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Post by Grant on Jul 3, 2019 8:44:00 GMT -5
Hi Guys
I finally put my 1975H2C together but with the 1972H2 motor that came with it. I cleaned carbs and pre-adjusted all cables then went to start it........well my being over 70 may have something to do with it, but at 200lbs I barely was able to get a slow kick. I pulled the plugs and it kicked over like I remember a healthy H2 should (even turned over easily by hand) but when the plugs went back on, it was worse than an old 850 Norton on a compression stroke. I don't know the history of the motor but I'm thinking of making up some 3/16 and 1/4" spacers in place of the head gaskets. But just wondering if anyone has had a problem with excess oil in the crank that might cause this ( ie: gases not being able to exit the crank ), as that's about the only thing I can think of unless a previous owner shaved the heads and or barrels.
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Post by Walms on Jul 3, 2019 9:13:32 GMT -5
Spacers aren’t a good idea because you need to maintain the squish. I’d get a good compression gauge to see where you are at first. You’ll need one with a shrader valve at the threaded end to get a good reading.
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Post by kawonda750 on Jul 3, 2019 9:55:18 GMT -5
Did you have the engine apart? Was there oil put in the cylinders for storage ? Don't ask how I know this....
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Post by Walms on Jul 3, 2019 10:19:21 GMT -5
I forgot to address the oil in the crankcase... You’ll need a turkey baster with a chunk of hose attached. Take a carb off, put that cylinder to TDC and stuff that tube down in the crankcase to see if there is oil in there. Kicking it over usually isn’t enough to suck the oil up the transfers tho, and I’m sure you’d have a mess if it did happen and you kicked it over without plugs.
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Post by zambia on Jul 3, 2019 13:23:10 GMT -5
Or take all the plugs out and push it down a hill, then hoof it into 2nd gear..keep a towel over the plug holes though..
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Post by bake on Jul 5, 2019 14:59:50 GMT -5
I forgot to address the oil in the crankcase... You’ll need a turkey baster with a chunk of hose attached. Take a carb off, put that cylinder to TDC and stuff that tube down in the crankcase to see if there is oil in there. Kicking it over usually isn’t enough to suck the oil up the transfers tho, and I’m sure you’d have a mess if it did happen and you kicked it over without plugs. I thought I recall 3 drain plugs at the bottom of the crank just for this but looked on my H1 and can’t see any, or was I dreaming?
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Post by Walms on Jul 5, 2019 18:21:13 GMT -5
I forgot to address the oil in the crankcase... You’ll need a turkey baster with a chunk of hose attached. Take a carb off, put that cylinder to TDC and stuff that tube down in the crankcase to see if there is oil in there. Kicking it over usually isn’t enough to suck the oil up the transfers tho, and I’m sure you’d have a mess if it did happen and you kicked it over without plugs. I thought I recall 3 drain plugs at the bottom of the crank just for this but looked on my H1 and can’t see any, or was I dreaming? Yes, on the later cases there are little recirculation valves that can be removed to drain. In my case, pipes are in the way to easily get at them.
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Post by Grant on Jul 8, 2019 5:58:54 GMT -5
Thanks for the idea about the recirculation valves, I'll hunt for them and try and use them if possible. I've already got the exhaust pipes loose (to make sure there wasn't something stupid like them being blocked).
I'd like to get this bike on the road before I start on the 1969 H1 or 1970 A7SS. If not, it's back to the aluminum spacers just to see if I can kick it over and get it running.
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Post by Curtis on Jul 8, 2019 6:17:11 GMT -5
There is a reason the compression is that high I doubt someone built that engine that way and then just let it sit Pull it apart and figure out why before you build unnecessary stuff
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Post by zambia on Jul 8, 2019 13:51:52 GMT -5
Yes, I definitely wouldn't run spacers to lower the compression - it will run poorly if at all: 3/16" or 1/4" is a massive amount in terms of port timing, squish (as Andrew said) etc. - 3/16" is almost 5mm and 1/4" is 6.4mm. If it spins easily by hand with no plugs in, then it definitely sounds like your compression is too high. It could be that your rings are very dry or rusty and creating friction? If you pull the heads you should be able to see if the cylinders have been decked air the heads shaved down - if so you could try a thicker base gasket (they come in copper in various thicknesses).
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Post by Grant on Jul 10, 2019 14:39:25 GMT -5
Hi Guys Well I found the three drain (I think) plugs and removed them, I collected the dripping oil overnight and the next day, I had about 1/2Litre from the right hand and center cyls and 1/5Litre from the left cylinder.
I hand kicked it over a few times without the plugs and left it for a day and only collected a teaspoons of oil.. I then put two plugs in and I'm back to not being able to kick it without jumping on the kick start lever 3 plugs is almost impossible. I've owned around 35 H2s over my life and none have been that bad.
Before I remove the engine and tear it apart I'm going to machine up something to thread into the spark plug hole and also hold with check valve a 0 - 300 psig gauge, as it is pretty tough kicking and holding the gauge by myself.
further updates to come.
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Post by Walms on Jul 10, 2019 15:47:26 GMT -5
This is the Crappy Tire compression gauge I have. It has the shrader valve at the tip that threads into the spark plug hole.
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Post by Curtis on Jul 10, 2019 16:16:17 GMT -5
If it is any consolation - I just turned away a Can Am 250 because it would barely turn over - crank bearings were piled up in it.
If it kicks over like an H2 should WITH the plugs out You have problems
Pull apart - inspect - rebuild as required
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Post by JA-Moo on Jul 10, 2019 18:44:53 GMT -5
Bummer, I got in late. Those are NOT drains, they are EPA reed valves to remove oil in the crankcase when the motor is running. They really shouldn't be messed with, too late now....
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Post by Walms on Jul 10, 2019 19:33:21 GMT -5
They also make nice drains. 🥴 Are the gaskets hard to get or something? I just plugged mine off with a solid gasket.
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