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| 150cc GY6 and Under Engine Tech GY6 and Smaller Technical Discussion Forum |
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#1
11-12-2013, 08:32 AM
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4 valve head questions
Hi,
I'm curious, if you put on a BBK, can you still use the 4 valve head from a standard sized cylinder? Also, i see some back and forth on the internets about wheather you need a piston machined to allow for the valves. Input?
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2013 Trailmaster XRX 150 Type 86 stroker Taida 4V head with 23/22mm valves, forged 4V piston,Taida 62mm jug,forged Taida 8200 KDU stroker crank, Koso high-flow oil pump, Taida case half w/ oil cooler ports, Setrab oil cooler,TrailTec Vapor, Mikuni VM26-606, aluminum 30mm intake, Uni filter, aluminum stack, Hammerhead racing exhaust, MotoRio adjustable CDI/HO Coil, Iridium plug, Full Dr Pulley CVT kit w/ 16g sliders, JD's Mikuni slide kit 2014 Kandi 90B 
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#2
11-12-2013, 11:10 AM
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I have used the 4 valve head with the 2 valve piston but you will need to check valve to piston clearance since many BBK's use a slight domed piston. If you go with a 4 valve head only get the Taiwanese head. The cheap Chinese heads aren't worth a darn. The company who made the Chinese heads are out of the business and 90% of what you find do not oil properly, so maybe 2 years and you will be buying another complete head since you cannot find valves, can, or rockers for those heads.
Last edited by SYCARMS; 11-12-2013 at 11:11 AM. Reason: add content
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#3
11-12-2013, 11:21 AM
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are Rumia and Hoca Taiwanese companies?
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2013 Trailmaster XRX 150 Type 86 stroker Taida 4V head with 23/22mm valves, forged 4V piston,Taida 62mm jug,forged Taida 8200 KDU stroker crank, Koso high-flow oil pump, Taida case half w/ oil cooler ports, Setrab oil cooler,TrailTec Vapor, Mikuni VM26-606, aluminum 30mm intake, Uni filter, aluminum stack, Hammerhead racing exhaust, MotoRio adjustable CDI/HO Coil, Iridium plug, Full Dr Pulley CVT kit w/ 16g sliders, JD's Mikuni slide kit 2014 Kandi 90B
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#4
11-12-2013, 11:56 AM
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I'm not really sure since I have not in the past used either of those 4 valve heads. I have not stocked them in a while for they just don't move fast enough and when I purchase them I have to purchase at least 10. I'll order from one of 3 known Taiwanese exporters. Most of what Taiwan sells is made in China just like here but the difference is the Taiwanese develop their own product and have an excellent quality control.
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#6
11-12-2013, 06:49 PM
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I have. They're machined a bit more to make room.
http://www.scootercatalog.com/hoca-g...tm_content=pla
__________________
2013 Trailmaster XRX 150 Type 86 stroker Taida 4V head with 23/22mm valves, forged 4V piston,Taida 62mm jug,forged Taida 8200 KDU stroker crank, Koso high-flow oil pump, Taida case half w/ oil cooler ports, Setrab oil cooler,TrailTec Vapor, Mikuni VM26-606, aluminum 30mm intake, Uni filter, aluminum stack, Hammerhead racing exhaust, MotoRio adjustable CDI/HO Coil, Iridium plug, Full Dr Pulley CVT kit w/ 16g sliders, JD's Mikuni slide kit 2014 Kandi 90B
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