Hi guys,
let me introduce first: i'm Jan, from Belgium, born in 1976 and also ower of a 1976 pawpawgreen oem honda Z50 monkey. Been lurking here for the last couple of months
I converted it to a motorcycle, as stock look as possible, with a new honda ca. 110cc block, kitaco suspension front and rear, sporty tires, here are some specs:
GB4 cases,
49,5mm stroke, 53mm bore, flat piston,
modified C50 head with roller bearing cam with roller rockers from uma racing.
Takegawa multi plate clutch, hydra actuated and 4 speed manual box.
It's 12V CDI, with simple YX type ignition and batteryless kit.
Exhaust is 'standard style' but obviously much bigger diameter.
I'm running a yoshi MJN TM24 carb at the moment.
Stock wheels on reasonably low profile tires, and 16-24 gearing...should reach easy 120km/h in theory.
The bike pulls very nicely, and i can hear it scream in lower gears, but i'm getting no topspeed. I'm struggling to reach 90 km/h GPS. So i have all the rpm, but not enough horsepower. Especially as this is a oversquare engine, it should be strong up top.
I am a little bit stuck at the moment because i can't get it running the way it should: it should be a very fast screamer, but it's not. After lots of messing with 2 cheapo carbs, both big and small, i changed to the yoshi flatslide TM24 thinking that would be the reason i'm getting no serious top-end out of it. But it didn't make a change. (of course i have fabulous ridiculous throttle response now, but still no top-end. Jetting is correct)
I am suspecting ignition advance now. Idle ignition timing is on the left stripe next to the 'F' mark, but i'm getting no high rpm advance whatsoever. It changes maybe 1 or 2°. I tried with 3 different CDI boxes. I would assume there should be plenty advance added at higher rpms right? My car is 5° BTDC at idle, and 30° at 4K rpm...
So is this advance normal? (basically same advance over full rpm range) and if it's not, what can there be wrong? Is it a simple case of wrong CDI? Do i need a power rev or something? I tried running the bike with just the basic 3 or 4 wires and it makes no difference. So i don't suspect the wiring at the moment. Can the yx ignition voltage supply be too low causing the CDI boxes to run safe mode?
Thanks for your input,
cheers, Jan
let me introduce first: i'm Jan, from Belgium, born in 1976 and also ower of a 1976 pawpawgreen oem honda Z50 monkey. Been lurking here for the last couple of months
I converted it to a motorcycle, as stock look as possible, with a new honda ca. 110cc block, kitaco suspension front and rear, sporty tires, here are some specs:
GB4 cases,
49,5mm stroke, 53mm bore, flat piston,
modified C50 head with roller bearing cam with roller rockers from uma racing.
Takegawa multi plate clutch, hydra actuated and 4 speed manual box.
It's 12V CDI, with simple YX type ignition and batteryless kit.
Exhaust is 'standard style' but obviously much bigger diameter.
I'm running a yoshi MJN TM24 carb at the moment.
Stock wheels on reasonably low profile tires, and 16-24 gearing...should reach easy 120km/h in theory.
The bike pulls very nicely, and i can hear it scream in lower gears, but i'm getting no topspeed. I'm struggling to reach 90 km/h GPS. So i have all the rpm, but not enough horsepower. Especially as this is a oversquare engine, it should be strong up top.
I am a little bit stuck at the moment because i can't get it running the way it should: it should be a very fast screamer, but it's not. After lots of messing with 2 cheapo carbs, both big and small, i changed to the yoshi flatslide TM24 thinking that would be the reason i'm getting no serious top-end out of it. But it didn't make a change. (of course i have fabulous ridiculous throttle response now, but still no top-end. Jetting is correct)
I am suspecting ignition advance now. Idle ignition timing is on the left stripe next to the 'F' mark, but i'm getting no high rpm advance whatsoever. It changes maybe 1 or 2°. I tried with 3 different CDI boxes. I would assume there should be plenty advance added at higher rpms right? My car is 5° BTDC at idle, and 30° at 4K rpm...
So is this advance normal? (basically same advance over full rpm range) and if it's not, what can there be wrong? Is it a simple case of wrong CDI? Do i need a power rev or something? I tried running the bike with just the basic 3 or 4 wires and it makes no difference. So i don't suspect the wiring at the moment. Can the yx ignition voltage supply be too low causing the CDI boxes to run safe mode?
Thanks for your input,
cheers, Jan