I am not aware of any with a check valve. We do have some restrictor pills in them for water flow tuning;
https://watcon.com/products/quick-disconnect-water-restrictor-1
Honestly how many Yamaha's are still running around with OEM electrics from the 90's or before? There are a ton out there, and people quite literally ride these things hard, and put them away WET. The OEM stuff is really good.
Thanks for watching!! I know my numbers are different than what MSD used to post in their ads as far as timing goes....... I remember OSD well, but don't remember what his test results were.... I have tested many MSD enhancers here lately, one new out of the box, and a bunch for Tom @ Hot...
If Art modded your carbs, they are now better than stock. Regular off the shelf universal 44's are really good. OEM carb are just that. They are designed to meet OEM Specs, and EPA standards. The low speed circuit is different than performance carbs.
62t is by far my favorite. We learned this many years back from switching couch engines into to Sqaures. They run really good! Easy to do a quick port match, but even left alone they can really run well. Personally I am not a fan of the stock 44's. I would go stock 38's, or if you do want 44's...
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