Originally Posted by THE DOCTOR
What restrictor is in the Ninja .21 on-road engine? Do they make smaller sized ones for this engine? I am just wondering if I can't make time with this engine again when I go out next year, I maybe better off putting a restrictor in for the qualifiers and switching back in the mains.
I think that it might be better to just make time in the qualifiers and be alittle bit slower then coming in for a splash. Or would it be better to switch to 20% fuel? Any thoughts???
The On-Road .21 comes with a 8.5mm restrictor.
Yep, they make a 9mm (the max permitted) and a 8mm, 7.5mm (Stock on the Off-Road) and 7mm (AFAIK).
Don't stress yourself with this, the 8.5mm makes a lot of runtime (in fact, all the people I've seen makes easily 6minutes with the 8.5mm). Some time ago tried a 8mm restrictor and the carb adjustment was somewhat difficult, because the LSN was too rich and you had very little margin of adjustment going from too rich to too lean. On those moments missed to have a third needle to get more control on the LSN.
Planning to test the 9mm another time, last tests I did hurt the runtime without so much additional power. Maybe it needs further adjustment.
Better to not mess with different fuels for qualifiers and mains, stick to a fuel and work with it to suit your needs. Go with a 25 or 30% nitro and you will not be dissapointed.
What kind of pipe you plan to use? If you don't have one, get the ninja pipe and the short manifold.
BTW: Check your combustion chamber height before starting the engine!!! Look on the previous posts what happened to someone who didn't checked it.