1976 Gold Wing Valve springs in upside down


Information and questions on GL1000 Goldwings (1975-1979)
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pablo2020
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1976 Gold Wing Valve springs in upside down

Post by pablo2020 » Thu Feb 13, 2020 12:28 pm



I recently re-built the heads & re-lapped the valves as I had to replace the head gaskets ,I did not read the work-shop manual which states the tightly wound end of the spring should be against the head & I re-built the cylinder but did not check to see what was the correct end of each valve spring ,just wandering if this will cause any serious mechanical or performance issues ,the bike has already been started & run and revved but only on the bike stand .



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SnoBrdr
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Re: 1976 Gold Wing Valve springs in upside down

Post by SnoBrdr » Thu Feb 13, 2020 3:02 pm

pablo2020 wrote:
Thu Feb 13, 2020 12:28 pm
I recently re-built the heads & re-lapped the valves as I had to replace the head gaskets ,I did not read the work-shop manual which states the tightly wound end of the spring should be against the head & I re-built the cylinder but did not check to see what was the correct end of each valve spring ,just wandering if this will cause any serious mechanical or performance issues ,the bike has already been started & run and revved but only on the bike stand .
I have no first-hand info but you'd think that if the engineers designed them to go in only one correct way that they should be put in that way.

If it didn't matter, I'd think that both ends would be the same.

Isn't it worth piece of mind just to put them back in correctly?

pablo2020
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Re: 1976 Gold Wing Valve springs in upside down

Post by pablo2020 » Thu Feb 13, 2020 3:58 pm

I guess there is a reason why Honda engineers designed them that way ,the Honda workshop manual does not give any reason as to why it's important they be put in the right way ,I also have a clymer GL 1000 manual and it does not mention anything about making sure the valve springs are placed in a specific way ,been scratching my head to try and figure if any damage could be done to the head or maybe loss in performance ,the od of the spring is the same it's just @ one end the last two coils are closer together ,maybe something to do with recoil rate .When I started the bike there was no excess noise and revved without hesitation and idled smoothely.

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Re: 1976 Gold Wing Valve springs in upside down

Post by WingAdmin » Thu Feb 13, 2020 5:16 pm

The reason is mass and intertia.

The more tightly wound end has more mass per inch than the loosely wound end, because there are more coils in a smaller area. This means there is more reciprocating mass.

At high engine RPM, the spring has to work harder to push the end of the spring, the rocker, and the valve open. This could delay the opening of the valve, as some of the spring compression is "used up" overcoming the extra mass. When closing the valve, again at high RPM, it could delay the closing of the valve as it again has to overcome the extra inertia of the tightly wound end.

At lower RPM, this likely won't have any effect. At very high RPM, it could potentially cause a piston to impact a still-closing valve.

We had this problem on the race car I crewed on many years ago, and the resultant impact broke a valve and sprayed metal throughout the engine, ending our race.

Whether or not this will actually have an effect on your 76 Wing, I can't say. If it were my bike, I'd probably open it up and fix it.

pablo2020
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Re: 1976 Gold Wing Valve springs in upside down

Post by pablo2020 » Thu Feb 13, 2020 6:34 pm

Thx for the advice & technical info , the Honda engineers had a good reason and probably one of the reasons the GL 1000 was one of the fastest production bikes in it's day ,I am not sure exactly how many of the springs are the wrong way and going by murphies law probably all are the wrong but maybe only one , I think I will take my chances and ride the bike like a gentleman & not revving above 7000 rpm & next winter do a tear down & re-build it properly ,if anything bad happens to the head over the summer I will definitely update the forum so others can be warned .

pablo2020
Posts: 8
Joined: Thu Jan 23, 2020 9:31 pm
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Motorcycle: 1971 cb 750 ,1970 triumph bonneville ,1976 honda gold wing ltd ,1982 honda cbx

Re: 1976 Gold Wing Valve springs in upside down

Post by pablo2020 » Mon May 25, 2020 12:15 pm

Update
Have since put on 1000 kms on the bike ,it was definitely a leaking head gasket as the smoking has stopped except for a slight smoking @ start-up & the bike is not going thru alot of oil . Have not noticed any difference in power with the misplaced valve springs & so far no mechanical issues ,have run it up to red line and it pulls stongly ,I used to own one of these bikes years ago & can't feel any difference in power, think will not mess with it if it ain't broke .



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