Yeah, "reduced weight doesn't improve horsepower" but it surely improves the power-to-weight ratio, thereby improving acceleration.While it's fun to say "a reduction in weight will increase horsepower" that's not actually true. Horsepower is an engine derived calculation. Increases in horsepower can only really come from direct changes to the might TW engine, which may include opening up the airbox/re-jetting or even modifying the exhaust. Or..nitrous!! Reductions in weight and changes in gearing, rider ergos can improve handling, throttle response time and tractability. IMHO-these are the changes that really impact the attitude of the TW and my enjoyment of it.
I was just surprised by the fact that a 4t engine is restricted with an exhaust washer/restrictor, I thought only 2 strokes were restricted this way.The TW125 in the UK market is aimed at “learner drivers” – so if the bike is capable of too much horse power, the bike becomes unlawful to ride on “L” plates here in the UK
There are two primary ways of restricting the horses on the 125 – one is the introduction of a washer inside the exhaust to restrict flow – the other is more likely in the EU, and relies on the speedo cutting out the CDI
I am unaware of any other methods – if you have input, it would be appreciated
Yeah I’m still surprised there are no pumper kits anywhere. I’d try one for sure. I’m not a fan of the current glueing the intake hack.Serious reliable power increases can be had depending on your budget but none are technically cheap. Bigger valves, higher displacement cylinders and pistons, with or with out high compression pistons, stronger valve springs, etc all can increase ability of engine to pump more air/fuel mix and thus more peak horsepower. Then a better exhuast system reap some benefits. A pumper carb can help a stock or modified engine accelerate quicker. All demand time and money though.
No idea whether it’s to restrict speed on full chat rather than BHP, but it’s the way Yamaha approaches the issue for many countries with varying regulations – if you think that’s weird, try the speedo option. The needle hits 60, and it cuts power to the CDI …..I was just surprised by the fact that a 4t engine is restricted with an exhaust washer/restrictor, I thought only 2 strokes were restricted this way.
I have seen the "L" plates in some videos, but I assumed that the bikes were just A1 license compliant(up to 125cc and 15 hp,I doubt the tw125 is more as the tw200 is 16HP as far as I know).
A few of us found other ways to do it. Here's how I did it (starting with post #57): https://www.tw200forum.com/forum/performance-customization/37993-steves-87-day-mods-6.html#post796497Yeah I’m still surprised there are no pumper kits anywhere. I’d try one for sure. I’m not a fan of the current glueing the intake hack.
Great info. Thanks for that link.A few of us found other ways to do it. Here's how I did it (starting with post #57): https://www.tw200forum.com/forum/performance-customization/37993-steves-87-day-mods-6.html#post796497