The Harbor Freight GX200...
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Jerryburger
Admiral Annoy
Man! That's interesting! The first thing my brother and I did was pull our old B/S motors apart to see what made them tick, but it's a little harder to justify doing that on a brand new motor... THX for saving me and others the bother!
jr dragster T
New member
Did you make sure you torque down the rod end bolts to 145 in pounds?
Jerryburger
Admiral Annoy
Hope you don't mind me asking... Is that the stock con-rod/dipper in the 3rd picture? ...and, isn't it amazing how well splash lubrication works, even OHV models? You'd think that there's NO WAY oil could be flung clear up into the valve cover, but not one of the "Hypo GX200s" I've seen ever attempts to change to a pump. This stuff amazes me to no end. I can't wait for time (Time? Hah!) to do an autopsy on my Tecumseh OHV. No harm can be done to it....!
Thanks again for keeping the rest of us informed on this. Very interesting!
Thanks again for keeping the rest of us informed on this. Very interesting!
Jerryburger
Admiral Annoy
Sorry- another observation/pondering question:....
Isn't it weird that a modern engine doesn't follow the common practice of making the intake valve larger than the exhaust? The last motor I saw like-sized valves on was the B/S 60000 series motors. (2hp) Even the 3hp (8-B) eventually went with the larger intake. I guess that's why I'm not getting the Big Bucks to be an engineer!
Isn't it weird that a modern engine doesn't follow the common practice of making the intake valve larger than the exhaust? The last motor I saw like-sized valves on was the B/S 60000 series motors. (2hp) Even the 3hp (8-B) eventually went with the larger intake. I guess that's why I'm not getting the Big Bucks to be an engineer!
Pyrotechnic
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It's probably simpler and cheaper to make one valve and have one part number that does double duty for both the intake and exhaust. Also, the required valve sizes for the displacement and their combined diameters don't even come close to interfering with the bore, so having a bigger intake and smaller exhaust to meet the valve size requirements is a non issue here.
That was not the stock rod. That is a ARC Billet Aluminum connecting rod, with bearing inserts. It has a hole in the dipper to force-feed oil into it. Genuis.
What do you mean? Every engine I have laid my hands on have a larger intake valevs. This includes:
Briggs 2HP
Briggs 3HP
Briggs 3.5HP
Briggs 5HP
Genuine GX110
GX200 Clone
Tecumseh 6.5HP
Briggs and Stratton 5.25HP...
All larger intake valves than exhaust. I have a pair of the 2HP valves. Definitely follow the larger/smaller rule.
You are correct. A stock rod will not include bearing inserts, will be rougher (not shiny, unless polished), and will not have the hole in the dipper to force feed oil.
Let me guess, 3.5HP or more correct? My 3.5 had one, and so did my lawnmower (5.25... cast iron ones are much better for racing. You'll need cast iron ones anyways if you plan on getting them ground down.
However, don't think it's all bad for the Clones. Hondas are $450+. Clones go for $100-$130!
How are they better? For one, their side covers are not compatible with the Genuines. How is this good? Because the Clones carries larger bearings.
Also, the Clone carries a hardened crankshaft...
It's not all negatives when you go cheap.
How are they better? For one, their side covers are not compatible with the Genuines. How is this good? Because the Clones carries larger bearings.
Also, the Clone carries a hardened crankshaft...
It's not all negatives when you go cheap.
jr dragster T
New member
Yeah the ARC rods have a hollow dipper that forces oil into the bearing.
Oh the irony.
Jerryburger
Admiral Annoy
Geez! Now I'm beginning to wonder if I had too many preservatives in my food when I was a kid or something.... To the absolute best I can remember, on the B/S 6B, 8B, (early alumininum motors) and the B/S 60000 motors, the valves were the same size; the exhaust being stamped with an "x" on top to keep it from being confused with the intake which was a different material. Maybe my neurons have crossed and I've got the memory of my brother's old cast iron 5s B/S burned in....?!? I have a 60000 on the Treefrog, but it's not worth yanking the head in this heat (112f) just to prove a moot point.
Isn't image#6 a shot of the stock clone head with what looks like similar sized valves?
Either way, I think I need to get my eyes checked.
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