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Discussion Starter #1
I am going to do a BBK for my buddy's Monkey. Here is the parts list. Anyone have suggestions of anything we are missing? Any important mods to make the set more reliable? Thanks!


  • Koso 170cc bottom end and Koso 4 valve top end
  • Koso 34mm Throttle body
  • Drow Sports Oil cooler
  • Takegawa high flow oil pump
  • Drow Sports Heavy duty clutch plate
  • Upgraded clutch springs
  • Koso Timing chain tensioner
  • Koso 10-hole Fuel injector
  • Koso Injector adapter
  • Correct NGK spark plug for 4 valve head
  • Kitaco clutch cover
  • 16t front sprocket
  • Takegawa crankshaft support 4th bearing
  • Gromfatherz Crankcase breather
  • aRacer RCMini5 ECU
  • Proper Dyno Tune

Anything else that we really ought to add? Thanks!




(Posted in Grom forum because there seems to be a lot more action here)
 

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I am going to do a BBK for my buddy's Monkey. Here is the parts list. Anyone have suggestions of anything we are missing? Any important mods to make the set more reliable? Thanks!


  • Koso 170cc bottom end and Koso 4 valve top end
  • Koso 34mm Throttle body
  • Drow Sports Oil cooler
  • Takegawa high flow oil pump
  • Drow Sports Heavy duty clutch plate
  • Upgraded clutch springs
  • Koso Timing chain tensioner
  • Koso 10-hole Fuel injector
  • Koso Injector adapter
  • Correct NGK spark plug for 4 valve head
  • Kitaco clutch cover
  • 16t front sprocket
  • Takegawa crankshaft support 4th bearing
  • Gromfatherz Crankcase breather
  • aRacer RCMini5 ECU
  • Proper Dyno Tune

Anything else that we really ought to add? Thanks!




(Posted in Grom forum because there seems to be a lot more action here)
You may need an intake (I'm not familiar with the Monkey) and be sure to get the brass screw for the KOSO Throttle Body.
 

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Discussion Starter #3
You may need an intake (I'm not familiar with the Monkey) and be sure to get the brass screw for the KOSO Throttle Body.
Forgot to mention, also has a Yoshimura full exhaust and MNNTHBX intake.

The brass screw is a good call. Thanks
 

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Your list looks good

Port that head, send it to Kenny "GromFatherZ, at the same time do a complete port and polish of the koso throttle body and inlet tube.

Speed spacer, GromFatherZ has them.

have the head port match for both the intake port and the exhaust port matched with the I/D exhaust that you use.
 

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I'd skip the strange and expensive Koso injector / adapter contraption and go with a 10 hole Forza 300 injector. Reference 16450-MGC-D21. It's plug & play.

Also I'd really consider a Kitaco crank, you might get away with the stock crank and limited RPM but that kind of defeats the 4 valve purpose.
 

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Discussion Starter #6
I'd skip the strange and expensive Koso injector / adapter contraption and go with a 10 hole Forza 300 injector. Reference 16450-MGC-D21. It's plug & play.

Also I'd really consider a Kitaco crank, you might get away with the stock crank and limited RPM but that kind of defeats the 4 valve purpose.
Thanks for that injector tip. That expensive Kosi injector has been bugging me. I just figured the PCX 150 was probably inadequate.

Definitely debating the crank. I’ll give it some consideration.

Thanks!
 

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I am going to do a BBK for my buddy's Monkey. Here is the parts list. Anyone have suggestions of anything we are missing? Any important mods to make the set more reliable? Thanks!


  • Koso 170cc bottom end and Koso 4 valve top end
  • Koso 34mm Throttle body
  • Drow Sports Oil cooler
  • Takegawa high flow oil pump
  • Drow Sports Heavy duty clutch plate
  • Upgraded clutch springs
  • Koso Timing chain tensioner
  • Koso 10-hole Fuel injector
  • Koso Injector adapter
  • Correct NGK spark plug for 4 valve head
  • Kitaco clutch cover
  • 16t front sprocket
  • Takegawa crankshaft support 4th bearing
  • Gromfatherz Crankcase breather
  • aRacer RCMini5 ECU
  • Proper Dyno Tune

Anything else that we really ought to add? Thanks!




(Posted in Grom forum because there seems to be a lot more action here)

What’s the total price (approximately) for all those parts?
 
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