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Old 08-01-2014, 03:33 PM   #1
Effisland OP
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Eh? Removing front sprocket with puller - arrg

Hey maybe past front sprockets just slid off, this one seems like it's rust-welded in and the puller doesn't look like it could handle much more cranking. I'ts in first gear and turning over when I give er.

F800GS - maybe this is common. Any hints - just keep cranking the MF?!
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Old 08-01-2014, 03:36 PM   #2
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Heat the sprocket.
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Old 08-01-2014, 03:51 PM   #3
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Heat the sprocket.
+1. There is thread lock on it and heat will help it break loose.
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Old 08-01-2014, 09:19 PM   #4
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+1. There is thread lock on it and heat will help it break loose.
hmm no torch. would a simple propane torch get it hot enough? Cheap(er) than real torch
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Old 08-02-2014, 02:27 AM   #5
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hmm no torch. would a simple propane torch get it hot enough? Cheap(er) than real torch
propane torch will work fine. you don't need to MELT IT! just warm it up enuf to break the thread lock...
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Old 08-02-2014, 05:27 AM   #6
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hmm no torch. would a simple propane torch get it hot enough? Cheap(er) than real torch
be careful the deflected flame doesn't melt/burn any adjacent plastic/wiring/seals. the flame can be hard to see in daylight, watch for smoke/shrivelling
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Old 08-02-2014, 03:10 PM   #7
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What does this heating do to the oil seal?? I thought so! So much for internet advise!
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Old 08-02-2014, 03:21 PM   #8
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What does this heating do to the oil seal?? I thought so! So much for internet advise!
Soooo, exactly HOW would YOU remove it??

If you heat the sprocket just enough so it will loosen the thread lock (you do not need to heat the shaft) the oil seal will be fine.
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Old 08-02-2014, 09:18 PM   #9
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I have seen the odd sprocket that has to be turned on the splines before the splines line up to remove it.
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Old 08-03-2014, 07:38 PM   #10
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What does this heating do to the oil seal?? I thought so! So much for internet advise!
The oil seal isn't in the picture at that stage, since it stays in the timing cover, which is now sitting on the bench Mr smartypants!
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Old 08-03-2014, 07:42 PM   #11
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Oops, I was thinking I was in Airheads. I have no input on an F800, sorry about that.
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Old 08-05-2014, 10:17 PM   #12
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Sheared bolt ...

So I heated with the propane torch. was unsure whether to heat also the inner part. Now I know I didn't blast it enough. It started smoking, but that would be normal. I let the garage clear once I opened the door then went in too fast with the puller. Arrg! She is on there tight. I am unsure how it will fly off or which eye it will take out if I try to dismantle it. Oh yes it is an American product - but made in China - a fact likely ignored by the parts distributor, who ironically, is probably an anti-communist, and will likely also not replace this sad P.O.S. once I figure out how to beat this potential ball-breaker. I had my 30" 1/2" Torque Wrench...preset at some high setting so it wouldn't slip. Mantra, never complain, never explain, fail.
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Old 08-05-2014, 10:28 PM   #13
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I have seen the odd sprocket that has to be turned on the splines before the splines line up to remove it.
I am hoping this is not the case. how do you determine this?
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Old 08-06-2014, 06:43 AM   #14
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This shouldn't be that difficult! My origianl factory sprocket came off easily without a puller...

Just heating the sprocket, not the shaft, should cause the metal to expand and the thread-lock to soften....

I am left to wonder: sounds like you have an aftermarket sprocket- who installed it and what did they use for thread-lock????

I suppose you could use a cutoff wheel to get it off of there, but you'd need to be careful re: control and possible overheating, and setting the garage on fire....
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Old 08-06-2014, 06:59 AM   #15
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What does this heating do to the oil seal?? I thought so! So much for internet advise!
I've used torches on a few bikes with oil seals that were right there...

it helps to wrap a wet rag around (and stuff behind if possible) the sprocket. when the rag smokes, pull the torch off and spray the junction with pbblaster. stinks like death, but the puller is barely needed afterwords.

heat pulls the penetrant into the splines, breaks the rust, and kills the loctite, all at once.

... but I'm just another guy on the interwebs.
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