Wow I don't believe I've never clicked on the tabs on the left. I'm such an idiot.
Check this out..
SUPER BORE CRANKCASE SET (186CC UNTIL 217CC)
The maximum displacement possible for MSX125 with the original crankshaft and genuine Honda crankcase is 180cc.
The Yuminashi R&D has developed a 150cc Light Bore kit to use with the original Cylinderhead and valves for MSX125, and a 160cc and 180cc Big Bore kit to install on the original, genuine Honda crankcases and crankshaft with the Yuminashi SX30 HEAD (30/24.5mm valves).
If you want more, then you will need these Yuminashi Super Bore crankcases who are prepared to accept the Yuminashi 210cc (68mm piston) Super Bore Cylinderkit to install on the original stroke MSX125 crankshaft.
The Yuminashi Super Bore Crankcases are not painted black as original, but unpainted aluminium and this for the simple reason to improve the cooling capacity from the engine.
The Yuminashi SPR-X HEAD for the 210cc Super Bore cylinder kit with 33/26.2mm valves is based on our racing experience with the Yuminashi SP200R factory engine.
The Super Bore Crankcases set for MSX125 includes:
1 x Left Crankcase
1 x Right Crankcase
1 x Crankcase Gasket Yuminashi
2 x Pin, Crankcase
YUMINASHI SX30 HEAD (150cc UNTIL 175CC)
The Yuminashi SX30 Head is specally developed to be used on engines with an displacement from 150cc (57,25mm) until 175cc (62mm).
The YUMINASHI SX30 HEAD has reinforced valve guides and special anti-magnetic stainless steel valves with titanium retainers and a 30mm intake valve with 24,5mm exhaust valve to be used with the eye on competition purposes.
The anti-magnetic stainless steel intake valve has a 4,5mm stem and the diameter from the anti-magnetic stainless steel exhaust stem is 5mm.
The YUMINASHI SX30 HEAD comes complete with titanium alloy retainers and double progressive valve springs which are a perfect combination to make the highest RPM's possible, and an absolute improvement compared with the genuine single MSX125 / GROM valve springs with steel retainers.
The YUMINASHI SX30 HEAD includes:
1 x Aluminum non painted cylinderhead to improve the cooling capacity
1 x 4.5mm Titanium valve retainer
1 x 5mm Titanium valve retainer
1 x 30mm special stainless steel anti-magnetic intake valve
1 x 24.5mm special stainless steel anti-magnetic exhaust valve
2 x Double progressive valve springs, reinforced
1 x 4.5mm Cotter valve set
1 x 5mm Cotter valve set
YUMINASHI SPR-X HEAD (180cc UNTIL 223CC)
The Yuminashi SPR-X Head is developed with our racing experience from the Limited Edition Yuminashi SP200R Factory engine, and is mentioned to be used on MSX125 / GROM engines from 180cc (63mm) until 223cc (70mm).
The SPR-X Head has reinforced valve guides and special stainless steel anti-magnetic valves, with a 33mm intake valve and 26,2mm exhaust valve.
The intake and exhaust valve has a 5mm stem and the head comes complete with 5mm titanium alloy retainers (3Gr.) and double progressive valve springs which are an absolute improvement compared with the genuine single MSX125 / GROM valve springs with steel retainers.
The YUMINASHI SPR-X HEAD includes:
1 x Aluminum non painted cylinderhead to improve the cooling capacity
2 x 5mm Titanium valve retainer
1 x 30mm special stainless steel anti-magnetic intake valve
1 x 24.5mm special stainless steel anti-magnetic exhaust valve
2 x Double progressive valve springs, reinforced
2 x 4.5mm Cotter valve set
PROGRESSIVE DOUBLE VALVE SPRING CONVERSION SET
This double valve spring conversion set is mentioned to convert the genuine, single valve spring MSX125 / GROM head in to a head with double progressive valve springs to avoid the floating valves.
If you start to tune your engine up for higher RPM's as standard, then the first issue to be solved will be the problem from the floating valves on the MSX125 / GROM.
This set includes 2 steel retainers mentioned for the genuine 5mm valve stem, and if you would like to have the racing version from this set, which is also available with 2 titanium retainers, then please look below...
The color on the valve springs is mentioned to give you a help to install them correctly. Because these valve springs are progressive valve springs you need to install them with the colored side up.
RACING PROGRESSIVE DOUBLE VALVE SPRING CONVERSION SET
The Racing double valve spring conversion set is not only mentioned to convert the genuine, single valve spring MSX125 / GROM head in to a head with double progressive valve springs, but to relief the valve train and squeeze the full potential out of your cylinderhead.
If you start to tune your engine up for higher RPM's as standard, then the first issue to be solved will be the problem from the floating valves on the MSX125 / GROM.
This set includes 2 titanium retainers from 3Gr. each, mentioned for the genuine 5mm valve stem...
The color on the valve springs is mentioned to give you a help to install them correctly. Because these valve springs are progressive valve springs you need to install them with the colored side up.
TITANIUM ALLOY 5MM/5MM RETAINER SET
Titanium alloy retainer set.
If you start to tune your engine up for higher RPM's as original, then the first issue to be solved on the MSX125 / GROM will be the problem from the floating valves.
This set can be installed on the genuine MSX125 cylinderhead to make some higher RPM's with the genuine single valve spring possible. This set includes 2 x 5mm retainers. The weight of 1 retainer is 3Gr…
TITANIUM ALLOY 4.5MM / 4.5MM RETAINER SET
This set comes standard in the Yuminashi SX30 & SPR-X Head and can not be installed in the genuine 125cc cylinderhead.
Set includes 2 x 4,5mm retainers. The weight of 1 retainer is 3Gr…
● Titanium alloy retainer set for a combination of a 4.5 and 5mm valve stem. This set can not be installed on the genuine MSX125 cylinderhead and is a replacement part for the YUMINASHI SX30 HEAD.
This set includes 1 x 4.5 and 1 x 5mm titanium alloy retainers mentioned for a 4.5mm and 5mm valve stem. The weight of each retainer is 3Gr…
If you start to tune your engine up for higher RPM's as original, then the first issue to be solved on the MSX125 / GROM will be the problem from the floating valves.
This titanium alloy retainer set comes standard with the big valve YUMINASHI SX30 Head for MSX125 / GROM.
**YUMINASHI SX30 HEAD has one titanium alloy retainer 4.5mm, and one titanium alloy retainer with 5mm...