Author Topic: Mod to primary tensioner  (Read 3050 times)

Online muskrat

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Mod to primary tensioner
« on: 26.05. 2011 11:18 »
G'day all,
            as I had the clutch out to rid it of the petrol that filled the crankcase and primary (left the fuel tap on) I did the usual check on things. The tensioner was getting 1mm gouges from chain wear and the chain plates were wearing as well.
 I thought as modern bikes have nylon chain guides why not ours. I cut a strip off a nylon cutting board and attached it with 4 countersunk screws. The tensioner is very hard steel so had to use a masonry bit to drill it.
 Will check it's wear at next oil change and report back.
 Bugga, just looked at pics, forgot to lockwire the nuts. Back to the shed!
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Online bsa-bill

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Re: Mod to primary tensioner
« Reply #1 on: 26.05. 2011 12:42 »
Steady on Muskrat, your shaming us here - a degree wheel incorporated, I'm impressed *respect*
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Online muskrat

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Re: Mod to primary tensioner
« Reply #2 on: 26.05. 2011 13:11 »
She's got Boyer so strobe to time. 5 degree markings.
Still trying to make everything go faster  *smile*
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Online chaterlea25

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Re: Mod to primary tensioner
« Reply #3 on: 26.05. 2011 18:33 »
Hi Muskrat,
Nice mod  *smile*
Be prepared for some nylon shavings in the primary until the  chain side plates cut their own grooves
and the rollers will then run on the nylon
I dont know how Mrs M will react when she finds a lump gone from the chopping board *eek* *eek*

Like the degree wheel *smile*

Regards
John O R
1961 Super Rocket
1963 RGS (ongoing)

Offline rocket man

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Re: Mod to primary tensioner
« Reply #4 on: 26.05. 2011 19:12 »
nice mod muskrat  hide the rolling-pin  *lol*

Offline wilko

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Re: Mod to primary tensioner
« Reply #5 on: 26.05. 2011 20:58 »
Pity they didn't incorporate this system onto the swingingarm models.

Offline terryk

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Re: Mod to primary tensioner
« Reply #6 on: 27.05. 2011 15:56 »
I have a heap of worn chain adjusters so I will be interested how it goes Muskrat. I have thought of getting some of them metal spayed and build up has anyone done this before ?
1950-53 A10 rigid/plungers, 1958-61 A10 super rockets, 1947-50 A7 longstrokes, 1949 Star twin,
1951-54 A7 plungers, 1940s M21, WDM20s,
1948-50s B33s rigid/plunger/swingarm, 1948-50s b31s rigid/plunger/swingarm

Offline shabashow

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Re: Mod to primary tensioner
« Reply #7 on: 28.05. 2011 17:15 »
Looks a great idea as new ones are imposible to find. It also gives you a bit more adjustment. Mine's screwed all the way in, and there still a wee bit more play in the chain than I'd like. Suppose the real solution would be to get a new chain, but I've been holding off as the adjuster has groves perfectly aligned with the existing old chain.
I'd also need new sprockets, and as the clutch housing is integral with the large sprocket, and is also as rare as hen's teeth, that was a major hold up.
We'll watch this developmant with interest.

Offline a10gf

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Re: Mod to primary tensioner
« Reply #8 on: 28.05. 2011 17:22 »
Great mods  *smile* , thanks for the ideas.

A10 GF '53 My A10 website
"Success only gets you a ticket to a much more difficult task"

Offline trevinoz

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Re: Mod to primary tensioner
« Reply #9 on: 28.05. 2011 23:16 »
Terry,
             If you go that way you will probably have to get them hard chromed as they appear to be originally.
Another solution may be a neoprene strip glued to the face if you can find a suitable adhesive.
I reckon the nylon or neoprene would result in a bit of a reduction in noise.

  Trev.

Online muskrat

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Re: Mod to primary tensioner
« Reply #10 on: 28.05. 2011 23:32 »
Your right Trev, I can nearly hear myself think now (not that I do much of that while riding). First test ride very pleasing.
I thought about adhesive but was worried what would happen if it came off  *eek*. Drilling hard steel is easy with a carbide masonry bit sharpened like a normal drill bit. Lots of RED loctite on the nuts plus a center punch for good measure.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline terryk

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Re: Mod to primary tensioner
« Reply #11 on: 29.05. 2011 14:04 »
Keep us posted Muskrat how it goes mate. You might be the forerunner of a new mod we will all have to do. Trend setter.
1950-53 A10 rigid/plungers, 1958-61 A10 super rockets, 1947-50 A7 longstrokes, 1949 Star twin,
1951-54 A7 plungers, 1940s M21, WDM20s,
1948-50s B33s rigid/plunger/swingarm, 1948-50s b31s rigid/plunger/swingarm

Offline a10gf

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Re: Mod to primary tensioner
« Reply #12 on: 28.08. 2011 10:02 »
How did it go ?

A10 GF '53 My A10 website
"Success only gets you a ticket to a much more difficult task"

Online muskrat

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Re: Mod to primary tensioner
« Reply #13 on: 28.08. 2011 10:37 »
G'day e,
           Might get around to inspect this week. I think it's done about 600 miles. Been busy with a new project '64 A65.
Cheers.
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline tombeau

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Re: Mod to primary tensioner
« Reply #14 on: 28.08. 2011 11:17 »
steady onMuskrat. That could constitute crossing over to the dark side *smile*