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Re: How do I change trans fluid on a 2005 1200 sportster.
The sporster shares fluid with the primary and tranny. There is a drain plug basicly behind the kickstand. It takes 1 quart of gear lube, I use Mobile 1 90 weight.
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The trans lube is the same as the primary lube. As long as the primary fluid is touching the bottom of the clutch basket with the bike sitting upright, you are good. You will have to remove the clutch (derby) cover on the primary cover to check the oil level.
Harley-Davidson Sport Trans fluid or equilivant. Now, there are several aftermarket makers of this oil. It is different from the oil used in the Big Twin clutch cover because in the Big Twin, the oil only lubricates the chain and the clutch. In a Sportster, the oil also is the transmission lubricant so it has to have the proper shear resistance and high pressure lubricant additives in it. Custom Chrome, V-Twin, Motor Factory, and many others make this lubricant. Order it through your motorcycle shop.
Old fluid or improper type. Doesn't the Sporty use the SportTrans fluid in the year? Other than that, maybe time for new clutch plates. Or the clutch spring may have lost it's spring.
Take off the Derby cover, the fluid should come to just below the bottom lip. I change mine every other oil change. Be very careful with the O-ring seal on the derby cove it can be a pain to seat properly and will pinch and leak if your not careful. I use a little vaseline to seat the O-ring
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