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Post by tvnacman on Jun 5, 2015 18:22:11 GMT -5
I have seen the engine ground under a valve cover bolt, I don't care for that spot. I prefer on the fan cover bolt or on the front of the cvt bolt cover towards the front.
the grounds come from the battery negative terminal with a heavy wire then bolts to the frame with a few wires at that point all of the connections from the battery on need to be checked cleaned the crimps and all. I bet it smoked when you were using the electric starter.
John
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Post by geh3333 on Jun 5, 2015 18:23:32 GMT -5
The gaskets on the valve cover really don't make a difference with the ground , since the bolt is threaded into the head. Yeah i know, seems to be a bit of confusion from some others though...thanks... i will get the scooter tore into soonish, need to get my new hi compression 155 into the other 21b, this one will have to wait til after rotation at the hospital is over. |
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Post by chromestarhustler on Jun 5, 2015 18:28:20 GMT -5
tvnacman
Definite possibility, cant say i love the valve cover ground myself, but thats where it was, considering the body has to come off to rehash the harness, and check for damage i can definitely change things a bit, its not my only scooter, so its not a rush job or an emergency by any means, thanks for the help, i will keep you apprised of the situation.
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Post by geh3333 on Jun 5, 2015 18:36:22 GMT -5
I have seen the engine ground under a valve cover bolt, I don't care for that spot. I prefer on the fan cover bolt or on the front of the cvt bolt cover towards the front. the grounds come from the battery negative terminal with a heavy wire then bolts to the frame with a few wires at that point all of the connections from the battery on need to be checked cleaned the crimps and all. I bet it smoked when you were using the electric starter. John Either way you are grounding mainly through the threads. The CVT cover is painted, yes you can scrap the paint off, but either way you are fighting a gasket and mainly just grounding through the bolt threads. And it all is connected to the engine case. The plug is also grounded through the head. I really don't see any reason not to use the valve cover bolt. I know we all have our preferences , but in this case , I just don't see the point of using a different bolt. We also need to remember , when using the valve cover bolt , its not just grounding from one bolt . all 4 bolts are connected to the head through the threads and the valve cover usually does make metal on metal contact, unlike the CVT cover or the side cover of the engine , which both have full gaskets between them and the engine case. The valve cover would be the first and best choice. As long as it has the small rubber gasket. |
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Post by tvnacman on Jun 5, 2015 19:15:22 GMT -5
in general the bolts that mount the starter are on the left side cover for both the 50 and 150cc engine, the starter grounds where it mounts. the heavy engine ground is for the high current from the electric stater not the ignition system.
John
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Post by JerryScript on Jun 5, 2015 21:40:08 GMT -5
Ground wire is attached to the 'head stud"? Is that the valve cover bolt, or the cylinder head bolt? Either way, not a very good ground point. The jug is separated from the crankcase by a paper gasket (no conduction there), and the valve cover is separated by a rubber o right (sort of), so no conduction there. Can't believe there is an electrical lug under a cylinder head nut ... maybe something on the side of the head? Ground path can only be thru the head bolts or down the valve chain. Anyway - there isn't a ground directly on the crankcase anywhere? The ground strap is connected to the valve cover on more than half of all models. |
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Post by tvnacman on Jun 6, 2015 7:21:39 GMT -5
Ground wire is attached to the 'head stud"? Is that the valve cover bolt, or the cylinder head bolt? Either way, not a very good ground point. The jug is separated from the crankcase by a paper gasket (no conduction there), and the valve cover is separated by a rubber o right (sort of), so no conduction there. Can't believe there is an electrical lug under a cylinder head nut ... maybe something on the side of the head? Ground path can only be thru the head bolts or down the valve chain. Anyway - there isn't a ground directly on the crankcase anywhere? The ground strap is connected to the valve cover on more than half of all models. Yes Jerry you are correct I have been seeing them on the valve cover more and more. My first two scooters were on the fan cover bolt at 12 o'clock. I like the starter hold down bolt. John |
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Post by rcq92130 on Jun 6, 2015 13:47:00 GMT -5
The ground strap is connected to the valve cover on more than half of all models. Yes Jerry you are correct I have been seeing them on the valve cover more and more. My first two scooters were on the fan cover bolt at 12 o'clock. I like the starter hold down bolt. John Yep, John. Mine is on the starter hold down bolt - thought they ALL would be there, since that's the place of highest current. Odd a manufacturer would choose any other place (though a crankcase location, such as muffler mount (I have a secondary ground there) is probably just as good. |
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Post by geh3333 on Jun 7, 2015 17:26:38 GMT -5
Yes Jerry you are correct I have been seeing them on the valve cover more and more. My first two scooters were on the fan cover bolt at 12 o'clock. I like the starter hold down bolt. John Yep, John. Mine is on the starter hold down bolt - thought they ALL would be there, since that's the place of highest current. Odd a manufacturer would choose any other place (though a crankcase location, such as muffler mount (I have a secondary ground there) is probably just as good. The starter bolt would be the best place. The valve cover would be my second choice, then again all the bolts connect the entire case together through metal on metal contact , so I'm sure it doesn't make a difference. |
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