Odd vibrations and rough riding in mexico

Cylinder head, Barrel, Gearbox, Crank
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scottieh
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Odd vibrations and rough riding in mexico

Post by scottieh » Tue Nov 21, 2017 2:27 am

So I'm out here in the middle of Mexico and my xt600 is starting to exhibit some symptoms of rough riding. I'm aware of the 5th gears in the gearbox sometimes wearing faster than the others but I'm feeling the roughness in all of the gears. I also notice that moving from a stop can be really hard on the clutch. I replaced the clutch two years ago and have ridden about 15,000 miles since then. The problem is mostly noticeable with my touring gear packed on, adding an extra 150 pounds more or less. I can't say it's like a clunk moving forward from stop but the engagement of the gears is hard feeling.

So, what i know right now isnt much but i have a rough ride at all gears and a clutch that isn't smooth. I've never replaced the bottom end bearings and i shudder to think of doing it considering my luck with flywheels. I'll be pulling the clutch side cover to measure the plates and see if somehow the clutch has worn out already. I'll also wiggle around the big ends and feel for any play in the bearings as well as look for pitting on the visible gears.

Any other suggestions are welcome. My girlfriend's xt600 is nearly identical excepting the mismatched muffler and it feels like a completely different motorcycle. Smooth, less vibration, and quiet (that's the muffler though).

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Mezo
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Re: Odd vibrations and rough riding in mexico

Post by Mezo » Tue Nov 21, 2017 2:52 am

Does your bike have cush drive Scottie? could be worn out.

Image

Also check your chain tension with all the extra weight on board, it could be to tight.

EDIT: Plonk the missus on the bike fully loaded & check the tension.

Mezo.

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scottieh
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Joined: Wed Mar 30, 2011 3:58 am
What Bike or Bikes Do You Own?: 1988 XT600Z 3AJ
1985 XT 600
Previously Owned Bikes: 1989 Yamaha Virago 750
1994 DR650
1980 Suzuki GR650
1997 KLR 250
1986 Honda Spree
Location: ATX, USA

Re: Odd vibrations and rough riding in mexico

Post by scottieh » Tue Nov 28, 2017 4:40 am

Now that the bike is together i checked the chain tension and it's fine. The cush drive is still good too. Hoping to pull the clutch tomorrow and measure the plate thickness. I bought a clutch kit on this trip but didn't expect to use it. Hope it's an easy fix. Fingers crossed

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scottieh
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Posts: 439
Joined: Wed Mar 30, 2011 3:58 am
What Bike or Bikes Do You Own?: 1988 XT600Z 3AJ
1985 XT 600
Previously Owned Bikes: 1989 Yamaha Virago 750
1994 DR650
1980 Suzuki GR650
1997 KLR 250
1986 Honda Spree
Location: ATX, USA

Re: Odd vibrations and rough riding in mexico

Post by scottieh » Wed Nov 29, 2017 12:47 am

Replaced the clutch and that sorted out the issues with starting from a stop. Clutch plates weren't dead but they weren't new either.

Image

I still feel odd vibrations when the bike is driving in gear. Something way down low in the engine i guess. When i pull in the clutch and coast the sensation goes away so i know it isn't tires or chain. The gears behind the clutch basket looked good. Hope it keeps riding!

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Mezo
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Re: Odd vibrations and rough riding in mexico

Post by Mezo » Wed Nov 29, 2017 1:07 am

Don`t forget to soak your new plates overnight in oil before installation, what oil are you using? semi synthetic?

Mezo.

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scottieh
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What Bike or Bikes Do You Own?: 1988 XT600Z 3AJ
1985 XT 600
Previously Owned Bikes: 1989 Yamaha Virago 750
1994 DR650
1980 Suzuki GR650
1997 KLR 250
1986 Honda Spree
Location: ATX, USA

Re: Odd vibrations and rough riding in mexico

Post by scottieh » Wed Nov 29, 2017 3:35 pm

I wish it was semi synthetic. My choices for 10w-40 oil have greatly diminshed since entering Mexico. Currently using valvoline 10w40 and always on the search for semi-synthetic.

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Mezo
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Re: Odd vibrations and rough riding in mexico

Post by Mezo » Thu Nov 30, 2017 4:43 am

Seems you have vernier`s to hand also check the clutch springs are in spec, did it feel like it was slipping pulling away from start?

Mezo.

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scottieh
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Joined: Wed Mar 30, 2011 3:58 am
What Bike or Bikes Do You Own?: 1988 XT600Z 3AJ
1985 XT 600
Previously Owned Bikes: 1989 Yamaha Virago 750
1994 DR650
1980 Suzuki GR650
1997 KLR 250
1986 Honda Spree
Location: ATX, USA

Re: Odd vibrations and rough riding in mexico

Post by scottieh » Sun Dec 03, 2017 11:20 pm

No slippage, just a hard thunk getting going. I have extra springs laying about but i think sharah's bike is going to get those when the new clutch kit arrives from the states. My parents come to visit in a few days and they are bringing down a bunch of spare parts including a used original tank to replace the plastic Clarke tank with a hole in it. I've plugged the Clarke tank with a stick and some gasket sealer and it only weeps now but a proper tank would be great.

In case anybody is interested the Clarke tanks are manufactured using crosslink polyethylene. Here is the formula

PE SST 200 XL

That could be useful if somebody wanted to plastic weld their clarke tank and needed a specific kind of filler rod.

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Mezo
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Re: Odd vibrations and rough riding in mexico

Post by Mezo » Mon Dec 04, 2017 6:10 am

Have you checked the counterbalance nut is tight? could be a worn keyway, im sure you must have read the various threads on the subject? if you don`t catch it early its toast for the engine (it will destroy the engine) some people have caught it in time others have not.

Mezo.

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