2006 Yamaha Zuma - Post BBK

[zumanoob]

Hi All, I just installed a Malosi BBK,Variator (7g rollers and white contra) as well as a Yasuni R pipe.
Day one after doing heat cycles: the moped was cruising very fast and accelerated good.
Now 2 weeks later its starting to feel a little sluggish and the rpm at full throttle are about 300 lower which means I'm not really at power band anymore. Is this just the belt? do I need to put on lighter rollers? I am going to re-tighten and check for air leaks tomorrow.
All info helps. thanks.

[pili]

I’m guessing if the variator was working well before it’s good. Did you check for an exhaust leak? Maybe check torque on the head nuts too. Spark plug look normal? If anything it should run better as it breaks in.

[Zino]

Those are really heavy weights for a white contra try 5.5 grams to 6 grams
The Yasmin r paired with a malossi should be peaking at high 9000 rpm’s to low 10,s
I had my variator weights set to jump to and hold in the low 9s when I hit the throttle wide open and then it would drift up to around 10 k rpm’s

Just like pili said it should get a notch better after a couple tanks of gas

[zumanoob]

May 13, 2024 19:14:36 GMT -5 pili said:

I’m guessing if the variator was working well before it’s good. Did you check for an exhaust leak? Maybe check torque on the head nuts too. Spark plug look normal? If anything it should run better as it breaks in.

Just checked for exhaust leaks and there was nothing. I'm going to re torque the head nuts today. Spark plug is mint. Variator is mint.

[zumanoob]

May 13, 2024 20:23:47 GMT -5 Zino said:

Those are really heavy weights for a white contra try 5.5 grams to 6 grams
The Yasmin r paired with a malossi should be peaking at high 9000 rpm’s to low 10,s
I had my variator weights set to jump to and hold in the low 9s when I hit the throttle wide open and then it would drift up to around 10 k rpm’s

Just like pili said it should get a notch better after a couple tanks of gas

I found a website that said the Yasuni R has peak power at 8200 RPM and I have it basically there the whole time, I don't want to run low 10's because I am still on the OE Crank. i Did get the Polini Weight kit so maybe ill try 6 grams

[aeroxbud]

All the dyno graphs I've seen of the Yasuni R it starts to make peak power between 9-9,500 RPM.
That sounds more like what I would expect from the Yasuni Z.

[Zino]

I ran the original crank past 10,500 rpm’s at its peak with a Yasuni and Athena build

10,000 rpm’s is just a guideline for stock crank
The yasuni has a pretty wide power band you can set the weights so you peak high 9,s and get better on off throttle response