Aprilia sr 180 project- only does 60mph

Hi All

My first post

I recently bought an aprilia sr 180 for nostalgia (had an sr 50 yonks ago)

Stripped her down and it's got a dellorto 20.5 pvhb carb with a 85 jet

Everything else seems to be standard , it's only doing 60mph , thinking it should be doing alot more

Any advice or info welcome

 

i was watching a few sr 180 youtube vids and noticed most were running upgraded exhaust systems. maybe the motors getting held back bythe stock pipe setup ?

a sr180 owner would be able to offer more help, but i would look into the stock pipe see if thats holding you back some what. i doubt a large bore scoot motor would be restricted in any way but the pipe itself ( emissions wise via a cat converter)

and welcome to the scootershack 83sr

 

Are you sure it's a 180? An 85 main jet is about std for a 125, so 60mph would be about right!

 

Eeeek will have to investigate more when I get back home marsh , I've literally just bought her had a play then had to go back to work . Only thing I can say it's registered on the tax book as a 180cc , that's not to say it's been put back to stock :-/ Thanks for your reply

 

Hey Tamiyacowboy

Many thanks for your reply

Will have to investigate a little more when I get home

 

An easy way to check if it's a 172cc is to see if the spark plug is straight, a 125cc will be inline with the barrel/head. On the Malossi barrel the plug faces up a few degrees, not 90 degree to the head cowling plus it would need at least a 90 main jet and do 70mph easy on the std gearing and rev it's lungs out! And the big give away is MALOSSI cast on the side of the barrel!

 

I've just checked and the is a Malossi cast on the side of the barrel

 

Barrel imaget

 

i wondered if the prilly sr 180 is running the 125cc rear box, if so there is a gear up kit for the prilly sr 125cc

https://www.beedspeed.com/gear-malossi-secondary-125cc-aprilliagilerapiaggi-p-3523.html

 

Thank for your reply , Ill check the tyre size and report back. How you go about de restricting the rev limiter? It def feels like its stoppong short on the revs. I have a rev counter i can test max rpm with at home , any idea what i should be expecting?

Cheers

 

Thanks for your reply? if possible How do i de restrict the rev limiter

cheers

 

The dellorto 20.5 carb was a standard fitting on the 125's.
The will work on the 180's, but a 28mm will be better.
Plus change the standard pipe for a decent aftermarket one.
better vario as well.
Then good tyres and brake pads