[chye]

lucky for us americans the GROM has been available in Thailand for some time now and there are already shops making parts for it.

Rumors of a 150cc and 200cc bore kit and tuning options.

A few shops worth following
https://www.facebook.com/pages/Sex-Machine-Racing-猿友有限公司/179929155396413

http://www.msxthai.com/board/index.php?topic=240.0

 

[chye]

BORE KIT 150/160/180/200CC for Honda GROM / MSX125

BORE KIT 150/160/180/200CC for Honda GROM / MSX125

The 57,25MM 150cc Light Bore kit is the Yuminashi starter set to tune up the MSX125 / GROM.
This cylinderset is developed in a multi-functional way because even if it's a light bore kit, it gives you a lot of possibilities later on.
As you can expect, the piston from the 150cc light bore kit is made to work in combination with the genuine 125cc head and valves and can be used in combination with the genuine single sensor MSX125 / GROM 25mm PGM-FI throttle body.
What you don't expect is that the piston is also able to be installed on the big valve Yuminashi SX30 Head with 30/24,5mm valves...
An other great feature from this kit is that you have the possibility to bore the 150cc light bore cylinder up to 160cc and even 180cc. You only need to buy the appropriate big bore piston set for the displacement you want and you can bore up your Light bore Kit to the displacement of your choise, you don't need to buy an other cylinder for that.
Please keep in mind if you bore the cylinder up, that you can't use the genuine 125cc cylinderhead anymore but need to install the Yuminashi SX30 Head.
The 150cc Light Bore cylinder comes in the original black color, and this is the only cylinder available in the Yuminashi assortment that comes in this color. All Yuminashi larger displacement cylinders come in an unpainted aluminum version to improve the cooling capacity.

The MSX/GROM 150CC LIGHT BORE KIT includes:

• 1 x 57.25mm Aluminum cylinder
• 1 x 57.25mm Light Bore Piston
• 1 x 57.25mm Piston ring set
• 1 x Piston pin (13mm)
• 2 x Piston clip
• 1 x 57.25mm special Copper Head gasket
• 1 x Cylinder base gasket

PRODUCT CODE: 12103-K26-572A

PRICE: 8.224THB (221.00€) Exclusive V.A.T.

​

BIG BORE KIT 160CC
░ FOR HONDA MSX125 / HONDA GROM (USA)



● The Yuminashi Big Bore Series are mentioned to be used in combination with the genuine MSX125 / GROM crankshaft and crankcases.
The limit for competition is in many countries 160cc, so the Yuminashi R&D has made this 59,25mm kit with 159,56cc to meet the rules about he maximum displacement.
The 160cc Big Bore kit can't be installed in combination with the genuine cylinderhead, but need to be installed with the Yuminashi SX30 Head which has special 30/24,5mm stainless anti magnetic valves and titanium alloy retainers with double progressive and reinforced valve springs.
The Big Bore kit comes in a non painted aluminium version to improve the cooling capacity from the cylinder and can be bored up until 180cc.

The MSX/GROM 160CC BIG BORE KIT includes:

• 1 x 59.25mm Aluminum cylinder
• 1 x 59.25mm Light Bore Piston
• 1 x 59.25mm Piston ring set
• 1 x Piston pin (13mm)
• 2 x Piston clip
• 1 x 59.25mm special Copper Head gasket
• 1 x Cylinder base gasket

PRODUCT CODE: 12103-K26-972B

PRICE: 8.344THB (225.00€) Exclusive V.A.T.

​

BIG BORE KIT 180CC
░ FOR HONDA MSX125 / HONDA GROM (USA)




● The Yuminashi Big Bore Series are mentioned to be plug & play in combination with the genuine MSX125 / GROM crankshaft and crankcases.
This 63mm bore kit is with 180cc the largest displacement possible to be installed on the genuine MSX125 / GROM crankcases without modification.
The 180cc Big Bore kit can't be installed in combination with the genuine cylinderhead, and need to be installed with the Yuminashi SPR-X Head which has special 33/26,2mm stainless anti magnetic valves and titanium alloy retainers with double progressive and reinforced valve springs.
The 180cc Big Bore kit comes in a non painted aluminium version to improve the cooling capacity from the cylinder.

The MSX/GROM 180CC BIG BORE KIT includes:

• 1 x 63mm Aluminum cylinder
• 1 x 63mm Light Bore Piston
• 1 x 63mm Piston ring set
• 1 x Piston pin (13mm)
• 2 x Piston clip
• 1 x 63mm special Copper Head gasket
• 1 x Cylinder base gasket

PRODUCT CODE: 12103-K26-630B
PRICE: 9.304THB (250.00€) Exclusive V.A.T.

SUPER BORE KIT 200CC
░ FOR HONDA MSX125 / HONDA GROM (USA)




The Yuminashi 200cc Super Bore Kit is based on our racing experience with the very powerfull and exclusive Yuminashi SP200R factory engine.
If this limited edition engine slipped true your fingers back then, then you have the chanse now to buy the powerpack from the Yuminashi SP200R engine with the 200cc Super Bore Kit for MSX125 / GROM in combination with the big valve SPR-X Head (33/26,2mm valves).
Keep in mind that the Yuminashi Super Bore Kit's are mentioned to be installed on the Yuminashi Super Bore crankcases. These crankcases are available for MSX125 / GROM in a electro starter version and a kick starter version.
You can also bore your genuine crankcases up, but to make things less complicated Yuminashi have added the plug&play ready Super Bore Crankcases set to the assortment which comes in an aluminium, non painted version to improve the cooling capacity and to make it easy for you to install all Super Bore Series cylinder kit's.

The MSX/GROM 200CC BIG BORE KIT includes:

• 1 x 66mm Aluminum cylinder (Non painted aluminum to improve the cooling capacity)
• 1 x 66mm Light Bore Piston
• 1 x 66mm Piston ring set
• 1 x Piston pin (13mm)
• 2 x Piston clip
• 1 x 66mm special Copper Head gasket
• 1 x Cylinder base gasket

PRODUCT CODE: 12103-K26-660B
PRICE: 9.304THB (250.00€) Exclusive V.A.T.

 

[REDLINE]

150cc and 200cc bore kits would be awesome, the 9BHP it comes with isn't impressive in my opinion and of course anything more would be great such as these bore kits. How much more power can we expect to get with 150cc and 200cc bore kits?

 

[supermoto]

This is great news. This kit would be an essential purchase for me. It nearly doubles the current output on the stock Grom. I didn't see any prices on the links you posted. How much would it cost for 200cc kit?

 

[HondaNation]

I feel the Grom will be one the most customizable bikes on the market. At such a low cost, I don't think people will be worried about breaking warranty.

 

[chye]

Still have to figure out the tuning though.. That is something I'm trying to research but I need to learn some THAI first.

 

[Bama Dave]

Great!

I can't believe my eyes that they are already on the bandwagon to make the MSX125 faster. What is more surprising is they are selling these as kits that can be bought for the Grom which isn't even released yet.

usually you would have remove the engine and bring it to a machine shop to have them mill or bore it. The aftermarket support is all there for the Grom.

 

[AristoK.]

Still have to figure out the tuning though.. That is something I'm trying to research but I need to learn some THAI first.

i don't think we have to worry about that I am sure there will be a piggy back or tune box for this specifically. It's amazing with all these performance upgrades that is available for the Grom/MSX125. A little overwhelming right now but when i get the Grom I would be sure to look in to all these.

 

[MikeP]

i don't think we have to worry about that I am sure there will be a piggy back or tune box for this specifically. It's amazing with all these performance upgrades that is available for the Grom/MSX125. A little overwhelming right now but when i get the Grom I would be sure to look in to all these.

problem is, that Thailand is the biggest MSX125(Grom) market out their, and depending on how U.S. Grom sales go we can either see a lot of aftermarket support or very little. So a tune box may or may not be easily attainable

 

[WildBoy]

The 150cc Light Bore cylinder comes in the original black color,

Upped performance while retaining the overall OEM look sounds good to me, never liked it when aftermarket parts looked obvious that they were aftermarket. At this this way it will suit the masses and anyone else can look into getting it custom painted.

 

[chye]

bump for more info on the GROM bore kits~!

 

[GregW]

Awesome. Can't wait