SV650 v RGV250.

I'm not sure whether this has been covered on this forum so apologies if it already has, here goes anyway:

Having recently read the two-stroke artical in Bike magazine it sparked off my interest and facination in said engine type. I have owned many a two-stroke in the past and my bike before the SV was an imaculate RGV250 (which I now regret selling!)

Anyway, it just amazes me that a 250cc v-twin two-stroke produces nearly the same power as a 650cc v-twin four-stroke and side-by-side an RGV250 and SV650 are pretty much identically mached performance wise. In fact, if I'm not mistaken,the RGV has a higher power to weight ratio than the SV...?

Just some food for thought...

Bring back two-strokes I say

two stroke's were great no doubting power wise they were top dog however economically their **** for engine's going pop lot's of regular servicing needed and two stroke oil is expensive and mine used to love the stuff however fun wise nothing touches em i agree with you 100%.

2 strokes produce the power after only 2 strokes compared to 4, but they don't last as long and emit a lot of crap (burn oil).

Fine for lawn mowers etc where you don't rack up the mileage.

there is a way to clean up a two stroke engine though can't remember the company but they managed to get one running clean to eu standards or some **** like that.

[squirrel_hunter]

Originally Posted by daveb

Bring back two-strokes I say

Agreed.

Funny tho - an SV requires a fairly substantial top end strip-down to check valve clearances at 15k which would be quite daunting for many home mechanics yet most would have no problem stripping down the top-end of an RGV after 10k miles to replace the rings and check the exhast valves - way simpler imo - four strokes are infinately more complex in comparison which to me outweighs the cost of replacing the odd piston every 20k miles.
Plus the build quality on the likes of an RGV compared to the SV is just stunning - there really is no comparison...

Current development of two-strokes are performing more efficiently than 4-strokes and pretty much producing twise the power - it's just a shame that the big names don't want to go down that road as they are happy selling four-strokes to the masses...

two stroke engine's would have gone the same way if they'd have kept developing them getting more and more complex just the way it goes.

Originally Posted by daveb

Current development of two-strokes are performing more efficiently than 4-strokes and pretty much producing twise the power - it's just a shame that the big names don't want to go down that road as they are happy selling four-strokes to the masses...

Honda decided to bin the 2 stroke development on their offroad bikes a few years ago.

Shame really as my 200 2 stroke was only 5bhp less than my mates crf450

A car company (perhaps lotus) is currently working on direct injection 2 stroke car engines that produce stupid power, weigh nothing and don't throw out loads of rubbish.

No matter how much people love 4 strokes its fact that 2 strokes are lighter, have less moving parts and produce almost double the power per CC. I really hope they make a come back as they are much more eco friendly