Starter clutch problem

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barney01
Posts: 2416
Joined: Wed Sep 26, 2012 7:33 pm
Location: Prestatyn.Wales

Re: Starter clutch problem

Postby barney01 » Sun May 07, 2017 6:55 am

As you described, to remove clutch cover. I think whatever happens you are going to inspect the starter clutch. It does sound like the screw problem. The clunk is the screws hitting the crankcase and the whining is the starter disengaged spinning on its own. Here is all the info on the 'L' model. https://www.oldjapanesebikes.com//mraxl ... les/page-8 .
Colours especialy the red can fade into a colour thats looks orange.
You may be able to identify the bike better here http://www.ozebook.com/compendium/suzi/ ... engnos.htm
Here is a comparison photo of the two starter clutches. New style left, old style right. You can see the three screws holding the drive gear that may have worked loose.
Attachments
gt550_starter_clutch.JPG
Picture courtesy of OJB
NO SMOKE .......NO POKE

stinkywheels
Posts: 19
Joined: Thu May 02, 2013 9:25 pm
Location: Sutton Coldfield, West Midlands

Starter clutch problem

Postby stinkywheels » Sat Jun 08, 2019 10:13 am

Hi all.
Really appreciate some help and guidance. I have a GT 550a with the Borg Warner starter clutch which intermittently engages on the starter button. I have released the retaining clip and strip the assembly down and noticed that a the spring strip on one of the pawl roller retaining cage was bent. I shaped this back to the same geometry as all the others and re assembled. Problem still exists. Other than this detail I can see nothing obvious which would explain why it intermittently engages. How important is the shape of that spring strip which is only a few thou' thick? Is there any one who repairs these or at least can somebody in the forum give me some detailed pointers what the cause could be and the right remedy.

Also what brand and grade of transmission oil is best to give the starter clutch best chance??
Cheers
Paul.

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Alan H
Posts: 9266
Joined: Fri Aug 05, 2011 6:38 am
Location: Wombwell, Republic of South Yorkshire

Re: Starter clutch problem

Postby Alan H » Sat Jun 08, 2019 10:29 am

stinkywheels wrote:Hi all.
Really appreciate some help and guidance. I have a GT 550a with the Borg Warner starter clutch which intermittently engages on the starter button. I have released the retaining clip and strip the assembly down and noticed that a the spring strip on one of the pawl roller retaining cage was bent. I shaped this back to the same geometry as all the others and re assembled. Problem still exists. Other than this detail I can see nothing obvious which would explain why it intermittently engages. How important is the shape of that spring strip which is only a few thou' thick? Is there any one who repairs these or at least can somebody in the forum give me some detailed pointers what the cause could be and the right remedy.

Also what brand and grade of transmission oil is best to give the starter clutch best chance??
Cheers
Paul.

If you use semi or full synthetic oil in the gearbox, both starter clutch and 'full' clutch will slip. 14w40 or 20w50 full mineral must be used.
The 'teeth' on the Borg warner bit wear slightly over the years - especially if the oil level ever gets low - and replacement is the only option. I posted about these some time ago, here - viewtopic.php?f=16&t=5620&hilit=borg+warner&start=220 - last two posts on this page and the next ones on the next - during my last 550 resto. They can't be repaired, and have to be replaced. Reiner is the only one that has any as far as I know, but read the bumf first!! It intermittently engages 'because that's what they do' mine's the same, and if the engine fires - even a tiny bit, it kicks the starter clutch out, as it should do. I think they just get tired, but getting spares is hens teeth territory.
Proof that four strokes are over complicated

barney01
Posts: 2416
Joined: Wed Sep 26, 2012 7:33 pm
Location: Prestatyn.Wales

Re: Starter clutch problem

Postby barney01 » Sat Jun 08, 2019 11:09 am

+1 with Alan. I have had my 550 for 25 years and have checked and replaced everything including the one way clutch bearing you refer to. Mine has the Borg Warner too. TBH I just kickstart it and only use the SM when the engine is warm. It seems some bikes never have problems and some do :roll:
NO SMOKE .......NO POKE

stinkywheels
Posts: 19
Joined: Thu May 02, 2013 9:25 pm
Location: Sutton Coldfield, West Midlands

Re: Starter clutch problem

Postby stinkywheels » Sat Jun 08, 2019 11:22 am

Morning Alan
Thanks for response. I have used a semi synthetic transmission oil so this could be the culprit. I will put in 20/50fully mineral and hopefully happy days. Our local bike shop does not stock fully mineral - where do you buy yours from?
Do you have Reiners contact details?

In the threads it mentioned that there are two versions of the BW clutch - what are the differences if I am lucky mine might be the later one.

Cheers
Paul

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Alan H
Posts: 9266
Joined: Fri Aug 05, 2011 6:38 am
Location: Wombwell, Republic of South Yorkshire

Re: Starter clutch problem

Postby Alan H » Sat Jun 08, 2019 11:40 am

Local car spares shop. Modern bike shops just don't understand...... :roll:
Differences are width - can't remember offhand, but they may be on the thread link I posted.

gtreiner1@AOL.com
Just ask for a current price list plus details of borg warner parts for GT550.
Proof that four strokes are over complicated

barney01
Posts: 2416
Joined: Wed Sep 26, 2012 7:33 pm
Location: Prestatyn.Wales

Re: Starter clutch problem

Postby barney01 » Sat Jun 08, 2019 11:50 am

Wilko and Halfords also sell 20/50 classic oil if I were you I would get an engine flush too as you really need to make sure all that synthetic is out
This is what I use
https://www.carparts4less.co.uk/cp4l/p/ ... oCzyTw_wcB
Last edited by barney01 on Sat Jun 08, 2019 11:57 am, edited 1 time in total.
NO SMOKE .......NO POKE

stinkywheels
Posts: 19
Joined: Thu May 02, 2013 9:25 pm
Location: Sutton Coldfield, West Midlands

Re: Starter clutch problem

Postby stinkywheels » Sat Jun 08, 2019 11:52 am

Hi Alan
Thanks again. I let you know how it goes
Cheers
Paul

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Alan H
Posts: 9266
Joined: Fri Aug 05, 2011 6:38 am
Location: Wombwell, Republic of South Yorkshire

Re: Starter clutch problem

Postby Alan H » Sat Jun 08, 2019 12:00 pm

While you've got the clutch in bits, wash everything in thinners or paraffin to get rid of the semi synth stuff, then refill with mineral. Run for a day or 2, then empty and refill as Barney suggests.
These old ladies (the bikes!) were designed in the 60s/70s so in the main, use lubricating products from that age for 'rubbing' parts like clutches.
Saying that, semi synth 2 stroke oil is better than the old stuff, and smokes less too.
Proof that four strokes are over complicated

stinkywheels
Posts: 19
Joined: Thu May 02, 2013 9:25 pm
Location: Sutton Coldfield, West Midlands

Re: Starter clutch problem

Postby stinkywheels » Sun Jun 16, 2019 7:41 pm

Hi All
Tried Renier for a new starter bearing but can only supply the wider bearing = 15.7mm. Mine is 13mm wide (A Model). Does anybody know who may stock the thinner bearing or is their another motorcycle which uses an identical 13mm wide. Can anything been done to improve the grip of the roller bearings when operated by CF.

Cheers
Paul


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