Rpms at wot vs rpms half throttle By twowheeler (Read 296 times)

[twowheeler]

So I saw another post where after a BBK install he had some roll on throttle sputter getting back on the throttle and lowering the needle helped. Ive been having this problem so i did a needle lower as well. Whats happened is the thing runs so much better! BUT the rpms have risen thru out the acelleration range. Instead of holding 7500 from start to crusing speed up to 35 it now reads 7800 and 8100 up to 35.

Why did this happen?

Ive tuned my weights to keep under 8000 and cruise at a comfortable speed. Now those rpms are a little high.

The question is if I can hold that 8000 rpm 35 mph at half throttle. Is there any difference running at 8000 and not doing it at WOT vs mashing the throttle and using the main jet to maintain cruising speed at those same rpms?

[Alleyoop]

What happened when you lower the needle is you leaned it out therego little more power higher rpms.
So getting those results it was running a little rich in the midrange before the needle completely comes out of the defuser and the full effect of the main jet takes effect.
Alleyoop

[twowheeler]

So is a scooter tach meant to be read the same way as a car tach?

In a car the powerband is not as important as it seems on these small 50s. Every tach Ive seen redlines at 8000 and my mustang at 6500 but i get plenty or power well below that 6500 rpm and wouldnt think of cruising at 6500 in a car but when it comes to a scooter theres a pretty big difference in performance acellerating and cruising at 6500 than there is at 8000, so is it ok to cruise at 7900?

[Alleyoop]

You forget you only have 1 CYLINDER creating power to move the weight, while your Mustang has 8 cylinders making lots of low end power to get the weight moving so it does not need a lot of rpms to move the weight.
Alleyoop