piston pin and piston


Information and questions on GL1200 Goldwings (1984-1987)
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Dale Landan
Posts: 25
Joined: Wed Sep 04, 2013 1:47 pm
Location: Littlerock CA
Motorcycle: 1982 Honda GL1100 Aspencade and 1982Gl1100 standard

piston pin and piston

Postby Dale Landan » Fri Nov 01, 2013 5:24 pm



Does any one know what the diameter of the piston pin is of th GL1200 and what is the height measurement from the top of the piston pin hole to the top of the piston ? ( i am researching the idea of using 1200 pistons in a GL1100 Aspencade engine know the stroke is different , but would it be possible to ream the pin holes in my rods to accept the 1200 piston pins) ?



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thrasherg
Posts: 1837
Joined: Tue Oct 20, 2009 11:21 am
Location: Plano, TX
Motorcycle: 2004 GL1800, 2005 Honda Shadow 750, 2008 Yamaha R6 with RG500 engine, CRF450X, CRF230, CRF250X, XR200, CR500

Re: piston pin and piston

Postby thrasherg » Tue Nov 19, 2013 6:43 pm

Not to be rude, but there is no way you will ream the little end of the con rod to accept a larger gudgeon pin and maintain goldwing reliability.. You are looking at instant bad Karma!! There is not a lot of excess metal on the little end of a con rod so reaming it to accept a larger diameter pin is going to make it weak to the point of failure.. Hopefully the gudgeon pins on the 1100 & 1200 are the same size, so you don't have to ream anything!!
What are you hoping to gain by using 1200 pistons? Just interested in the end goal here..

Gary

Dale Landan
Posts: 25
Joined: Wed Sep 04, 2013 1:47 pm
Location: Littlerock CA
Motorcycle: 1982 Honda GL1100 Aspencade and 1982Gl1100 standard

Re: piston pin and piston

Postby Dale Landan » Tue Nov 19, 2013 7:44 pm

Gary, I have a spare 1980/81 engine, the bore is bad. New first or second oversize pistons are not to be had. 1200 piston are available new. Reasoning along these lines I thought that perhaps with a new set of standard 1200 pistons and the cylinders in my cases bored out to the standard 1200 bore size I could revamp this engine. The cylinders have enough meat to accept the std. 1200 bore, but I need to find out the pin dia. to make sure my rods will work. Also need to know the Clarence from the top of the rod hole in the piston to the top of said piston making sure the piston would not encounter the valves or the head. Hope that explains my idea. Dale

User avatar
thrasherg
Posts: 1837
Joined: Tue Oct 20, 2009 11:21 am
Location: Plano, TX
Motorcycle: 2004 GL1800, 2005 Honda Shadow 750, 2008 Yamaha R6 with RG500 engine, CRF450X, CRF230, CRF250X, XR200, CR500

Re: piston pin and piston

Postby thrasherg » Tue Nov 19, 2013 7:48 pm

Thanks Dale, but whilst pistons for the 1100 may not be available from Honda, I would have thought you could get aftermarket pistons without too much trouble. I only moved to the USA 7 years ago, so am not too familiar with American piston manufacturers, but I am sure in Europe you could get some, it would be cheaper than machining your engine to take other pistons!! Hopefully someone on here can suggest a USA manufacturer, failing that I would be happy to contact some friends in Europe to see if we can get some for you.

Gary

Dale Landan
Posts: 25
Joined: Wed Sep 04, 2013 1:47 pm
Location: Littlerock CA
Motorcycle: 1982 Honda GL1100 Aspencade and 1982Gl1100 standard

Re: piston pin and piston

Postby Dale Landan » Tue Nov 19, 2013 8:01 pm

Gary, I have access to a boring bar that will do the job. I have done a fairly active after market search for the pistons and have come up nil. But I did manage to find the 1200's. I am hoping that a 1200 person could supply me with the info I need to finish off the "research" that I have done over the past few months now and still awaiting the info needed. Any help you might see fit to pass along would be greatly accepted.

User avatar
thrasherg
Posts: 1837
Joined: Tue Oct 20, 2009 11:21 am
Location: Plano, TX
Motorcycle: 2004 GL1800, 2005 Honda Shadow 750, 2008 Yamaha R6 with RG500 engine, CRF450X, CRF230, CRF250X, XR200, CR500

Re: piston pin and piston

Postby thrasherg » Tue Nov 19, 2013 8:05 pm

Sorry Dale, I don't have anything of much use to pass along, but do let me know if you want me to have a search in Europe for any parts (assuming you are in the USA!).

Best of luck with your project , I have a Suzuki RG500 engine (4 cylinder 500cc 2 stroke engine, that I rebuilt both cranks and then bored and fitted pistons from a RGV250 to take the engine to 600cc.. There was a lot of work involved in that, so I can imagine what you are trying to do will be even more challenging (2 strokes are a lot easier than 4 strokes!!). Still need to finish the project!! :oops:

Gary

Dale Landan
Posts: 25
Joined: Wed Sep 04, 2013 1:47 pm
Location: Littlerock CA
Motorcycle: 1982 Honda GL1100 Aspencade and 1982Gl1100 standard

Re: piston pin and piston

Postby Dale Landan » Wed Nov 20, 2013 5:10 pm

Yes I am located in California near Palmdale where all of the space shuttles were built with my help of course. I am a retired space ship mechanic in all honesty. My first bike that I owned in th mid 1950ies was a Triumph TR 5 ridged frame and I road several Enduros with it never won one, but had a lot of fun. I have bought a few items for my 1982 Aspencade that was a basket case and came to me missing carburetors, false tank and air inflation system, seat, and lower fairings to mention the major items. The engine was frozen (rings to piston walls) and was last registered in California in 2008. I have never worked on Honda's before though I did own a couple. I bought this bike and a GL1100 standard for the sum of 800.00 dollars the standard runs nicely.
As for the Aspencade I got the engine free after pulling the heads and working with wet and dry 500 grit sand paper and a pointed awl to free all four pistons engine now turns over by hand nicely. I have replaced all the missing components and have gotten to the point where I am almost ready to try turning it over on the starter (which worked before while it was out ) I suspect my troubles now lie in the neutral safety switch (can not read continuity when in neutral) and the starter relay which seems to be bad ordered one fron China should be here this week also I an going to remove the front cover again and check out the shifting drum to make sure it comes in contact with the switch.I am told some times they get fouled up and hang up so perhaps I might win one there maybe. Dale

rzaugg
Posts: 88
Joined: Tue Oct 01, 2013 10:04 pm
Location: Cedar Rapids, Ia
Motorcycle: 1984 GL1200 Aspencade
1989 GL1500 Aspencade

Re: piston pin and piston

Postby rzaugg » Fri Nov 22, 2013 1:37 pm

Haven't had the need to get AM pistons for several years, but when I did, I went to Ross racing pistons. Long story short, I needed .060+ pistons for a 4 cyl. Mercdedes Benz engine and they were only available directly from Germany. I was able to call Ross and give them the specs. and got forged pistons for about 1/3 the price of the MB pistons. Because they are forged pistons, they will be a little noisy at cold start up, but that will go away. Although I can't even guarantee that you will have that in a flat 4 engine. Have only used them in Vee's and Inlines. It's something to check into though.




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