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Front Sproket Chewing Plastic

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Guys,

I just bought a 07 S last weekend and I have put less than 130 miles on it so far. Ocasionally when I let off the throttle I hear a strange noise from the front sprocket area. I tightened the chain slightly to the reccomended slack and I can still hear the noise sometimes. I removed the sprocket cover and noticed that the sprocket has chewed into the chain guide plastic on the front of the swing arm.

Is the noise I'm hearing normal?

Is the chewed up plastic normal?

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Are you sure your chain isnt too tight, if the chain wont touch the rear edge of the chain top slider, its probably too tight. Secondly check your chain trueness on the teeth and ensure the chain is not running to one side.

the chain links should be pressing into the plastic noise sprocket cushion , but if the plastic is coming apart thats not normal.

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I would also suggest you confirm the wheel is aligned. When I got my SM, the rear wheel alighnmnt was off by almost 1/4", causing the chain to be askew and wear the inside of the CS a lot.

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I have an 07 400S too, it is not normal. If there is damage that you can not live with, take it bake to the dealer and have them fix it. You did not change the sprocket out to a 16 tooth did you? I could see that being a problem as tight as a fit it is, but people hear have done it without a problem. You should have a 15 stock. Sounds like the way you are describing, that it is the chain guide that wraps around the swing arm that is getting torn up, am I right?

Part 16

http://houseofmotorcycles.bikebandit.com/partsbandit/oem_schematic_view~schem_dept_id~2364194~section_dept_id~1~section_dept_name~OEM+%28Stock%29+Parts~dept_type_id~2~model_dept_year~2007~model_dept_mfr~Suzuki~model_dept_id~2364148~model_dept_name~DR+Z400S.asp

Check to see if it is a bit twisted or if something is under the guide. I would not imagine that tightening your chain would affect the clearance between the guide and sprocket. If it is, wow, that chain is too tight. :ride:

While you are looking into this, take some time to read up and do the CS Nut/Sprocket Locktite fix.

Bad Stories:

http://www.thumpertalk.com/forum/showthread.php?t=459407&highlight=CS+Nut

http://www.thumpertalk.com/forum/showthread.php?t=419473&highlight=CS+Nut

CS Nut vs Pri Nut

http://www.thumpertalk.com/forum/showthread.php?t=451552&highlight=CS+Nut

Hope you get it taken care of fast, so your grin factor comes back after your rides. :censored:

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Thanks for the input guys! Fortunately the weather is pretty crappy here so I'm not missing out on any riding. When I tightened the chain I did it by the book. The bike is bone stock (other than the TT case guards). I have the day off tomorrow and I'm going to head back to the dealer and have them take a look at it; I'll let you all know what the outcome is.

JC

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