Barcelona Atlas/Zane starter clutch parts...

Yogi

Yogi

Hero member
Location
Bellingen NSW Australia
Went to start the Barcelona the other day and it would not engage - just whirring noise from starter.  The bike was down at the local bike shop for an Italian Day at the time, so left it with them as I have had to go away for three weeks.

Report back today says that we need to replace the parts shown in the photos below.  Engine is Atlas based, but am unsure if starter clutch is not Zane...

Can any of the usual suspects offer some advise as to the availability of these parts and to what may have caused the failure to occur.

Many thanks

Yogi
 

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Leo Zimmerman in Switserland makes them and better than the original item.
You can also get oversize roller with it.
Check the Atlas site for his address.

Hans
 

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Leo sold all of the first batch he made. Once there is a big enough demand he'll do another.

I've found in several OR600s shagged bearings on the starter clutch freewheel. These bearings are readily available and the number is 61805. You'll need two of them. Freewheel not sitting straight in the clutch, lean jetting, weak battery...any or all make life hard for the starter clutches  :(.

Tom
 
That is not an Atlas sprag clutch it is most likely a sprag clutch from a 650 Zane. It is a simple conversion and the Atlas you recently bought off Bob Dixon may well have this - his Barcelona rep' did. This is the way to go with an Atlas - if you PM me I will send details of what I did.

Dunno why your sprag bearing broke but possibly because the bike misfired as you turned the engine over - this can put the sprag out of phase and place undue force on an individual sprag as opposed to spreading it across all the sprags as they spring out. I had this problem with a Howdi clutch I put in my triples - Enfield India's had it on their 500 and put a delay in the starter circuit so the engine only fired once it was spinning. They break with regularity on Aprilia's.

The Zimmerman clutch is nicely made but doesn't really overcome the problem that the original sprag isn't up to the job - especially in the cold. The battery is undersize and the sprag ring gear made of chocolate which is why oversize rollers can work.

Nick :-)
 
Tom Eatman said:
Leo sold all of the first batch he made. Once there is a big enough demand he'll do another.

I've found in several OR600s shagged bearings on the starter clutch freewheel. These bearings are readily available and the number is 61805. You'll need two of them. Freewheel not sitting straight in the clutch, lean jetting, weak battery ...any or all make life hard for the starter clutches  :(.

Tom
Click to expand...


Thanks Tom,

Might be the last two...

Yogi
 
Nick said:
That is not an Atlas sprag clutch it is most likely a sprag clutch from a 650 Zane. It is a simple conversion and the Atlas you recently bought off Bob Dixon may well have this - his Barcelona rep' did. This is the way to go with an Atlas - if you PM me I will send details of what I did.

Dunno why your sprag bearing broke but possibly because the bike misfired as you turned the engine over - this can put the sprag out of phase and place undue force on an individual sprag as opposed to spreading it across all the sprags as they spring out. I had this problem with a Howdi clutch I put in my triples - Enfield India's had it on their 500 and put a delay in the starter circuit so the engine only fired once it was spinning. They break with regularity on Aprilia's.

The Zimmerman clutch is nicely made but doesn't really overcome the problem that the original sprag isn't up to the job - especially in the cold. The battery is undersize and the sprag ring gear made of chocolate which is why oversize rollers can work.

Nick :-)
Click to expand...

Thanks Nick

PM sent...

Yogi
 
Never ceases to amaze me the depth of knowledge on this forum! Alledged knowledge anyway! Anyone know the lotto numbers for Sat night?
 
My wife has put over 8000 kilometers on her Atlas since I rebuilt it and the starter clutch is still in excellent condition. The unit is up to the task when everything is in fine fettle. Most of the ORs I've dealt with have had 152 mains and 52 pilots installed and all of these have had knackered starter clutches. I remember reading something in the past that Laverda installed the leaner jetting for certain markets to get around the tightening emissions standards that were coming into play back in the 80s. The rest got bikes delivered with 162 mains and 62 pilots which is what I've been using and they seem to be much more co-operative. The DHLA carb is the same type used on certain Alfa Romeos and I've been getting my bits from a UK supplier (don't have the name handy but it was easy to find on the computer). If the bike is continually having problems with grenaded clutches you need to look a little deeper as to why this is happening.

Tom
 
Yep, the idle jet can put up with some serious reaming!  Cures most of the starting, idling and associated mechanical gremlins.

piet
 
if we slap an Ignitech ignition box on the bike we can program the ignition to fire after "x"' amount of engine revolutions have been achieved
on your Mirage we have the box set at 1 revolution before the ignition fires, we can set that figure at any number that suits the engine in question
neat set up trick on Ignitech's part

 
redax5 said:
if we slap an Ignitech ignition box on the bike we can program the ignition to fire after "x"' amount of engine revolutions have been achieved
on your Mirage we have the box set at 1 revolution before the ignition fires, we can set that figure at any number that suits the engine in question
neat set up trick on Ignitech's part
Click to expand...



That sounds interesting Red.  Can I discuss with you after you get back from the Congo South Africa?

Yogi
 
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