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Post by alleyoop on Jun 7, 2014 13:13:00 GMT -6
I say to get a tach so you will probably find out that the RPMS are much lower on the problem child. Now it could be compression is lower on that one and not putting out. When you ran the Video it was obvious from the sound that one did not have the power. So yes to answer your question a rebuild of just the 47 will help a lot and get your compression plus a little more. As for getting the full deal that is up to you but if your just wanting to get it to run much better and have the power the 47 will do.
Alleyoop
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Post by crazedfox on Jun 10, 2014 9:59:47 GMT -6
Cool.
I've been thinking the same thing with the whole compression thing as well.
Rings might not have seated right, or just got an ill engine from the start.
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So do you agree that a 47mm bore kit won't need anything else with it.
I won't need to get a bigger main jet or something else?
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Sence the go-big or go-home set up would put a hurt on the wallet. lol.
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Post by alleyoop on Jun 10, 2014 12:23:07 GMT -6
Well a bigger main jet you should get after all now you have more displacement so it can take a little more fuel to produce more power. But check your current jet size first otherwise your shooting in the dark.
Alleyoop
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Post by crazedfox on Jun 10, 2014 12:28:58 GMT -6
Ok, will look into that.
What size Main-jet you recommend?
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Post by alleyoop on Jun 10, 2014 12:43:41 GMT -6
I think a 75 would do, the 18mm carbs usually have a main jet in the high 60 size like 69 or so.
Alleyoop
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Post by crazedfox on Jun 15, 2014 8:30:52 GMT -6
Wholly, friggin crap! Found my problem. I started by pulling the stock engine, & putting in a temp.
Found something of interest when swapping engines around. My iridium spark-plug had lost its needle like tip, leaving a rather large gap. I regapped it, & put it in the temp engine. The temp engine ran about as bad if maybe worse than the stock. (Smoked as if had ring seat issue.) So decided to put the stock back in. But this time I put a good stock spark-plug in my stock engine. & then I cut my exhaust down to 10" & put in a restrictor with a 7/16-hole about 1" long followed by a reexpansion to stock pipe size (3/4"-I.D.) about 3" long to act as a venturi on the exhaust. Exhaust is now around 12" long todal. -- Whew, what an improvement ! The darn thing runs around 36-38 MPH on the flats! 39-41 MPH with some back-wind.  --- Crazy, the exhaust was part of the problem the whole time, when I put my mouth to the exhaust/muffler intake & blew I felt some resistance. Now when I do this test on any other exhaust/muffler I can barely feel any resistance. So this is either how their slowing these scoots down, Or I got a bad muffler from the start. ---- Still looking to do the 47mm swap, & tune my exhaust a little more. Maybe get a long-pipe glass-pack made. _ |
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..BAD TO THE BONE..
