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I get this weird grinding noise when I let out the clutch sometimes

  • DT400FRANK
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I'm not sure if it's the clutch slipping or maybe the clutch pusher rod. It does not do it all the time but it's like a growl that I can feel.
14 Jun 2021 19:52 #1

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Are you hungry when it happens?
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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14 Jun 2021 19:55 #2

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I had that all the time on my DT250D if i did hard starts but maybe not so hard either. Clutch didn't slip so i never went looking & got a hard time in the forest at times too. Thought maybe the plates just vibrating taking up the drive till fully gripped. Might be hard friction material not gripping until fully together. I guess it doesn't slip? & frees up good when stopped in gear.
14 Jun 2021 20:50 #3

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  • DT400FRANK
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Yes Mark I was hungry so I ate a burito and then it started making a different noise. :o

I might have felt it chatter in top of of a few gears also like 3rd and 4th gear. I'm going to be putting some Lucas 20w 50w full sythetic designed for wet clutches and see if that cures it. 
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Last edit: 14 Jun 2021 22:24 by DT400FRANK.
14 Jun 2021 22:20 #4

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Might be different to mine as by memory it was just doing a hard revving start off from stand still although clutching it through deep stuff in the forest enduro i recall it now thinking back. Was 20+ years ago. Mind you i don't use the clutch unless i have to--only in first to take off.--did i say that, rough b-stard.
15 Jun 2021 02:46 #5

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Also take a look at the front sprocket... the one that the drive chain runs on.  Post a picture if you can. 
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
15 Jun 2021 05:46 #6

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perhaps there are wear lines/grooves on the basket edges that the friction plates bear up and slide against?
15 Jun 2021 07:57 #7

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My guess without knowing history of bike is front sprocket has worn out and front sprocket is slipping in chain. 

Happened to a member here on one of our rides at Hungry Valley.  We never did figure it out...  everybody thought it had to be the clutch.  He found the actual problem when he got home.  I've also heard/seen a worn/slipping front sprocket about 3 other times from other members on the forum here. 
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
15 Jun 2021 09:52 #8

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  • DT400FRANK
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It's not the sprockets. I realy believe its clutch chatter like its slipping. I'm going to pull the clutch cover and investigate. It may just be the oil that's in it. But I'm pretty sure its Going to  be in the clutch basket or maybe even the push rod.
15 Jun 2021 12:29 #9

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It would be the front sprocket.  The rear sprocket may look perfect.  So if you haven't actually looked at it you might pull the sprocket cover and look at it. 
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
15 Jun 2021 13:19 #10

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