Big bore for Ice Bear?

[kevino]

Where can I order a big bore kit for my 49cc Ice Bear?  

[jstich]

I have used parts for scooters with no problems.There are other reputable shops out there too.You could go the amazon/e bay route but that's a bigger risk.

[Deleted]

Partsforscooters is great. Very good folks and prices reasonable.

I also like scooterworks, scootertuning.ca, get2it.

Have also used scooterpartsco, racingplanetusa, gy6store, dynoscooter, and scooterpartshop without issues.



With bore kits or essential parts, I would go with a reputable scooter parts specialist such as those above rather than Amazon, but that's just me.

[kevino]

GY6 Cylinder Rebuild Kits Trkimal 100cc Big Bore Kit for 64mm Valve 49CC 50CC 139QMB Moped Scooter Engine 50mm Bore Upgrad...
GY6 Cylinder Rebuild Kits Trkimal 100cc Big Bore Kit for 64mm Valve 49CC 50CC 139QMB Moped Scooter Engine 50mm Bore Upgrade Set with 6pin Racing CDI Ignition Coil Performance Spark Plug Clutch Spring
4.1 out of 5 stars 103

I found this for $79. How does gy6 differ from qmb?

[dan50]

A lot of people call 139QMB a GY6 generically.

If you're going the bigger BBK, make sure you put in a good aftermarket crankshaft. A stock crank can handle a 47mm BBK, but not the power of the bigger BBK kits.

[scooter7878]

I use ncy store there shipping is fast they have a lot of parts and customer service is good. Racing planet is good also but takes a little longer to get the parts. as for brands I prefer naraku and ssp-g but hoca and ncy are also good taida is good too but I find no one has a lot of stock in them

[fugaziiv]

Jun 18, 2021 5:50:47 GMT -5 scooter7878 said:

I use ncy store there shipping is fast they have a lot of parts and customer service is good. Racing planet is good also but takes a little longer to get the parts. as for brands I prefer naraku and ssp-g but hoca and ncy are also good taida is good too but I find no one has a lot of stock in them

Food for thought, HOCA is now SSP-G. It was rebranded a few years back after HOCA closed. You can still find some HOCA branded product, but everything HOCA is moving or has moved to the SSP-G brand.


Matt

[Deleted]

+1 on SSP-G. Am running their 54mm cylinder on my 103. I also have their throttle cable and variator the Yamati. Very happy with quality of the parts.

fugaziiv Thanks for the info on that. I noticed that as Hoca was disappearing SSP-G was showing up with a lot of the same part numbers. Nice to have confirmation.

[fugaziiv]

Jun 18, 2021 16:47:42 GMT -5 rtnifty said:

+1 on SSP-G. Am running their 54mm cylinder on my 103. I also have their throttle cable and variator the Yamati. Very happy with quality of the parts.

fugaziiv Thanks for the info on that. I noticed that as Hoca was disappearing SSP-G was showing up with a lot of the same part numbers. Nice to have confirmation.

I was HOCA's sole US importer, and we own SSP-G... so straight from the horse's mouth I guess.


Matt

[kevino]

Thanks for moving me to this forum. What's the largest BBK I can get without machining the cases? I get Amazon ads for 100cc BBBKs. Should the BBK be matched to a larger venturi carb?

TIA,

kevino

[steve1297]

Jun 29, 2021 10:03:34 GMT -5 kevino said:

Thanks for moving me to this forum. What's the largest BBK I can get without machining the cases? I get Amazon ads for 100cc BBBKs. Should the BBK be matched to a larger venturi carb?

TIA,

kevino

52.4mm is the largest. And if you get a head with bigger valves, you can run a 24mm CVK carb for 150cc scoots, or even better, a 21 or 24mm OKO flat side carb, or Mikuni carburetor. You need a different throttle cable for the OKO or Mikuni, bit it's worth it