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Post by sailracer on Aug 11, 2013 10:05:49 GMT -5
yeah, thats what i'm afraid of, with 1 base gasket though, I think compression will be over220 psi, no good
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Post by sailracer on Aug 11, 2013 9:47:58 GMT -5
I had planned on installing a new hoca piston in a scrappydog BBK & head. I was going to do a compression test with both 1 and 2 base gaskets, but i'm pretty sure 1 gasket would yeild too much. I am going to install the two bases. Can I also use 2 head gaskets without a problem? or should I just use the 1?
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Post by sailracer on Aug 10, 2013 15:47:35 GMT -5
A 4 stroke engine is easily explained by icpe (ickpee)
I=intake-piston on the way down,intake valve opens------------1
C=compression-piston on the way up,both valves close------2
P=power-plug fires, sends piston down both valves closed----3
E=exhaust-piston on the way up, exhaust valve opens----------4
Crankshaft rotates twice for every 1 revolution of cam
The piston is at top dead center twice during 1 cycle,power, and exhaust/intake
;D
so, it is possible to install the cam 180 degrees out, if the crank is not on the timing mark. you need to check both.
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Post by sailracer on Aug 10, 2013 9:36:55 GMT -5
[replyingto=ltdhpp]ltdhpp[/replyingto]Exactly right, It eliminates everything but the firing circuit. It's possible that a heavy load or intermittent short could exist.If it doesn't die out, Its not the trigger pickup. If it does, it probably is ;D
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Post by sailracer on Aug 10, 2013 1:17:55 GMT -5
WHY? were you having a problem?the gains you would get are negligible for the amount of oil in the sump. I would just leave well enough alone JMO No, I am not having a problem. I am just trying to figure a way to move more oil so that in the future I may just try to install an oil cooler. I have as yet to see an engine that didn't benefit from a higher oil flow. Even with a small amount of oil in the sump the oil still removes heat from the engine parts. You can leave well enough alone if you want to, not me. New and better stuff would never be found if everybody just left well enough alone. I see the point if you are adding a cooler, without one , you are just moving hot oil around faster, with less time to"sit" and cool a little |
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Post by sailracer on Aug 10, 2013 0:03:33 GMT -5
>:(Lucky dog!! I wish they gave me one too. I'm trying a hoca piston in the bbk,I put new rings on the scrappys piston, got a new head with the right valves in it, but compression is way low. I dont know what it was before I overheated it but the small factory piston gives me 160 psi, and the 50mm  -100. Not good. I just don't have any use for it, I really never did, and recent changes in my life I'm thinking its better to just sell it to somebody who can use it, here it will just collect dust... So you have a new head, cylinder, piston, and installed new rings.. And all your getting is to 100 psi ? did you try squirting a little oil down the spark plug hole and trying another compression test ? yeah, I did. Maybe because I used a used head gasket, cause it was only for a test? same piston. new rings.same cyl.new head I'm going to try the hoca piston with 1 and two gaskets. maybe Ill try the scrappy again with different gasket |
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Post by sailracer on Aug 9, 2013 18:10:40 GMT -5
DX
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Post by sailracer on Aug 9, 2013 18:09:25 GMT -5
From what I understand, you can no longer get those motors in the U.S. They(china-the factory that made them) lost their EPA rating, so customs does not allow them in.This comes from partsforscooters.
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Post by sailracer on Aug 9, 2013 18:04:54 GMT -5
[replyingto=jeffery5568]jeffery5568[/replyingto]If I were you, I would atleast put a small bead of weld there. I don't trust superglue for the long-haul. Especially on an application like that! If that nut comes loose at 8,500 rpm, it's gonna be like a bullet.  |
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Post by sailracer on Aug 9, 2013 15:29:16 GMT -5
>:(Lucky dog!! I wish they gave me one too. I'm trying a hoca piston in the bbk,I put new rings on the scrappys piston, got a new head with the right valves in it, but compression is way low. I dont know what it was before I overheated it but the small factory piston gives me 160 psi, and the 50mm -100. Not good. |
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Post by sailracer on Aug 9, 2013 12:43:37 GMT -5
:DWoW! great job...Should give you lots of pride! it's an accomplishment  |
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Post by sailracer on Aug 9, 2013 12:02:00 GMT -5
What you need is 1-motion activated floodlights
2-inexpensive surveillace camera with recorder
3-large doberman,shepard,rottweiler or mastiff
4- the toughest kid in the neighborhood on your side
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Post by sailracer on Aug 9, 2013 11:50:57 GMT -5
The pickup is just signal/no signal. Looks like you have an electrical "gremlin in there. You tried a new cdi, just a shot in the dark, but try disconnecting the wire from the stator to the regulator.(assuming it's an a.c. system) just use the HV wire to the cdi. and double check all grounds.also, if you have an auto choke or an electrical enricher, disconnect it Attachments:
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Post by sailracer on Aug 9, 2013 10:44:26 GMT -5
Ok either something is wrong, or scrappydog BBK sucks. I put new rings on the piston that came with the BBK. Qmb 139-37mm piston-all stock=160PSI=starter cranks easy QMB139-50mm BBK A9 cam SDS= -100 PSI ???starter lugs  When the new base gaskets arrive, I will test the hoca piston with1 &2 base gaskets (SDS is scrappydog scooters) rechecked the motor in the scooter (just to make sure gauge is ok-180 psi,and it turns over easy.) |
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Post by sailracer on Aug 9, 2013 7:58:01 GMT -5
[replyingto=sylvrekat]SylvreKat[/replyingto]That is a full size touring motorcycle trunk. It would probably dwarf the scooter. Nowhere in the 38 pages of compatibility does it mention a bike of even similar size to a scooter. (I'ts real nice though ;D)
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jet
-100. Not good.