-20mpg fuel loss


Information and questions on GL1200 Goldwings (1984-1987)
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jcg022897
Posts: 5
Joined: Mon Aug 15, 2016 9:32 pm
Location: Hoopeston Il
Motorcycle: 1984 GL1200I Interstate

-20mpg fuel loss

Postby jcg022897 » Mon Aug 15, 2016 10:13 pm



Recently i changed my sparkplugs in my 84 gl1200 Interstate. One of the spark plugs was stuck in the head so bad when i took it off it broke with the threads in the head. I proceeded to take the head off to have the spark plug removed. The shop had to put a helicoil in it. When i put the head back on with new parts and new timing belts I have had the fuel loss ever since. I checked and double checked on what went wrong with the bike. My timing is right on. The carbs have been synced. Any ideas for me to check?

Jeremy



David2953
Posts: 28
Joined: Wed May 19, 2010 10:36 pm
Location: Minnesota
Motorcycle: 82 Honda

Re: -20mpg fuel loss

Postby David2953 » Thu Aug 25, 2016 9:46 pm

I would make sure its running on all 4 cylinders. Check compression and spark and valve clearances. Maybe one cylinder is not working properly so more throttle is needed and mileage goes way down.

jcg022897
Posts: 5
Joined: Mon Aug 15, 2016 9:32 pm
Location: Hoopeston Il
Motorcycle: 1984 GL1200I Interstate

Re: -20mpg fuel loss

Postby jcg022897 » Fri Aug 26, 2016 10:38 am

Thank you David for replying. I have checked the compression and it came out to 125 on all 4 cylinders with all the spark plugs out. Tested the coils and wires. Everything checked out good. As far as the valve clearance i cant check due to it being a hydraulic system. It just racks my brain on what went wrong.

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twocams
Posts: 554
Joined: Tue Sep 29, 2015 11:25 am
Location: Grants Pass, Oregon
Motorcycle: 1985 GL1200 Aspencade, 2003 K1200GT BMW, 1969 R69S BMW
Sold : 84 V65 Magna, 82 Moto Guzzi, XS 1100 Yamaha,84 Wing Int., 80 650 Special, Only new bike 82 XV750 Virago (Guam),Honda 250,84 R100RT BMW,87 K100 LT BMW,93 K1100 LT BMW, 91 535 Virago, Honda 50

Re: -20mpg fuel loss

Postby twocams » Fri Aug 26, 2016 12:28 pm

I have to agree they do have hydraulic lifters. But my Honda book says they also use shims. You may do some reading to find out how they are used/ where exactly in the head. When you say -20...what is your gas milage now?

twocams

jcg022897
Posts: 5
Joined: Mon Aug 15, 2016 9:32 pm
Location: Hoopeston Il
Motorcycle: 1984 GL1200I Interstate

Re: -20mpg fuel loss

Postby jcg022897 » Fri Aug 26, 2016 1:43 pm

My fuel mileage started out at 53 mpg now it is down to 32. It was not a steady decline either.

David2953
Posts: 28
Joined: Wed May 19, 2010 10:36 pm
Location: Minnesota
Motorcycle: 82 Honda

Re: -20mpg fuel loss

Postby David2953 » Sat Aug 27, 2016 8:44 am

Hmm, I guess you can rule out tappets. Compression should have been higher, but if it is even on all 4, that's good. If you held the throttle wide open for the tests it would give higher readings.
Maybe the choke linkage got bent and one or more chokes are not turning off all the way. Maybe the choke cable is miss-routed or miss-adjusted. Maybe one of the throttle slides is stuck open.

jcg022897
Posts: 5
Joined: Mon Aug 15, 2016 9:32 pm
Location: Hoopeston Il
Motorcycle: 1984 GL1200I Interstate

Re: -20mpg fuel loss

Postby jcg022897 » Sat Aug 27, 2016 10:55 pm

Okay I'll check that out

jcg022897
Posts: 5
Joined: Mon Aug 15, 2016 9:32 pm
Location: Hoopeston Il
Motorcycle: 1984 GL1200I Interstate

Re: -20mpg fuel loss

Postby jcg022897 » Tue Aug 30, 2016 6:06 pm

Ok i checked the specs on the choke and throttle. Both are fine. I did talk to a mechanic today about my situation and he stated that when i changed my head gasket it altered the timing in some way do to the conditions of the bike when i ride. It has been running warmer than previously and the exhaust has been darker. My question now is how do i check the timing? I know that the camshaft and crankshaft line up on the marks.

Jeremy

User avatar
twocams
Posts: 554
Joined: Tue Sep 29, 2015 11:25 am
Location: Grants Pass, Oregon
Motorcycle: 1985 GL1200 Aspencade, 2003 K1200GT BMW, 1969 R69S BMW
Sold : 84 V65 Magna, 82 Moto Guzzi, XS 1100 Yamaha,84 Wing Int., 80 650 Special, Only new bike 82 XV750 Virago (Guam),Honda 250,84 R100RT BMW,87 K100 LT BMW,93 K1100 LT BMW, 91 535 Virago, Honda 50

Re: -20mpg fuel loss

Postby twocams » Wed Aug 31, 2016 10:39 am

You need to remove that plug on top of the engine. The one you removed when putting the timing belts on. I found there is a nice spray of old when started. So you need a sight glass adapter to screw into the hole. Then get your timing lite out and hook it up. And shine in da hole. :P Its all explained in your book.

twocams




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