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Post by triker on Mar 31, 2013 22:01:00 GMT -5
I don't lock tight them, and have never had one come loose. A 150 intake will not help much if the intake port on the head is not enlarged to match, but yes it will fit.
Roy
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Post by triker on Mar 31, 2013 21:30:50 GMT -5
Hmm, interesting. sounds easy enough.
Roy
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Post by triker on Mar 31, 2013 21:06:39 GMT -5
Just the four rocker arm nuts. I just snug the two on the side, I'm not sure about the specs. my manual doesn't even show those.
Roy
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Post by triker on Mar 31, 2013 20:57:40 GMT -5
I will probably head for Meadview AZ. this fall, to visit some of the family, but wont have time to scoot it though.
Roy
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Post by triker on Mar 31, 2013 20:49:03 GMT -5
I was going to make one out of brass tube with flat ends soldered. I would also buy a few, if you sell them.
Roy
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Post by triker on Mar 31, 2013 20:34:02 GMT -5
They should be torqued to 15 ft lbs. If you torque them to 24ft lbs and you might break something. I snapped off the corner of a rocker arm assembly when I accidentally set the torque wrench to 25 ft lbs  Roy |
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Post by triker on Mar 31, 2013 18:47:24 GMT -5
I did some more test fitting. This time I used a 47mm piston and no base gasket. At top dead center the piston sticks out of the cylinder by .50mm. I will test fit a 50mm piston next. I do believe with a single base gasket the piston will not travel out of the cylinder. Note: The 39mm piston I have has a fairly high domed top. The 47mm piston has a concave top and the 50mm is slightly domed.
Roy
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Post by triker on Mar 31, 2013 14:27:20 GMT -5
I got a little time to tear the new engine down and started to install a hoca 44 mm stroker crank. I just test fit the stock 39mm piston and jug. At top dead center the piston is flush with the deck of the cylinder.   I might just go with this set up for now and add the ncy 50mm bbk later. Just to see the difference. The stock crank has a 22 tooth oil pump drive gear and the oil pump has a 47 tooth driven gear. The hoca crank has a 16 tooth drive gear. Two options are available. 1) press the stock oil pump drive gear onto the hoca crank. 2) change the oil pump driven gear and oil pump. I cannot just change the 47 tooth driven gear to one with 33 teeth I must change the pump also. I knew this before hand and already have the correct driven gear and pump. Roy |
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Post by triker on Mar 30, 2013 15:59:42 GMT -5
This is the mathematical formula to calculate ring end gap.
Bore in millimeters/25.4 = Bore in inches: 47/25.4=1.850
Top ring: Bore in inches x .004: 1.850x.004=.007
Second ring: Bore in inches x .005: 1.850x.005=.009
Roy
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Post by triker on Mar 29, 2013 23:55:10 GMT -5
Ok, I think I figured it out. The stock chain is 41 links if you count the outer links or 82 links if you count the inner and outer links.
Roy
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Post by triker on Mar 29, 2013 23:53:24 GMT -5
The stock chain is 82 links. I haven't found an  link chain and haven't found extra links. So a longer chain may not be possible. Roy |
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Post by triker on Mar 29, 2013 23:26:25 GMT -5
Does anybody know how many links are in a stock 139qmb engine timing chain?
Roy
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Post by triker on Mar 29, 2013 23:23:06 GMT -5
Nice post triker I am curious though... How are you going to compensate for the extra 1.3mm @ TDC? Stack bases gaskets or a spacer? And will the cam chain length be an issue? I'm not trying to needle you ~ just curious. Lot's of pics, please! I haven't decided yet I am going to test fit it first and see exactly how much the piston comes out of the cylinder. If I use a spacer I will still need two base gaskets. I'm not sure about the chain yet, but I don't think it will be a problem. If the chain is to short I will mill off the top of the piston. I need to measure how thick the top of the piston is. I don't want to make it to thin. Or I may try to find a longer chain. But even one link may make it to long. Roy |
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Post by triker on Mar 29, 2013 23:03:57 GMT -5
Well If all goes well tomorrow and I get my to do list done I will start on this project. I will have to use a different carb than the keihin I ordered. The site I ordered from(MX Motorsports) pulled the ol switcharoo and sent me a cheap knock off. Also I ordered copper exhaust gasket rings and they sent regular gasket rings. I'm not going to go into details of the phone call I made to them but I will not recommend them to anybody. So I will be looking for another place to get a Keihin 20mm carb. Any body got a good lead? In the mean time I have a 19mm carb and a 23mm carb but If I use the 23mm carb I will have to replace the throttle cable or modify the cable mount.
Roy
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Panda Fear
by: triker - Mar 27, 2013 0:55:18 GMT -5
Post by triker on Mar 27, 2013 0:55:18 GMT -5
Ya, that is cool. Leo You do good work. Now, how bout one for the bears?
Roy
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link chain and haven't found extra links. So a longer chain may not be possible.