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Post by magoconnor on Jan 28, 2018 23:45:09 GMT -5
Ok cool.
I'm going to change the head gasket (the cylinder head, will be the only thing I will be removing) Do I need to change the base gasket?
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Post by magoconnor on Jan 28, 2018 15:55:12 GMT -5
Hello.
Has anyone tried a C8HSA spark plug?
I usually go with C7HSA on my 139qmb 72cc. Will the change make any notable difference ?
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Post by magoconnor on Jan 28, 2018 15:46:37 GMT -5
Hello.
I have Port matched a 139qmb head and opened it up a little ( not to much).
Since i decided to grind/ lap the valves, I thought I might as well revisit the in/out ports.
I've been hearing good things about, going over the intake port with 40 grit sandpaper.
Has anyone tried it? Is there any other performance tricks out there?
The exhaust valve is clearly not sealing, the intake is a little better. I've bought some rough and fine grinding agent.
Both inner valves springs appears to be broken.
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Post by magoconnor on Jan 21, 2018 20:51:27 GMT -5
Hello. I bought a new set 12" tires of a used baotian. The bearings are bad, so I need to replace them. The problem is, I dont know which model the came from! So i'm not sure exactly what size i need.
I dont want to take the wheels of the bike, before i can get some new ones ( but maybe I have to)
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Post by magoconnor on Jan 21, 2018 20:20:36 GMT -5
Ok sounds good. But thanks alot, you have been very helpful.
Just out of curiosity, have you or somebody you may know seen any gains with a BVH ?
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Post by magoconnor on Jan 21, 2018 13:44:04 GMT -5
oh damn.. You never know with these chinese dealers.
I think the "big valve" head is the only upgrade I really need or at least the only mod I can do, without upsizing the bore diameter. What do you think? Any upgrades you can think of? My Setup 139qmb 72cc cylinder standard head Performance cam ( not a9! but still a good one) 21mm carb unifilter Performance exhaust Naraku 32000 v coil Bigger intake manifold polished Port matched intake/ exhaust Advanced the timing ( with your free mod) Performance variator and clutch Medium tension spring Removed all restrictions.
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Post by magoconnor on Jan 20, 2018 19:28:29 GMT -5
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Post by magoconnor on Jan 20, 2018 11:33:33 GMT -5
Hello again. the combustion chamber on most "big valve" heads are 50mm. I hope it will turn out for the better. do you think I will have any clearance issuses? my scooter is kymco agillity 139qmb 72cc
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Post by magoconnor on Jan 19, 2018 21:57:31 GMT -5
Hello. Thanks for the help, feel free to post more links ( if you find any) I'm thinking about maybe going with the first aliexpress link.
Do you think it will lower the combustion to much ? i will be runing it with a performance cam and a 21mm carb.
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Post by magoconnor on Jan 19, 2018 14:43:08 GMT -5
Hello. I'm looking for a big valve head for my 72cc 139qmb, but I'm having hard time finding one (especially in europe). I will appreciate all the help I can get.
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Post by magoconnor on Jan 8, 2018 20:41:09 GMT -5
Thanks man.
So I just run the green pin straight to the frame/ground ?
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Post by magoconnor on Jan 8, 2018 20:30:26 GMT -5
Anyone?
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Post by magoconnor on Jan 8, 2018 19:22:37 GMT -5
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Post by magoconnor on Dec 15, 2017 22:48:25 GMT -5
Anyone? Could really use some help.
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Post by magoconnor on Dec 6, 2017 18:11:25 GMT -5
Ok then.
Do you know where, you can purchase the "small type spring" in europe? Or maybe a brand that makes them?
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