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post #1 of 9 (permalink) Old 10-17-2011, 11:00 AM Thread Starter
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have a 86 gw aspencadei get a rattle sound around 41mph and up when i accelerate gets a lot more rattle or when going up a hill if i back off on the throtlle less rattle the noise seems to come from the right side valve cover. the bike has app 45000 miles and it runs very good i use 89 octane and have put sea foam in the gast tank as well with the oil. will glas to hear suggestions. semperfi
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post #2 of 9 (permalink) Old 10-17-2011, 11:11 AM
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That could be a sticky lifter. Some members have had to adjust the rocker assembly to get rid of the noise, and I know there are plenty of posts here about that.

Dave Heffernan.
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post #3 of 9 (permalink) Old 10-17-2011, 01:35 PM Thread Starter
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thanks alot for the info, will check them out, new at this-semper7
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post #4 of 9 (permalink) Old 10-17-2011, 03:38 PM
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Are you in OD when you accelerate from 41 mph? You may be lugging the engine. They will "rattle" when you are lugging the engine. If it doesn't rattle normally and if you can keep your rpms up with out it rattling then it's probably that you are lugging the motor.

03 Honda XR650L
84 GL1200 Aspencade

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post #5 of 9 (permalink) Old 10-17-2011, 04:54 PM
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Some members have had success cleaning their engines out with seafoam and freeing a sticky lifter. Use the seafoam in the crankcase for 150 miles and change your oil. It will at least clean your motor up if nothing else. I tried that with mine, then even had a mechanic replace a valve and lifters, but unfortunately, my noise is from the crank somewhere. After all that work, he says I need a different motor. I still have the noise, but plan on running her til she croaks. Other than sounding like a diesel over 3000rpm, she runs good. I've even red lined her in 1st n 2nd to see if the motor would blow but she's still together.

Current Ride 84 GL1200a

Previous Rides in order from latest...

80 Harley FLT Tour Glide - sporty was too small
78 Harley XLS 1000 Sportster - My gift to me for not drinking for 1 year
?? Honda 3-wheeler 90cc - traded my 360 so my kids could have fun in the trails
68 Triumph Hardtail 12 over springer - my county bike..would break down too much to leave the county! but I had my trusty 360 at the same time
?? yamaha XS360 (6 speed)took it on a 3000 mile trip in 79 - rode 1,120 in 22 hrs.
68 Honda CB175 My 1st ride when I was 18
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post #6 of 9 (permalink) Old 10-17-2011, 07:33 PM
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With only 45,000 miles, I doubt you have any real problem. It's very common for the twelves to talk to you once in a while. If they get to yackin' too much you can quiet them by centering the rocker assembly.The procedure issimple and described in the Honda manual.

Another possibility is you are getting some pinging. Use regular gas in put some MMO in a few tanks. 89, or 91 will cause carbon buildup, as will lugging the engine.

You want to keep the motor above 3 grand, or you will break something. It's a motorcycle.











Why ain't we ridin'?
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post #7 of 9 (permalink) Old 10-17-2011, 08:03 PM
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It's the gas today we have to run with alcohol Honda requires to run preimum 91-93 octane and the old saying cheap gas it may say 85-89 or 91 octane but that is not always the case.I have a 1200 LTD and run 85 octane and it gets 45 to 50 miles to a gallon but I don't know if yours is a SEI or not Seafom makes a carb cleaner and it is in a spray can and it will decarbon your cylinder it has instructions on the can believe me it works.I had a Ford ranger pickup bought it brand new and broke it in on AMACO 93 octane because my dad sold that gas I would buy from another place and cheaper grade gas and lower octane on a hill the valves would rattle and sound like a diesel .I would go the cheapest route before pulling that right valve cover off just fuel for thought. Take care and may God bless.
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post #8 of 9 (permalink) Old 10-19-2011, 02:12 PM Thread Starter
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thank you for . the suggestions, will give them a try, semperfi.
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post #9 of 9 (permalink) Old 10-19-2011, 02:23 PM Thread Starter
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thank you, semper7
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