changing chain and sprockets...pitfalls? - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 31 (permalink) Old 07-20-2019, 09:14 PM Thread Starter
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changing chain and sprockets...pitfalls?

hello gents (and gentleladies, if there are any on this forum),

finally got my parts in the mail and i'm ready to tackle my chain and sprocket change. went to a 520 conversion kit from sprocket center with an 18t front. i have the haynes manual, and i've watched both delboy's youtube tutorial and paul's video as well and it seems pretty straight forward. just wanted to see if there are any pitfalls or surprises i should expect. or if there are any suggestions, advice to make it go more smoothly. my primary concerns are getting that front sprocket nut off, and riveting the master links on the chain, as i don't have a rivet tool. was thinking of getting that $15 chain breaker from harbor freight that ppl have claimed to use to rivet as well, or should i try to get a dedicated rivet tool OR do the old school way. any experience and feedback would be greatly appreciated. thanks!
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post #2 of 31 (permalink) Old 07-20-2019, 09:48 PM
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Don't bother with the cheap chain rivet tools. The rivet pins on my chain were far harder than the rivet tool. Ended up using a block of steel as an anvil and an engineers hammer.

The sprocket, I used a 36mm? socket and a rattle gun. Have done it with a socket and a long handle ratchet using the back brake to stop the sprocket turning (before removing the chain) but it's a bit fiddly unless you have an assistant. It can also be hard to undo a tight sprocket nut this way as the cush drive absorbs the movement as you try to break the nut free.

I don't like the idea on putting it in gear to lock the sprocket shaft but maybe that's just me.
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post #3 of 31 (permalink) Old 07-20-2019, 10:26 PM
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It's a good opportunity to get a impact wrench for sure. It's tough to get the right torque on that front sprocket but, let alone remove it. Although sometimes it just bought falls off, I've had my finger tight. Thank God for that lock washer.

I have a motion pro chain tool. Only advice is if you have one of those is the have an extra 4 mm breaking pin on hand. The piece that pushes the pin out on removal. It breaks itself took easy. Or better yet, have an angle grinder and a cutoff disk, just cut the thing off. It rivets the master link on installation pretty well, but it does take time.
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post #4 of 31 (permalink) Old 07-21-2019, 12:35 AM
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I'd suggest buying a decent rivet tool, once you've got it, you'll always have it.
Grind rivets flush then push them out with the tool.
Make sure you undo the front sprocket nut before you remove the chain :-).
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post #5 of 31 (permalink) Old 07-21-2019, 11:07 AM
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You need the rivet tool, and you'll need to grind off the head of one pin to remove the old chain. Don't attempt to push out the pin without grinding off the head, it probably will not go well. Use a Dremel with a grinding stone, a drill with a grinding stone, or any other way that you can think of. Wear safety glasses at least for this part of the process. It will only take a few minutes.

The total width of the link should stay the same as the other links. I expanded the rivet to 0.4mm over its baseline, using a digital caliper to make the measurement (which might be overkill, but I had the caliper and I was making photos for a how-to). See the following for the entire process, hopefully the pictures will show up.

https://www.triumphrat.net/air-coole...-pictures.html
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Last edited by Baltobonneville; 07-21-2019 at 11:19 AM.
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post #6 of 31 (permalink) Old 07-21-2019, 01:09 PM Thread Starter
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great thanks guys
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post #7 of 31 (permalink) Old 07-22-2019, 03:19 AM
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the front sprocket nut is meant to torqued up to 132 Nm (98 ft/lb). this is way overkill and just makes getting it off in the future very difficult. I always tighten mine to about 80 Nm with no issues
and may pay to get a new tab washer for the nut part number T1180181

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post #8 of 31 (permalink) Old 07-22-2019, 07:42 AM
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By an Electric Impact. I use it to remove and install these nuts all the time. For removing the old chain use an angle grinder...faster..cheaper and easier then any pin tool...the old chain is garbage anyway. Invest in a good rivet tool. A little on the loose side..is a better then a little on the tight side.

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post #9 of 31 (permalink) Old 07-22-2019, 09:02 AM
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Osmosis,

Hey, Just a side note. Take off sidecover and have someone hold brake. Hopefully a beautiful woman and break the nut loose, before dropping the chain. Makes it alot easier. Don't ask How I know.

good luck

Dan
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post #10 of 31 (permalink) Old 07-22-2019, 08:10 PM
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Quote:
Originally Posted by danr620 View Post
Osmosis,

Hey, Just a side note. Take off sidecover and have someone hold brake. Hopefully a beautiful woman and break the nut loose, before dropping the chain. Makes it alot easier. Don't ask How I know.

good luck

Dan
Yes to this, for sure. Use a breaker bar with your 36mm socket, not your ratchet.

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