Here's the porting we need in the 500 & 750

[Suzukidave]

[tz375]

Interesting barrel Dave. Looks like a crankcase reed motor with 4 main transfers and three exhausts but the split rear boost port is interesting. What is that one from? Is that an Arctic Cat by any chance?

Here's a few more..


Top left is Honda RS125 race bike. No exhaust valve in the wide bridged exhaust port with eyebrows.

Top right is 96 Yamaha TZ250 with 6 transfer ports, 3 exhaust ports

Bottom one is from an Aprilia RS250 twin street bike. 4 transfer ports. Very wide bridged exhaust with 3 stage valve and eyebrows reaching past the transfers.

All three use single rear boost ports.

[Craig380]

Wow, the porting in that Aprilia RS / Suzi RGV cylinder is something else It's not grinding, it's sculpture

Even if Suzuki had developed the triples' porting like it did with the 250A models, that would've been quite something.

[Suzukidave]

Interesting barrel Dave. Looks like a crankcase reed motor with 4 main transfers and three exhausts but the split rear boost port is interesting. What is that one from? Is that an Arctic Cat by any chance?

I really need to start putting a description on my pictures i grab off the net .. saying that , i dont know what the cylinder is from but it was interesting .

[tz375]

As long as I'm not the only one that does that.

[Suzukidave]

I know it was Suzuki's desire to keep the engine block as narrow as possible so they skewed the transfers , measuring the RS250 block across just how much wider would the block have been across with the better porting ? But i suppose the point is moot as there really wasn't the technology then to design such a engine was there .

[Suzsmokeyallan]

Remember this barrel Dave, now this is what I call porting.

[Suzukidave]

Oh Yeah .. pop,pop pop... CR500

[Suzsmokeyallan]

Yup and with some gentle massaging of the ports and other minor mods you can take the stock 70HP up to around 90HP.

[Suzukidave]

humm 1500cc triple with 270 hp .. ok who's going to volunteer to kick start it

[tz375]

That is remarkably similar to several years of RM250.

[Suzsmokeyallan]

Richard after you ride open class 500cc two stroke power, everything else feels lame. Modify it for more power and improve the handling to match and and then stock open class suddenly feels weak.
Its hard to describe but once you've felt it, it can become VERY addictive.

[tz375]

Allan, too much power is just that - too much to use effectively.

That's why I don't want my GT to make more than 150 in street form. 77 down, 73 to go

[Suzsmokeyallan]

You can never have too much (usable) power, it only becomes too much if you can't deliver it all to the ground in a controllable fashion.

[Suzukidave]

Its just the cost of fun if the power takes the knobs off the knobbie tire after every outing