Scooterotica

want to pep up the performance of my standard tv175, am planning drilling through mushroom baffle in pipe, removing baffle from airbox and open out air scoop and getting the carb reamed out to 21.5mm as per performance tuning & conversions manual, anyone been down this road?
regards
dave

I would say the result would be a modest increase in performance and a generous increase in exhaust noise. Are you sure your exhaust has a mushroom baffle though? You'll need to upjet the carb as well but I'm sure the Performance Manual mentions that

Get ye sen a proper stage 4 tune good quality piston 26 mm carb and good quality clubman..bangs for bucks, ye can't beat it......unless you spend big cash of course

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prob better to just swap to a 22mm GP carb and manifold rather that ream out the 20mm and stick it back on the 20mm manifold
also just skip the std silencer and maybe use a scoot RS pipe or sterling ...

sean brady scooters wrote:prob better to just swap to a 22mm GP carb and manifold rather that ream out the 20mm and stick it back on the 20mm manifold
also just skip the std silencer and maybe use a scoot RS pipe or sterling ...

I remember on my 185,started with a 20,then moved to 22..26.....settled for a 30
Difference was amazing...i was a bit younger so knew a bit less

^.... Soosh, shhhhush! These days lots of people have confused BIG vs small carb issues, following some high publicity features that didn't truly explain how reed valve motors and piston port motors hugely when it comes to performance and carb size.

However, that's a different thread all together!

Adam

Adam_Winstone wrote:^.... Soosh, shhhhush! These days lots of people have confused BIG vs small carb issues, following some high publicity features that didn't truly explain how reed valve motors and piston port motors hugely when it comes to performance and carb size.

However, that's a different thread all together!

Adam

Also,as we are saving bucks on oil now..i dont give care about fuel consumption so big carb it is

thanks for the answers, but im not looking for a noisy rev monster, got one of those allready, the tv`s getting a rebore and whilst its apart i`m wanting to give it just a bit more umph without making it too loud or thirsty, and the price of genuine del orto`s is prohibitive, and jetex`s are shite.If i succeeded in increasing the flow of mixture in and out, and it was jetted correctly would this mean the motor revved more but produced the same power per bang, or would each bang produce more power?

If it's in for a bore, why not get it bored to 200? A standardish piston isn't dear (and you'd be buying one anyway). Head can be modded for greater efficiency. A half decent clubman wont cost you much. And a TM24 or a Delorto 25 wont cost you much either. A 28 or 30 delorto isn't expensive either. Big carbs aren't necessarily bad on fuel. Any poorly set up carb is going to drink more than it should.

you'll need a 66mm (200cc) piston to suit a TV175 length conrod. Can you still get them?

Wasn't this the method used in UK prior to TV200 being officially produced by Innocenti?

Chris