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Chain Slipping Ghost Shifting Accushift Problem

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Chain Slipping Ghost Shifting Accushift Problem

Old 10-13-17, 09:31 PM
  #1  
boneshaker78
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Chain Slipping Ghost Shifting Accushift Problem

Having an issue where my chain is slipping or ghost shifting when I'm on the middle cogs of my 6 speed Suntour freewheel. To be more specific, it is doing this on the 2nd, 3rd and 4th cogs, if you were to start counting from the smallest cog.

The bike is a Miyata 618GT with Suntour Accushift bar end shifters, Suntour XCM derailleurs. I replaced the old chain because it was worn badly (I do not have the old one, threw it away). Everything else, besides the cartridge bottom bracket and fresh derailleur cables are original to the bike. Everything appeared to be in good condition, no noticeable extreme wear or anything like that.

The rear derailleur seemed to be out of alignment with the cogs, so I bought a NOS Suntour XCD 6 speed accushift rear derailleur. When checking the XCM derailleur I noticed what seemed to be an excessive amount of play where the lower knuckle meets the cage and assumed this was the issue. When I received the XCD, I checked to see if it too had the same amount of play, it appears that it does. I have not mounted the XCD derailleur as of yet but I might tomorrow. I'm beginning to think it may not be the derailleur.

I tried a few different things, moved the wheel back in the dropouts, adjusted the tension on the cable, shortened the chain a bit, greased the cable where it contacts the plastic guide under the bottom bracket shell... nothing is working so far, no change. I'm guessing it may have been a bad idea to change the chain and not the freewheel, the chain is a KMC x8.99 (with x bridge outer plate). I just find it strange that it is only slipping on the middle cogs.

Never had this problem before, seems to be a real trouble shooting, time consuming headache.
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Old 10-13-17, 11:32 PM
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Derailleur hanger is bent inwards.... might be twisted too...

straighten the hanger.... report back after resetting the screws/cable.

and i'd switch to a Z51 chain... more "period correct" in design.... better match to the age of the drive train... and more forgiving of worn ders. typically...

if you will... pull the rear wheel... post a "straight at the axle" image of the freewheel, please... might be worn, and that will explain the skipping...
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Old 10-14-17, 06:48 AM
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dsbrantjr
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If your chain was badly worn as you state, the freewheel cogs may be worn as well and it may not play well with a new chain and the freewheel may need to be replaced also. As maddog34 states the derailleur and its hanger alignment should also be checked.
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Old 10-14-17, 07:04 AM
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I agree with both of you. I'm going to try a new chain first, I want to find the cheapest solution possible. Here are the pictures of the freewheel, I agree that it is probably worn, or worn with the stretched chain anyway. My understanding is that it can be difficult to tell whether a freewheel is worn or not.
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Old 10-14-17, 07:31 AM
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Originally Posted by boneshaker78 View Post
My understanding is that it can be difficult to tell whether a freewheel is worn or not.
It is difficult to tell by eye; the best way is to put on a new chain and see if it skips.
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Old 10-14-17, 08:18 AM
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Agree with the others plus accushift was never that great to begin with. I just run mine in friction.
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Old 10-14-17, 08:39 AM
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Accushift is just like that.
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Old 10-14-17, 09:36 AM
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I had an old Shimano 6 speed indexing freewheel laying around. I threw it on just for kicks and it works just fine. It was definitely the freewheel that was causing the chain skipping/slipping/ghost shifting issue. I donít understand why people say there is no way you can mesh this Accushift stuff with Shimano.... seems fine. Shifts as well, if not better than before. The best part is that if I stand up to climb a hill or something my chain wonít be slipping off.
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Old 10-14-17, 11:54 AM
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Originally Posted by boneshaker78 View Post
I had an old Shimano 6 speed indexing freewheel laying around. I threw it on just for kicks and it works just fine. It was definitely the freewheel that was causing the chain skipping/slipping/ghost shifting issue. I don’t understand why people say there is no way you can mesh this Accushift stuff with Shimano.... seems fine. Shifts as well, if not better than before. The best part is that if I stand up to climb a hill or something my chain won’t be slipping off.
I am running a modern Shimano 6 speed freewheel with a Suntour Superbe Pro RD and matching Suntour downtube shifters. Works well, not perfect. In my case, its either spend a lot of money on a NOS Suntour freewheel, or try a modern cheap Shimano freewheel. So I gave it a try. Of course, I could just ditch the Suntour components as well, but I was not interested in doing that.
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Old 10-14-17, 12:14 PM
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I concur. I love vintage Suntour and didnít want to sacrifice my group which is in very good condition. NOS Suntour freewheel that matches mine exactly is on eBay right now, buy it now 135 bucks... no way.
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Old 10-14-17, 12:29 PM
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as i stated above... the der. hanger is bent... glad it works better with the different freewheel, but you do want to get that hanger straightened.

and i love Suntour too... i run a Suntour Cyclone RD on my '82 Trek, with Suntour bar end friction shifters... both have been replaced due to decades of use/wear/crashes...

get that hanger straightened.

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Old 10-14-17, 12:56 PM
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Originally Posted by boneshaker78 View Post
I had an old Shimano 6 speed indexing freewheel laying around. I threw it on just for kicks and it works just fine. It was definitely the freewheel that was causing the chain skipping/slipping/ghost shifting issue. I donít understand why people say there is no way you can mesh this Accushift stuff with Shimano.... seems fine. Shifts as well, if not better than before. The best part is that if I stand up to climb a hill or something my chain wonít be slipping off.
I agree - Suntour Accushift and Shimano can work together well. I have an old mountain bike with &-speed Accushift shifters, a Shimano Deore shifter, Sachs Maillard freewheel, and Sram chain. It shifts perfectly.
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