I’d like to get a VM16 Mikuni to replace my 12mm Bing. For some reason they are 20USD more than the VM18. But going from a 12mm carb to 16mm just seems more sensible than anything bigger. The intake port on the block is no more than 14mm anyway.
So I find an "overstock special" (fraud alarms are screaming in my head, but WTF) for 26.99 on a 16mm "four stroke" Mikuni carburator.
Here’s the link. http://www.videogameaccessories.com/product.php?productid=1370
I’ll have to telephone them to find out for sure, but it looks like it’s not available for a couple of weeks if I’m reading the "RESTOCK ETA….... MAY 31, 2009" correctly on that page.
Anyhoo,,,,, now I’m wondering…. is there really a difference between four cycle and two cycle Mikunis? None of the other sources of VM16 Mikunis for about 100USD refer to them specifically as two cycle carbs. Boost pump or no boost pump? Less vacuum at idle for the four cycle? What the hell? Who knows for sure? I'm, at the moment, reading PDF files on tuning VM series carbs right off the Mikuni site
http://www.mikuni.com/pdf/vmmanual.pdf
and so far there has not even been any mention of either engine style. Weird.
If there actually IS a difference, then where’s the best place to get a 16mm Mikuni 2cycle online for my Puch? (I"m just going to tig weld together a new 16mm intake manifold for it.)