Carb size for tuned engine ?

[ozzysbikes]

I know it's a bit of a how long is a piece of string but I am asking for general experience, what size carbs have been fitted to a 350 YPVS, I'll get a mid range road porting job done, already has a Zeeltronic and Micron exhausts (maybe not the best performance choice but they are period so I like them), I don't want a highly strung thing that only feels right when thrashing,
So are 28mm keihin carbs big enough when the porting and plus 1.5mm bore is done or should I go bigger ? I don't think I need to be looking at TZ style 38mm power jet carbs, just a general opinion please

[midlifecrisisrd]

28's are more than enough

Even the standard 26's are good for 70hp

The pwk's will help the midrange

Steve

[reedpete]

A TZ is a piston port motor so will need much larger carbs than same size reed valve motor. As above 28, with 30, 32 as absolute max are useable.

[ozzysbikes]

Thanks for the replies, PWK 28,s it is then,

Re the TZ carbs, I ran a 350 TZ in my miss spent younger days so I am well aware what one is, still my favourite bike ever, just so amazingly good at it's intended use, fantastic things, everyone should have a few sessions on a TZ or if it's possible a similar spec RD,

I was just making a point that I don't want great big carbs on it, not usually the making of a good road ride.

[bare]

Pwks work well. Better than their Nominal throat size suggests. They are of far More advanced design than the usual mikunis.

[Tobyjugs]

Hi Ozzy i just want say keep an eye out when you adjust your throttle cable to suit the 28 mm PWK's the amount of movement in the 1 into 3 cable slide is critical. If it's a little out the slides wont lift all the way up, you could end up with 3/4 throttle instead of full throttle.