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Post by Enviromoto on Nov 13, 2011 16:05:31 GMT -5
School me:
I show a 187 Exhaust Duration and 165 Transfer Duration.
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Post by Enviromoto on Nov 13, 2011 16:12:17 GMT -5
I must be doing something wrong.
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Post by Enviromoto on Nov 13, 2011 16:51:42 GMT -5
Used the wrong Degree wheel.
With the 49ccScoot Degree wheel I have
190 Exhaust
132 Transfer
From what I understand that will put me in the 10k category. Little higher than I like with my ZX exhaust but unless anyone here tells me otherwise I'm buttoning it up and moving on to the next phase of the build.
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Post by 90GTVert on Nov 13, 2011 17:36:02 GMT -5
Yeah, that's gonna be happy with a peak around 10,000RPM most likely. I see you have 2mm written on the port map. Is that a spacer? If so, shave that down a hair and you will drop the timing.
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Post by 190mech on Nov 13, 2011 17:39:43 GMT -5
If you triple checked those numbers,I'd do it again with no base gasket and see what you get.Dont know what kind of jug you have there,but those durations are getting into the road race area.As Robert said,get the durations right,then set up the squish..We ran low pipes in the 70's on MX courses and would dent heck out of them,any ideas on this??
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Post by Enviromoto on Nov 13, 2011 17:41:45 GMT -5
Yeah, that's gonna be happy with a peak around 10,000RPM most likely. I see you have 2mm written on the port map. Is that a spacer? If so, shave that down a hair and you will drop the timing. That 2mm was something I should have erased it was nothing to do with this. No spacer or anything just a single base gasket. |
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Post by Enviromoto on Nov 13, 2011 17:44:01 GMT -5
If you triple checked those numbers,I'd do it again with no base gasket and see what you get.Dont know what kind of jug you have there,but those durations are getting into the road race area.As Robert said,get the durations right,then set up the squish..We ran low pipes in the 70's on MX courses and would dent heck out of them,any ideas on this?? Yep triple checked everything, and its some kit autotech sells. I got this motor off of a race friend of mine that had some family issues and had to sell it off. No name brand on the box or the cylinder. Not sure what to do about the exhaust hanging down, maybe a skid plate of some sorts? For the record this is mostly for show/pitbike use |
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Post by 90GTVert on Nov 13, 2011 17:53:03 GMT -5
If those numbers drop a couple of degrees you can seal the cylinder with the same stuff you seal the cases with.
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Post by Enviromoto on Nov 13, 2011 19:14:12 GMT -5
182
124
Correction after triple checking I would say it's actually much more like 182 exhaust 124 transfer.
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Post by 90GTVert on Nov 13, 2011 20:12:01 GMT -5
A base gasket right between there would probably be about right for my taste but I'd stick with that rather than the durations w/this gasket since you want to keep more low end. The ZX should still work well with that.
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Post by 190mech on Nov 14, 2011 5:34:48 GMT -5
Now that looks better!You'll want to run a bigger carb to keep the engine cooler,around 22 to 26mm..
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Post by Enviromoto on Nov 14, 2011 8:39:48 GMT -5
Cool, I have a 26 oko (maybe a 28 not sure) thats going on it.
Thanks for the help guys, hope to have this done by the weekend.
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Post by Enviromoto on Nov 14, 2011 10:20:10 GMT -5
Thinking about just throwing somr knobbies on and rolling the original front end like these guys do for now.  Until I find the pitbike I want cheap enough. |
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Post by 2strokd on Nov 14, 2011 11:04:45 GMT -5
Cool, itle work  ! Im thinking, "man, that shit looks badass! I bet i could kick it on a mild stroker and do well" |
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Post by Enviromoto on Nov 14, 2011 11:33:15 GMT -5
Hell yea Robert, need to find a scooter friendly track that's not as aggressive as Haspin.
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!