|
|
Post by motorhead on Jun 26, 2011 7:16:41 GMT -5
Pretty soon I will be getting my motorcycle licence here in Florida. I already have a 150cc Diamo Velux sitting in the garage waiting for me to take her out. I plan to ride her in the winter and on rainy days. I have never tuned a GY6 so I need some answers from the "49ccscoot braintrust."
1. What performs better, 2 valve 180cc or 4 valve 150cc?
-ie top speed, acceleration, fuel economy, longevity
2. Is there a 180cc 4 valve cylinder and piston?
3. does anyone really sell a 200cc kit or are sellers just rounding up from 180 like they do on QMB with so called 100cc kits?
|
|
|
|
Post by 90GTVert on Jun 26, 2011 10:19:23 GMT -5
Sorry, I haven't spent much time on the bigger GY6s.... 3)You have to get a stroker crank to make 200cc. A lot of the kits are nowhere near 200cc that claim to be. Stock GY6 150 [/color] 57.4mm x 57.8mm = 149.6cc Big Bore58.5mm x 57.8mm = 155.4cc 59mm x 57.8mm = 158cc 60mm x 57.8mm = 163.4cc 61mm x 57.8mm = 168.9cc 62mm x 57.8mm = 174.5cc 63mm x 57.8mm = 180.2cc +8.2mm Stroker Crank57.4mm x 66mm = 170.8cc 58.5mm x 66mm = 177.4cc 59mm x 66mm = 180.4cc 60mm x 66mm = 186.6cc 61mm x 66mm = 192.9cc 62mm x 66mm = 199.3cc 63mm x 66mm = 205.7cc [/center] There are more stroker cranks and maybe larger bores? out there, but again I dunno much about the GY6 150 aftermarket so I just did some figurin' for ya. ;D I know I saw some kits or whole engines up around 232cc or so when I looked some time ago. |
|
|
|
Post by lshigham on Jun 26, 2011 10:25:46 GMT -5
I know +4 and +2 stroker crank's exist too.
|
|
|
|
Post by 90GTVert on Jun 26, 2011 10:55:18 GMT -5
+3 as well. I just used the largest I know of to show what it really takes to be 200cc.
|
|
|
|
Post by lshigham on Jun 26, 2011 10:58:42 GMT -5
+3 as well. I just used the largest I know of to show what it really takes to be 200cc. Is there a +8.2mm crank available? Never seen one before. Most of the 200cc scoot's are actually 175's. |
|
|
|
Post by 90GTVert on Jun 26, 2011 11:07:16 GMT -5
|
|
|
|
Post by lshigham on Jun 26, 2011 11:47:17 GMT -5
For what it is, bargain. If they did stroker crank's for the 139QMB, imagine what fun (and expense!) you could have had.
|
|
|
|
Post by lshigham on Jun 26, 2011 11:49:09 GMT -5
|
|
|
|
Post by motorhead on Jun 26, 2011 13:33:02 GMT -5
Alright. Informative enough. So... As for the next question, 4 valve 150cc or 2 valve 180cc? which is better.
|
|
|
|
Post by lshigham on Jun 26, 2011 13:59:37 GMT -5
Alright. Informative enough. So... As for the next question, 4 valve 150cc or 2 valve 180cc? which is better. Do stock 4 valve configurations even exist? Haven't heard of them before. Got us a link? |
|
|
|
Post by motorhead on Jun 26, 2011 14:13:48 GMT -5
|
|
|
|
Post by lshigham on Jun 26, 2011 14:20:55 GMT -5
Ah, so it's not available on a stock scoot. I'd opt for the increased displacement TBH.
I know that in cars four valve's instead of two doesn't offer a significant performance gain, but lightens the valve's to reduce valve seat recession.
|
|
|
|
Post by 90GTVert on Jun 26, 2011 17:38:40 GMT -5
I agree that the displacement would probably offer more than the 4V. Never tried either though.
|
|
