Aprilia RS 500 conversion

[getitupya]

Hi folks,

Just wondering if anyone has any experience or knowledge of converting an RS250 to a 500. I have been trawling google and it would seem there has been a couple (of tricky) RG500 engine transplants plus a better looking option from some Aussie two stroke tuners TSS.

http://www.twostrokeshop.com/two_stroke_shop_engin...

I have just bought a RS250 from the bay, but this conversion sounds like a lot of fun.

Whats your thoughts??

[FM]

If you can put up with the hassle...sounds good.

[R5GTTGAZ]

I'd drop it off at Stan Stephens and get a 300cc conversion done as well as an engine build. Should come in at about £1200 for a well tuned set up. The difference is amazing compared to the stock 250.

[TELLIS302000]

kin ell, that 500 gp motor looks well trick!!!

[rhinochopig]

getitupya said:

Hi folks,

Just wondering if anyone has any experience or knowledge of converting an RS250 to a 500. I have been trawling google and it would seem there has been a couple (of tricky) RG500 engine transplants plus a better looking option from some Aussie two stroke tuners TSS.

http://www.twostrokeshop.com/two_stroke_shop_engin...

I have just bought a RS250 from the bay, but this conversion sounds like a lot of fun.

Whats your thoughts??

I read that article in MCN - didn't they say a complete bike (RS250 fitted with their 500 engine ~ 110bhp) would be around 7k. I'd much rather that than a 600cc bike TBH.

[s3fella]

TELLIS302000 said:

kin ell, that 500 gp motor looks well trick!!!

I have an RS250, and have also ridden an ex GP 500 yamaha, (Pagetts bike). Possibly a bit detuned from it's hay day and there were quicker out there, but OMG, truly bonkers, vicious was not the word!

I'd kill for a proper sorted 500 v4 2 stroke road bike!

[getitupya]

R5GTTGAZ said:

I'd drop it off at Stan Stephens and get a 300cc conversion done as well as an engine build. Should come in at about £1200 for a well tuned set up. The difference is amazing compared to the stock 250.

Thats sounds a good idea, the $7000 + for the 500 kit is pushing it a bit. Do you know what bhp the 300 cc conversion makes?

[R5GTTGAZ]

getitupya said:

R5GTTGAZ said:

I'd drop it off at Stan Stephens and get a 300cc conversion done as well as an engine build. Should come in at about £1200 for a well tuned set up. The difference is amazing compared to the stock 250.

Thats sounds a good idea, the $7000 + for the 500 kit is pushing it a bit. Do you know what bhp the 300 cc conversion makes?

http://www.stanstephens.com/rgv.htm

Around 75-80bhp which in the RS250 is going to be awesome. A 400 supersport tune should be fine as long its not your everyday bike.

[getitupya]

R5GTTGAZ said:

getitupya said:

R5GTTGAZ said:

I'd drop it off at Stan Stephens and get a 300cc conversion done as well as an engine build. Should come in at about £1200 for a well tuned set up. The difference is amazing compared to the stock 250.

Thats sounds a good idea, the $7000 + for the 500 kit is pushing it a bit. Do you know what bhp the 300 cc conversion makes?

http://www.stanstephens.com/rgv.htm

Around 75-80bhp which in the RS250 is going to be awesome. A 400 supersport tune should be fine as long its not your everyday bike.

Thanks for that, it wont be my everyday bike, so if its a bit lively it should just make it more fun. If money was no object, I would be going for the TSS 500 GP though!!

[R5GTTGAZ]

For about $4k US you could get a 70 odd bhp 4 stroke SVX550 V twin lump in from the Aprilia Supermoto, that would be awesome. You could even have electric start.

[rhinochopig]

R5GTTGAZ said:

For about $4k US you could get a 70 odd bhp 4 stroke SVX550 V twin lump in from the Aprilia Supermoto, that would be awesome. You could even have electric start.

Yeah but you're missing the point. The 550 lump won't go ringggg tingggtinggggtinggtingtng when you blip the throttle. It just won't smell right either.

[Beemer-5]

I had a tuned RG550 engine in a RG250 chassis around 15 years ago.
Stan Stephens did the engine work and Beeline Racing did the chassis adaptions.
It had 130 bhp and weighed 120 kgs.
It was super-quick for then, still fast for now!

[getitupya]

Beemer-5 said:

I had a tuned RG550 engine in a RG250 chassis around 15 years ago.
Stan Stephens did the engine work and Beeline Racing did the chassis adaptions.
It had 130 bhp and weighed 120 kgs.
It was super-quick for then, still fast for now!

Wow, that must have been very special back then....how much did it cost you?? where did it go?? 500GP bikes of that era weighted more!!

[rev-erend]

Beemer-5 said:

I had a tuned RG550 engine in a RG250 chassis around 15 years ago.
Stan Stephens did the engine work and Beeline Racing did the chassis adaptions.
It had 130 bhp and weighed 120 kgs.
It was super-quick for then, still fast for now!

Nutty.. must have been fun

[Beemer-5]

The bike had the bigger engine in when i got it, but had not been finished, as the owner ran out of time and money.
Stan gave it 50 extra cc and a shed-load more power, i did some of the rest myself and Beeline Racing did the remainder.

It was incredibly quick for a mere 550cc, but was a little peaky though, so needed to be ridden with care, or you could easily drop out of the powerband.
Huge Lectron carbs were the main reason as they worked best above 5,000 rpm.

Edited by Beemer-5 on Tuesday 21st April 11:09

[nakedninja]

Oh my.


I need that.

[littleredrooster]

On the last Sunday of every month, our local pub has a 'TwoStroke Sunday', This attracts many nutters, one of whom has an RS250 with a 500 conversion. It is a work of art, and sounds marvellous. I'll try to get some photos/details this Sunday.

P.S. Shoulder of Mutton, Grandborough, Warwickshire if anyone's interested.

Edited by littleredrooster on Wednesday 22 April 06:37

[R5GTTGAZ]

Google 'TSS two stroke'

THey are based in Australia but have developed a 500 engine with mega power for the RS250, if the full bike comes out I am putting down a deposit.

[Beemer-5]

I'd say my old 'RGV550' would likely stick to the numberplate of any production 2009 bike, mainly due to the very light weight of 120 kgs.