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Post by scooternub on May 13, 2021 18:32:27 GMT -5
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Post by Zino on May 13, 2021 19:43:55 GMT -5
I have run both the silent pro and Yasuni R
Yes the yasuni r is probably the best expansion pipes for a sport to midrace build . which means a build that is happy at 8500-9500 rpms and 9500 to 11000 rpms.
It has a Wide Powerband for and expansion pipe but you will still need lighter weights to spin up in the power band and stiffer clutch springs then the silent pro . Set up the transmission right you will have close to the same take off but pick up 3-5 mph Top Speed from the higher rppms.
It is alot louder My neighbors can hear me coming from half mile away when I am wide open flying home.
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Post by scooternub on May 13, 2021 20:03:14 GMT -5
I have run both the silent pro and Yasuni R Yes the yasuni r is probably the best expansion pipes for a sport to midrace build . which means a build that is happy at 8500-9500 rpms and 9500 to 11000 rpms. It has a Wide Powerband for and expansion pipe but you will still need lighter weights to spin up in the power band and stiffer clutch springs then the silent pro . Set up the transmission right you will have close to the same take off but pick up 3-5 mph Top Speed from the higher rppms. It is alot louder My neighbors can hear me coming from half mile away when I am wide open flying home. sport aka 70cc bbk?
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Post by Zino on May 13, 2021 20:43:22 GMT -5
The yasuni will work with a stock 49cc . It is just so much more fun with a 70 cc kit
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Post by aeroxbud on May 13, 2021 23:28:12 GMT -5
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Post by scooternub on May 14, 2021 8:10:01 GMT -5
The yasuni will work with a stock 49cc . It is just so much more fun with a 70 cc kit I bet fun. Z says for 50cc - 70cc but for if at 50cc and later upgraded to 70cc I'm guessing r/07? Z saves a lot of money. I viewed a bbk 2stroke install video, looks easy but can be difficult for rings and ring positioning and the wrist pin locks, I been considering it. What I would be worried about is the age of the minarelli motor parts like crank etc at over 12k miles if everything would be able to handle 70cc. Thoughts?
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Post by Zino on May 14, 2021 8:26:23 GMT -5
A yasuni Z pairs great with builds you want to stay under 10 k rpms . The Yasuni R is for Racier Builds and Higher RPMs
If I was only allowed to do one thing I would choose a 70 cc kit over a new pipe .
A 70 cc install is about the equivalent of doing a brake job on a car . Take your Time take alot of pictures long the way . Use a torque wrench .
The Naraku kit is less than 100 bucks Has Low rpm grunt and would really pair nice with you tecnigas pipe .
12k miles If you are nervous about if your scoot can handle it. You dont want to pair a higher Rpm pipe Like the Yasuni R to it .
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Post by scooternub on May 14, 2021 9:54:21 GMT -5
A yasuni Z pairs great with builds you want to stay under 10 k rpms . The Yasuni R is for Racier Builds and Higher RPMs If I was only allowed to do one thing I would choose a 70 cc kit over a new pipe . A 70 cc install is about the equivalent of doing a brake job on a car . Take your Time take alot of pictures long the way . Use a torque wrench . The Naraku kit is less than 100 bucks Has Low rpm grunt and would really pair nice with you tecnigas pipe . 12k miles If you are nervous about if your scoot can handle it. You dont want to pair a higher Rpm pipe Like the Yasuni R to it . would this be the kit for my motor? says it's for horizontal which mine is. www.partsforscooters.com/137-26-Naraku-Cylinder-Kit-Minarellialso my stock 17.5 mm mikuni carburetor be fine with a kit?
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Post by scooternub on May 14, 2021 10:11:57 GMT -5
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df41590
Scoot Enthusiast
Posts: 285
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Post by df41590 on May 14, 2021 12:22:06 GMT -5
You don't have to some guys choose to do it with the engine still in the frame. Me I always pull the motor just makes it a lot easier. Pulling the motor is super easy. Just two bolts, connectors for stator and starter, and take the carb out of the intake then ziptie it to the frame and bam she's out. You can keep the stock Mikuni carb for a 70cc sports kit just need bigger main jets.
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df41590
Scoot Enthusiast
Posts: 285
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Post by df41590 on May 14, 2021 12:24:14 GMT -5
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Post by scooternub on May 14, 2021 15:06:35 GMT -5
If I do choose to do it I got a come along and straps n a garage.
Then I could probably actually get to change the bushing for the main bolts of the motor to the scooter, cuz I seen that they are pretty bad shape.
Hand wrench the bolts or impact wrench?
Any links to help me out removing the engine with pictures or video? Minarelli.
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df41590
Scoot Enthusiast
Posts: 285
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Post by df41590 on May 14, 2021 15:58:40 GMT -5
Can't find a video, thought there was a how to in the Tech Library on this forum but can't find it. You can use an impact for removal and install but be careful when tightening down the bolts they use chinesium and are easy to break. Here's Brent thread on installing a BBK it will come in handy. 49ccscoot.proboards.com/thread/556/install-big-bore-kit-1e40qmb Put scoot up on center stand. Remove carb from intake and ziptie to frame. Remove both cooling shroud halves. Spark Plug and Carb will have to be removed from engine to get the one side off. Have a drain pan ready. Disconnect your oil lines from the carb and oil tank these will go with the engine.(Recommend switching to premix and getting rid of the oil pump and tank) Disconnect cable from oil pump(Located on flywheel/stator side of engine by the cylinder) Unplug stator and starter connectors. Place 2x4 under rear wheel(If you're doing this alone) otherwise have helper hold rear wheel. Remove Lower Rear shock bolt. Remove nut for the engine mount. Have jack stands or something to hold the rear end of frame up ready. Hold onto the back of the frame while wiggling engine mount bolt out. BE READY THE FRAME WILL WANT TO ROLL AND FALL. Roll frame out of the way and use a jack stand to hold up the back half of frame. To install reverse removal procedure.
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Post by aeroxbud on May 14, 2021 16:23:25 GMT -5
It really isn't hard to remove these engines. As it's your first time doing a cylinder, I would remove the engine. Will make it a lot easier for you. If you go with a sports kit. You could keep the standard carb. I ran a Polini with the standard carb for a couple thousand miles. It lacked the top end of the bigger carb, but worked fine.
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Post by aeroxbud on May 14, 2021 16:27:41 GMT -5
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