LTH reed valve

[arthur]

now people have just completed 500 miles on my rapido 225 race reed valve goes well but now that i want to give some i think its pinking after half throttle got a squish of 1.45 and my main jet is a 144 any ideas cheers art

[sean brady scooters]

whats the comp ratio exactly,and what is your timing ?
squish would be better at 1.2 ish

[tony]

if its got det at midrange then look at midrange settings.. forget the main jet. What atomiser? What timing? What needle etc and what pipe... race rapido is a high port timing thing also so you will need to be pretty good with it to get it as driveable as poss...
I bet you are on a 264 on a 28 or 30mm carb. Try to run the largest atomiser you can. This half throttle is where the bike lives most of the time so it has to be right. 268 is more like it. Let us know the rest of the spec fella.

[arthur]

hopefully all will be sorted when it goes into the scooterotica workshop on saturday ,shame to miss Brid but i've had a poor scooter season with engines issues time to sort em..

[Andy Pickering]

hopefully all will be sorted when it goes into the scooterotica workshop on saturday ,shame to miss Brid but i've had a poor scooter season with engines issues time to sort em..

Just the right place Art, erm does this mean your staying around a bit longer..

[arthur]

well had a good day out there today learnt a thing or two,good dyno session,good spead of power thanks Dan and Sean pleased to have met yer art.

[ArmandTanzarian]

now people have just completed 500 miles on my rapido 225 race reed valve goes well but now that i want to give some i think its pinking after half throttle got a squish of 1.45 and my main jet is a 144 any ideas cheers art

Mine did exactly the same thing fitted to a Mugello. Pulled like a train but pinked mid-range. I couldn't fix it and neither could the dealer who fitted it even after several dyno sessions and two carbs. Eventually I had to ditch the JL expansion and use a box pipe. That nearly cured it but I still had to richen it to the point where the power was well down. Still goes well but nowhere near what it was with the iffy mid range.

[arthur]

now people have just completed 500 miles on my rapido 225 race reed valve goes well but now that i want to give some i think its pinking after half throttle got a squish of 1.45 and my main jet is a 144 any ideas cheers art

Mine did exactly the same thing fitted to a Mugello. Pulled like a train but pinked mid-range. I couldn't fix it and neither could the dealer who fitted it even after several dyno sessions and two carbs. Eventually I had to ditch the JL expansion and use a box pipe. That nearly cured it but I still had to richen it to the point where the power was well down. Still goes well but nowhere near what it was with the iffy mid range.

i've still got a bit of pinking but we think we know the cause which will be addressed on thursday hopfully when i've a bit more time

[ArmandTanzarian]

now people have just completed 500 miles on my rapido 225 race reed valve goes well but now that i want to give some i think its pinking after half throttle got a squish of 1.45 and my main jet is a 144 any ideas cheers art

Mine did exactly the same thing fitted to a Mugello. Pulled like a train but pinked mid-range. I couldn't fix it and neither could the dealer who fitted it even after several dyno sessions and two carbs. Eventually I had to ditch the JL expansion and use a box pipe. That nearly cured it but I still had to richen it to the point where the power was well down. Still goes well but nowhere near what it was with the iffy mid range.

i've still got a bit of pinking but we think we know the cause which will be addressed on thursday hopfully when i've a bit more time

Let us know how you get on, if mine was set up perfectly it would be easily the best scoot I've ever ridden. Masses of torque, fast and not too bad on fuel.

[Muppet]

Is the fix for the pinking somthing anyone could do or is somthing going to have to go to the machine shop.