Bought the bike used, all stock with the exception of after market exhaust. When I get on the throttle no matter what gear I'm in, I hear a metal rattle sound. It's very faint and difficult at this point to narrow down. I sounds something like if yo were to put a ring onto a metal rod that was just barely smaller than the ring and shake the rod while the ring rattled. Just curious on what it might be or how to narrow it down and fix it before the small problem becomes big. Thanks
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Re: When I get on the throttle I hear a rattle sound
I would guess by the sound of that that the fueling is all up the ***,,the sound you are hearing is commonly known as pinking which is caused by an overly lean combustion mix,the fuel is actually igniting before the sparkplug fires(it ignites just by the build up of heat in the cylinder)get the reason the fuel mix is so lean is you guessed it (the aftermarket pipe),get the bike into the agent and get the fuelling sorted before it starts burning holes through the piston(and it wont be a matter of if it will be when)hope this helps
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Sounds like the actuator is going bad not allowing it to cycle. The STB butterflies are on one long pin check to see where they connect at bothe ends if the housing is worn out. Awhole new set (at least for mine) could run up to $2k.. You could buy a whole used unit from ebay for around $100 (go figure on the price difference). OR, You could just remove the STB's alltogether. You will lose a little mid torque but more air in the high rpms, racers do this on every bike. Just have your pcm reprogramed to compensate
A lot of after-market mufflers don't cover up a backfire pop on over-run in the way that the stock system does. Look at The Marble Mod on GIXXER forums for ways to doctor the bike's emissions system to stop the popping.
Another cause of an over-run backfire may be a slight leak where the header pipes emerge from the cylinder head. Check the bolts are tight. Consider new copper washers.
As long as you get a muffler that is comparable to a stock muffler then it will have no effect on the performance. Most aftermarket companies make stock mufflers that would fit your bike though it would likely be cheaper to just replace them with stock kawasaki pipes. As to replacing them, using an impact wrench will make removal easier and be sure to use a new clamp even if the old one looks good
I have seen a few of the R1200C bikes with this rattle.... There is a cat. converter in the exhaust system and it sits between the pipes approx. under the transmission. This is the usual cause of the rattle.
Warm the bike up by riding it around for a while, then stop the engine and use a plastic face or rubber hammer to tap on the exhaust system in the area near the transmission to see if you can hear a rattle or something loose in the exhaust. This should give you some idea where the source of the rattle is.
There is no easy fix for this problem except replacement of the offending parts.
I would take a close look at the valves, if you are sure the carb is entirely clean. (Accelerator pump and everything)
A closed up exhaust can harm an exhaust valve.
Start with a compression test.
Is the plug wet?
It may indicate that but that doesn't mean there's anything wrong with it. If the bike sat for a long time while running, the exhaust can get hot enough to discolor the pipes...but that doesn't mean there's anything wrong with the motor. Improper carburetor settings can make the bike run lean (not enough fuel) which, in turn, can cause a hotter than normal exhaust and discolor the pipes...again, this does not indicate there is anything wrong with the motor. Ask if the pipes are stock or after-market. After-market pipes are a minefield for motorcycle riders. When the manufacturer puts the stock pipes on, they are tuned to the motor to give peak performance which usually results in little to no bluing of the pipes. Aftermarkets can throw the tune off and discoloration is the result. Ask the seller if there have been any changes to the bike...such as after-market pipes, rejetting the carburetor, changing the intake, etc. Most likely the seller will say yes, there have been some changes made. Please note: THIS DOES NOT MEAN THE BIKE IS BAD OR THE ENGINE IS WRONG.
If you can hear your Mikuni carbs "rattling" evidently you have changed the air box on your bike. The stock air box does two things, filter the air going into your engine and quieten intake noise. If you've changed or modified your air box in order to get better performance, you'll have to learn to live with more intake noise. The "rattle" you hear is really not a rattle. It is the "intake pulse" of each piston sucking air into the cylinder. Even at idle speeds, it does this so fast at to make it sound like a rattle. At higher speeds, it's so fast that you can't hear it most of the time. If the bike is idling at 1000 RPM, envision the piston moving up and down in the cylinder 1000 times a minute or 16 times a second. Every other time is an intake stroke, 8 times a second.
Does the bike backfire only when the throttle is being closed? The carbs have a idle enrichment circuit. If the idle enrichment diaphragms are stuck in the closed position, the bike will backfire when the throttle is shut down. You can't remove these parts for cleaning without seperating the two carb bodies (and then needing to synchronize the carbs after reassembly). A trick that worked for me...fresh fuel, and some fuel system cleaner in the tank...ride the bike at highway speeds for 20 -30 minutes...repetedly rev the engine to a high RPM then shut the throttle closed. The repeted application of high engine vaccum to the enrichment diaphragms freed the stuck diaphragms and the fresh fuel cleaned any gum and varnish that caused the trouble. I've put 20,000 miles on it since then with no backfiring.
This sounds like pre-ignition, aka detonation and engine knock. Change to premium gas and put in a set of spark plugs that are one heat range colder than stock. It is good that you are handling this before the engine destroys itself. Yes, destroys itself. That is what pre-ignition will do. By the way, good description!
Congratulations on the new bike, the whine could be the shaft drive, I've heard they can put a out a short duration whine as kind of a protest when there is a forced mismatch between engine and road speed that a quick deceleration can do. At 60 mph plus I'm wishing that there is one more gear to get into, but I don't find the vibration annoying. I think any bike at that speed will have vibration issues in the mirrors, as there is little mass to dampen it out. Its one of the reasons I switched to convex mirrors as I find there is less distortion.