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Post by Thebatman on Dec 26, 2011 8:25:29 GMT -5
Good morning to you... I'm trying not to bother ppl with these issues i have but i do have a new question.. I am putting the engine together finally and in the process of doing a leak down test..(i got me a "real" leak down tester in the mail the other day. ;D) Of course, i have a tiny leak in these "ct" intake manifold at the case.. (these have proven a worry with leaks). Anyway, when i got her together and installed a plug(for the test) and rotated the crank, MAN, she gets hard to turn. I thought it may be me, so i removed the plug to see and she rotates alot better....On a "baby stroker", is it normal to be hard to rotate fully assembled? That much more compression maybe? It will rotate assembled but it's alot harder to rotate. I do hope that's all it is, just more compression in the engine now.... Thank you for any advice or input on this
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Post by reveeen on Dec 26, 2011 9:04:56 GMT -5
Did you measure your assembled squish? (with 50/50 solder)
Remembering: increased bore, maintaining the same combustion chamber size = increased compression.
Personally: I would use a compression gauge to measure the lbs/square inch in my combustion chamber..... *thinking* about 160psi should be good (at good strong kick over).
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Post by Thebatman on Dec 26, 2011 11:24:58 GMT -5
Did you measure your assembled squish? (with 50/50 solder) Remembering: increased bore, maintaining the same combustion chamber size = increased compression. Personally: I would use a compression gauge to measure the lbs/square inch in my combustion chamber..... *thinking* about 160psi should be good (at good strong kick over). Hey man, thanks for a reply.. Yeah, i checked the squish and i have a good .9mm Maybe the stroker crank, 50mm bore is the culprit..
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Post by 90GTVert on Dec 26, 2011 12:17:53 GMT -5
I agree with what reveeen is saying. Probably pretty high compression, especially with .9mm squish.
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Post by reveeen on Dec 26, 2011 13:12:23 GMT -5
These are "old school" type motors, I'm not sure pressure in excess of 160psi is a real good idea. If you notice, your replacement head has the spark plug hole re-located, in an attempt to cool things down.
Raising your exhaust port in the cylinder (increasing the exhaust duration) will drop the compression a bit.
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Post by Thebatman on Jan 3, 2012 7:29:29 GMT -5
Hello all.. I have been trying for 2 weerks to get a good seal at the intake on this fkr. Yeah, a roll of gasket material has been used, A tube of rvt has been used and this fkn thing is STILL leaking. I cant seem to pass a test.(will lose 1-1/2psi in 10 min ATM) DOES ANYBODY HAVE A FIX FOR THIS SHORT OF USING THE GOOD OL EXPOXY GLUE. Which may be my next choice
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Post by reveeen on Jan 3, 2012 9:01:47 GMT -5
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Post by Thebatman on Jan 3, 2012 9:22:06 GMT -5
Hello reveen, I have got to disagree with you on the "non-hardening" stuff.. I happen to have a tube of the same stuff and it absolutely made a mess INSIDE the engine the 1st build i done on this zx. It doesn't harden and gets sucked right into the engine... Also, i'm not quite following you when you say this is a "old school" motor.. It's a 2004 model..(stopped in '07?) A honda dio clone. BEcause it's not a mina, it's "old school"?
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Post by 90GTVert on Jan 3, 2012 9:46:15 GMT -5
I use ThreeBond when the intake gives me trouble. Same stuff I use for sealing the cases together. It seals, but it is a bitch to get the intake back off.
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Post by reveeen on Jan 3, 2012 16:01:30 GMT -5
Honda designed (and made) that motor in the early 70's, considering it is 2012, they have been at that for 40+ years.
On sealing surfaces that tend to move, being the nature of different densities of aluminum (be it different alloys, or different case thicknesses) you get the best sealing with a paper gasket and a very thin layer of non hardening sealer. RTV has no place inside a motorcycle engine.... if you have to use RTV you are doing something wrong.
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vvtr
Scoot Enthusiast
Posts: 243
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Post by vvtr on Jan 3, 2012 18:12:45 GMT -5
Yeh non hardening blue hylomar for me. I wont use anything else. If its good enough for rolls royce, military and racers its good enough for me!
Just a light smear thougu and not a bead. I have seen it block oilways whenapplied as a bead, with disastrous results!
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werewolf197443
Scoot Member
plus need help identifying my zuma engine. the case is stamped AF129E-407347
Posts: 27
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Post by werewolf197443 on Mar 5, 2021 22:42:47 GMT -5
So super 9 wheels are a direct fit?
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werewolf197443
Scoot Member
plus need help identifying my zuma engine. the case is stamped AF129E-407347
Posts: 27
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Post by werewolf197443 on Mar 26, 2021 9:50:00 GMT -5
Does anyone know the stock secondary gear size in the zx50
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