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Post by triker on Jun 15, 2013 17:05:49 GMT -5
I have 4 sets of gears. When I ordered a new set I also order a stock counter shaft reduction gear. It cost me an extra $30 bucks though, but this way I don't have to press the gears off and on when I want to change them. All my sets are hoca gears and they were real tight going in. I have an 80 ton press at work and the press gauge was reading about 10 tons to get the stock gears apart.
Roy
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Post by triker on Jun 14, 2013 8:53:42 GMT -5
Indian Head Shellac has been around for years and is usually used on disposible gaskets that you scrape off and toss after one use. On rubber or metal gaskets that get reused a non-permanent RTF or non-hardening Permatex compound is usually the better choice. I agree, I use this on paper type non-reusable gaskets. For metal head and manifold gaskets I use the high temp copper type sealer. I have used the indian head type many times and have never had a problem with it. For a rubber type gasket I use rtf silicon sealant and not gasket maker. If I put parts together that I don't have a gasket for I will use a silicon gasket maker. I also use the appropriate kind, some are not suitable for fuel, ect. Roy |
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Post by triker on Jun 12, 2013 11:49:20 GMT -5
That rubber seal keeps the air from blowing out around the head and helps eliminate vibration of the shroud. You can make a custom fit gasket by using some high temp silicon. Spray a mold release agent (pam will work, or mist a light coating of oil) on the head and shroud so the silicon wont stick, assemble parts fill with silicon and allow to cure( may take a few days to fully cure a thick bead). Disassemble and trim excess. Walla custom gasket.
Roy
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Post by triker on Jun 12, 2013 11:00:57 GMT -5
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Post by triker on Jun 10, 2013 11:26:53 GMT -5
I juts got a 20mm carb. I opened up the bowl to see what size jets are in it. They are mystery jets as neither one is marked. But that is not why I'm typing this. I then measured the outlet of the carb to determine if it was a 20mm. I measured right at the end. and it measured 19.77mm. Ok so it's a little small. now this is where it gets interesting. I use a telescoping gauge to measure deeper down by the throttle plate, and at this point it measures 18.45mm. I get out my notebook to write these two measurements down. I notice that in the list of carb measurements I had measured an 18mm carb and a 19mm carb. these measurements are as follows:
18mm carb at the lip:18.52mm, at the throttle plate: 18.45mm
19mm carb at the lip: 19.25mm, at the throttle plate: 18.45mm
20mm carb at the lip: 19.77mm, at the throttle plate: 18.45mm
My 24mm fuel injection throttle body measures 23.95mm at the lip and throttle plate.
Now I'm wondering why I have 3 different size carbs, but they all have the same size throttle plate. Any one care to enlighten me?
Roy
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Post by triker on Jun 10, 2013 0:32:49 GMT -5
Not sure if all auto stores will have it. I get mine at oreillys. It happened to be the first place I stopped and they had it so I didn't look at any other stores. I recommend you call around.
Roy
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Post by triker on Jun 9, 2013 23:55:56 GMT -5
I am late to this party and didn't read that you already got a gasket. I don't use those ring gaskets because if you don't tighten the exhaust right they will leak. I like the flange to tighten up flat against the head with as much gasket surface area as possible.
Roy
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Post by triker on Jun 9, 2013 23:49:41 GMT -5
Yes, a 150 intake will fit a 50 head. But unless you use a head that has been ported out it will not give you better performance. Also you must use a larger a carb with a larger outlet as the 150 manifold has a bigger diameter inside.
Roy
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Post by triker on Jun 9, 2013 22:53:37 GMT -5
Get ya a sheet of header gasket material. I use mr gasket brand. It comes in a 10"x10" sheet. I got mine at o-reillys.
Roy
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Post by triker on Jun 9, 2013 17:29:16 GMT -5
I think if they start out concave the top of the piston is already weak. A high compression engine plus running hot and pre-detination will all contribute to this also. Larry001964's stroker engine did this to a piston also, and he had a better quality ncy domed piston.
Roy
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Post by triker on Jun 9, 2013 16:22:02 GMT -5
They do come concave on the top. I have a gotten several that are concave. This is a 39mm piston. I have a 47mm that is concave that is installed in the engine I have in my trike. I have a 50mm some where on my shelf, I just didn't want to dig it out.  Roy |
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Post by triker on Jun 8, 2013 22:09:06 GMT -5
You are welcome. I had it wrote down in my note book, it just took me a while to find it.
Stock primary ratio is: 52/16 = 3.25
Stock secondary ratio is: 51/15 = 3.4
Stock final ratio is: 3.25 x 3.4 = 11.05:1
Roy
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Post by triker on Jun 8, 2013 21:25:51 GMT -5
Stock primary gears are 16/52 and the secondary is 15/51
secondary final ratio's are:
15/51=11.05:1 (stock)
16/50=10.15625:1
16/42=8.53125:1
18/46=8.3055553:1
17/41=7.4027775:1
Hope this helps.
Roy
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Post by triker on Jun 8, 2013 21:07:29 GMT -5
Sounds good.  Roy |
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Post by triker on Jun 8, 2013 21:01:19 GMT -5
I do not know about the long case engine, but all 3 of my short cases came with 15/51 gears. Doug, I have 4 different gear sets for a 139qmb they are: 16/50, 16/42, 18/46, 17/41.
Roy
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