needle jet with the holes in the top of it, the one that the needles slides up and down in, or the pz28 needle jet, since the k37 is around 5mm longer (from the treads and up) compared to the pz28´s needle jets.


The last thing, the k37´s jets say 150, but they look similarly sized to the pz28´s .92 jets, how big is this jet actually? since I can't find any information about, how big these old actually are, compared to keihin or Mikuni jets.


the carbs:

PZ28D (28mm) (PL10 stamped on the front?)

main jet: .92 (properly need a 95 or 98 jet to work correctly)

idle jet: ? (a screw with a taper in the end)


K-37 (24mm)

main jet: 150

idle jet: 04


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Have you come across the Article by Ernie Franke on Russian carbs - accessible through the Russian Iron Website. Some material here on K37 and later carbs, and reference to main jets on K37 were 160 main jets.



nope I haven't, but im definitely going to check it out ^^ since one of the k302´s slide just broke :/, and I just fitted the k37 carbs so I could get home, but it won't even come with a little "PoP" when Im kicking the bike over, and even tickling it will only let it run for around 1 second, and the spark plugs are all dry and clean with great spark, not even sooty or anything, and I have cleaned them like I always does with carbs, checking for free passages and all of that, so im thinking about trying out the pz28 to see if I even can get it up and running, if not.. then im kinda lost ^^" since these are the most annoying carbs on any bike I ever have encountered


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