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Post by gy6fandan on Jul 14, 2014 14:31:28 GMT -5
If I install a "Big Port Valve Head" for an upgrade on my gy6150 (stock cylinder - NO bbk) would I need a bigger tailpipe to run to the muffler ? I ordered a performance muffler but haven't really planned for the tailpipe.... because I do not know if I need a bigger tail pipe. Do I  |
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Post by UniqueSP on Jul 14, 2014 16:36:33 GMT -5
They really dont make a bigger (Wider) tailpipe. All you really need is a free flow exhaust system. Which you say you already have.if your upgrading your valve head you might as well upgrade the cylinder kit as well to at least a 60mm or 61mm Kit that requires no boring.
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Post by gy6fandan on Jul 14, 2014 16:50:17 GMT -5
UniqueSP --> Thanks for the info.
I thought about a BBK....... And thought about it. "Money" :oended my thinking which is a drag given all the work it takes to remove / put everything back on.
I just hope the 8 parts I ordered today correct power / performance issues, ya know.
The exhaust I ordered stated "high performance". it looked like a free flow from the pics.
I will write a review on the items I ordered (ebay, scooterelements, etc) once received / inspected / installed.... which might be 10 - 14 days or so.
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Post by rockynv on Jul 14, 2014 23:07:19 GMT -5
You really need to consider the entire system including the intake and carb. Some bikes come with a minimal carb that may not allow you to get the full benefit of a head with bigger ports. No point in a big valve or multi-valve head and free flow exhaust if the intake, bore of the carb, jetting and possibly the tuned port of the air filter housing doesn't support it. The length of the tube and tuning of the port has to match the pulse from the stroke of the engine to get a balance of low end torque and high speed performance. With a carb you are balancing air flow and maintaining enough vacuum to draw and atomize the fuel which the CV/Slide style carb also helps with.
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Post by gy6fandan on Jul 15, 2014 7:58:26 GMT -5
Money -  Items I purchase for the upgrade include: 1.) big port cylinder head 2.) valve cover (my old one was EGR / P.A.I.R) 3.) A9 Camshaft 4.) Performance intake 30mm 5.) high flow exhaust This cost a bit of money ! Sometime back I got a 26mm cab with the pumper on it - plan on up-jetting that. Also, I have changed the final gears, performance coil / CDI and changed the air filter to uni style. Cylinder head temperature gauge helps me monitor / gauge the air - fuel mix..... temps average 260 - 300 deg pending ambient temp and cruising speed. I don't race - I just want a smooth running / cool temperature / top speed that keeps up well with traffic / and good pep when accelerating.... can't find "CERAMIC" rear "shoes"..... have new CERAMIC front pads though. Going faster is a bad idea ...... Unless you can stop faster.  |
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Post by shalomdawg on Jul 15, 2014 11:31:12 GMT -5
howdy and good luck with all the up-grades. i would mention that the temps you measure are good to know BUT you need to be aware of where you are measuring as that will make incredible difference as to the reading.
lotsa miles and smiles to ya
ken
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Post by UniqueSP on Jul 15, 2014 11:32:33 GMT -5
The best brake pads in my opinion are the EBC Brake pads. Also depending on what type of scooter you have. Your front caliper might be 1 or two pistons. If your one piston then find a front double piston caliper. (Most are for the rear and wont mount correctly to the front) Also Rockynv is correct in his statement.
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