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Post by skoda90 on Oct 22, 2015 5:47:47 GMT -5
Hi,sry on bad english! Here is a stock:  After 19k+ km stock engine i upgrade a 47mm with new crankshaft and some styling!!               Now is setup: Carb 19mm 88#jet A9 cam 47mm Stock head mallosi multivar (minarelli) mallosi white spring (minarelli) blue 3 springs .... That setup now have 10k+km Im buy (waiting shipping) 47mm head with big valves and then i will put this piston i think compresion be ok?   |
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Post by katastroff on Oct 22, 2015 6:33:37 GMT -5
That's a pretty impressive engine rebuild. Yes you should have good compression with a new piston.  |
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Post by 90GTVert on Oct 22, 2015 8:28:48 GMT -5
Thanks for the pics, but please do not use imagebam again to host pictures. There are explicit pics and video ads when the larger versions are viewed so I had to edit your post to get rid of the links to the larger images. Here are easy ways to host pics on different hosts : 49ccscoot.proboards.com/post/7984The scoot looks much better with the black wheels and white letter tires. |
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Post by skoda90 on Nov 4, 2015 13:31:01 GMT -5
Ok no problem for the pics next time!
Has anyone put the carburetor of 150cc in such a setup?
I think about buyng 24mm carb for 125/150?
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Post by spaz12 on Nov 4, 2015 15:06:00 GMT -5
Ok no problem for the pics next time! Has anyone put the carburetor of 150cc in such a setup? I think about buyng 24mm carb for 125/150? You just have to use the 150 intake manifold with it. They work pretty good when set up correctly. You should have a free flow exhaust as well. |
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Post by skoda90 on Nov 4, 2015 16:58:17 GMT -5
I hope so,yes ofcorse but intake is 22mm like a port on head...
but is that carb not too big for 72cc?
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Post by skoda90 on Nov 10, 2015 15:18:50 GMT -5
Head with big valve was shipped to me. Now i waiting for gaskets! Piston are ready and waiting...     |
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Post by skoda90 on Nov 11, 2015 13:09:02 GMT -5
Today everything is included, but I lost the strength around 20-30%
Any idea why?
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Post by 90GTVert on Nov 11, 2015 14:28:25 GMT -5
So you're saying you've installed the kit and it's slower now? I'd guess the new head drops compression enough that the benefit of the valves is overshadowed by the lack of compression. If you had compression test numbers before and after, that would tell you.
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Post by skoda90 on Nov 11, 2015 16:06:08 GMT -5
Yep,new head 47mm with big valves and piston for higher compresion if you understand me? Here is example for pistons:  |
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Post by 90GTVert on Nov 11, 2015 16:39:59 GMT -5
I see. The old piston was dished and the new one has a domed crown. It would still be nice to know what the cranking compression is.
Have you tried re-jetting?
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Post by skoda90 on Nov 11, 2015 18:32:41 GMT -5
Now is 88 jet only have 90bigger,i will try tomorow,and waiting shipping for 125cc carb (90>100) jets
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Post by skoda90 on Nov 18, 2015 19:51:57 GMT -5
Problem of low power is low compression.
I waiting for 24mm carb and then we will see...
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Post by 90GTVert on Nov 18, 2015 21:30:05 GMT -5
IF you have low compression you'll need to figure out why before you get into carb swapping and tuning. You can take the carb off and do a compression test if you wanna see what that changes.
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