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Need advice on replacing the header sprocket on a XR650R!!

  • XRArin
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Hi all!

I need to replace this rusty old sprocket and need advice on how I can remove it.

I've attached a picture below to show what it looks like. I have lots of tools so let me know what it will require.


Any advice will be appreciated!!!!




Arin
25 Feb 2021 14:32 #1

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Hi just undo the 2 x 6mm bolts (10mm spanner) then rotate the keeper plate slightly and it will come off....pull sprocket off and replace with either a 14 or 15 tooth as required....they do a 13 but 14 was stock gearing 14~48
Refitting in reverse but I always put some copper slip on the splines.
Yamaha RT2 360 ~ Honda XR650R ~ Yamaha DT175MX ~ Kawasaki KH400 ~ GPz550

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25 Feb 2021 14:41 #2

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Exactly what Mauser said...  I'd add that brushing some rust off with a wire brush first might be helpful.
Also, you might check the chain alignment...  wear pattern on side of sprocket might be due to rear wheel offset a little or cocked a little crooked in swing arm...
Sometimes the axle alignment hash marks on swingarm aren't accurate.

 
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
25 Feb 2021 17:25 #3

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Hi Mauser,

Thank you for the advise!! Like I said, I have plenty of tools to get it off, its just a matter of NOT trying to break the shaft that goes into the motor. 

I will attempt to get it off carefully and will have an updated picture of the new sprocket put on. I think the new one I have is a 14 or 15 tooth. I happen to have a wire brush as mark T recommended for cleaning off some rust. I don't know how that rust spread into something major overtime...

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Do you guys suggest that I have that plate that attaches/bolt on the sprocket replaced????? They do make parts for them!!!


Arin




 
25 Feb 2021 18:03 #4

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Hi Mark,

Do you suggest that I can replace the rusty plate that holds on the sprocket since its all rusty/corroded?? I will try to clean some of it off tomorow if I can.

Yes the swing arm has some marks on them and like you said, they are not that accurate unfortunately. 



Arin
25 Feb 2021 18:08 #5

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Arin, you should be able to just clean it up and check for wear, cracks or just bad.
Then replace it if necessary. Clean it up good.
26 Feb 2021 10:37 #6

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Shouldn't need to replace the plate, I use a brass brush it's less harsh the a wire brush but once it's clean it shouldn't really get rusty after all you are lubricating the chain regularly ?. Whilst we talking chains please please please make sure your chain is a decent quality and perfect condition, if it breaks a chain it will take out the engine casing's sprocket cover lug or even worse the left crank case which will be a disaster.
We make case savers for the 650R just for this reason....
www.xr650r.co.uk/newparts/casesavers/casesavers.shtml
Be warned and get a DID 520 chain with master link and keep it correctly tightened and lubricated.
Yamaha RT2 360 ~ Honda XR650R ~ Yamaha DT175MX ~ Kawasaki KH400 ~ GPz550

26 Feb 2021 12:52 #7

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Yes, replacing only sprockets is usually false economy...  chain and sprockets should be replaced as a set. 
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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26 Feb 2021 12:58 #8

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  • XRArin
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Hi Mauser,

I am replacing everything. The 2 sprockets and the chain. I bought the best o-ring chain for the bike according to what the dealer and internet said. Its a DID o-ring chain I think? I will check and keep you guys updated. 

By the way, I did manage to take off the sprocket and replace it with a brand new one no problem!!

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By the end of next week, I will post pictures of the bike all finished and ready. It would be nice to bring it to Gorman in the future with Dave Meis and the rest of the group!!

I do keep my chain lubricated at all times!! Every time I go out, I alweays check the chain tension and make sure its at the correct tension. Not too tight, not too loose, just right! 


Arin
26 Feb 2021 20:54 #9

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Hi Mark,

I am replacing everything! both sprockets and a brand new DID chain for the bike. It is always a good idea to do so if anyone replaces a sprocket or two. 


I did manage to take off the header sprocket without any issues thanks to your guys' advice!! I'm glad I can ask a question on here if I needed any help or advice about fixing or maintaining my bike

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Arin
26 Feb 2021 20:59 #10

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