Author Topic: Almost done  (Read 2702 times)

Online muskrat

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Almost done
« on: 05.11. 2009 11:49 »
G'day all,
            A few pics of "cafe" before maiden voyage, could have been last on 11yo race rubber. Run in & fine tune carbs then paint tank ( British racing green ) & chrome pipes. Goes quite well so far (65 moles ).
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Online RichardL

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Re: Almost done
« Reply #1 on: 05.11. 2009 13:51 »
I think the oil is going to leak out of your primary cover!  ;) *smile*
Plan on signing up for the world-wide 2020 DISTINGUISHED GENTLEMAN'S RIDEon September 27, 2020. This year it's a solo or pillion ride in dapper attire. Watch website at https://www.gentlemansride.com for details.


Offline pbaker

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Re: Almost done
« Reply #2 on: 05.11. 2009 21:57 »
Great Pipes Where did you get them from?

Offline Ronnie

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Re: Almost done
« Reply #3 on: 06.11. 2009 08:24 »
Looks great muskrat

Offline tombeau

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Re: Almost done
« Reply #4 on: 06.11. 2009 09:57 »
That looks like its going to be a lot of fun.
Cheers,
iain

Offline alanp

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Re: Almost done
« Reply #5 on: 06.11. 2009 14:37 »
Muskrat, love the bike, never thought of having an open case like that! I have a spare primary chain case kicking around here, umm.
What type of timing belt conversion is that with the diaphram clutch? I was going to get a Bob Newby, similar to the one on my Gold Star but now...
Member of the 'Last of the Summer Wine Club - Jennycliff'.

Online muskrat

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Re: Almost done
« Reply #6 on: 06.11. 2009 19:25 »
G'day All,
             the open primary was to quickly change the ratio's when I was racing, but using a Tri 4 spring setup. The new belt runs dry and I liked the look. Lytedrive in Melbourne supplied the kit lytedrive@optusnet.com.au with a 1.88:1 ratio (RGS I think), he also does std. Hr's a bit slow but worth the wait. QPD in the US also do one http://www.quietpowerdrive.com/QPDhtm/QPDhome.htm They both use a Commando clutch
The pipes were made by Reband in South Australia back in '90 for my A7SS racer. "LOUD" proper reverse cone megaphones tuned to length.
Too many mods to list, like the stainless coffee cups covering the under side of the speedo/tacho.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline tombeau

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Re: Almost done
« Reply #7 on: 06.11. 2009 20:14 »
Great Pipes Where did you get them from?
Armours do something pretty similar Peter.
Cheers,
Iain

Online muskrat

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Re: Almost done
« Reply #8 on: 09.01. 2010 20:29 »
Never quite finished when you build a special, but it will do for now. Too hot in shed to work, must ride to stay sane.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline MG

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Re: Almost done
« Reply #9 on: 09.01. 2010 20:43 »
Great work muskrat! A real beauty.

Too hot to work, boy, you got problems. We got 12" of snow today.  :!

What's the engine configuration (cc, cams, comp ratio, ...)?
1955 A7 Shooting Star
1956 A10 Golden Flash
1961 Matchless G12 CSR

www.histo-tech.at - Restoration, Repairs, Racing

Austria

Online muskrat

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Re: Almost done
« Reply #10 on: 09.01. 2010 21:42 »
G'day MG, thanks. the motor mods are extensive but here goes. '54 A7 twin carb head with stainless A10 valves, lightened rockers with allen key tappets, tapered alloy push rods. Head through bolted to cases. A10 +.010 10.5:1 pistons with 2mm offset gudgeon pins and chamfered skirts. Large journal crank on 1st grind and lightened. 357 cam and re-profiled lifters. Boyer ignition (snorton commie type) 31 deg adv. Two 30mm Kehin flat slides. Lytedrive belt primary & diaphram clutch & dyno belt. More I have probably forgotten.
Then I would need another two pages for the rest of the bike. More to do yet though.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline MG

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Re: Almost done
« Reply #11 on: 09.01. 2010 21:48 »
Nice mods. Which pistons are you using (make)? I got a set of forged Wisecos for the A10 recently to get rid of those awful GPMs, but they are only available in 9:1 cr. Other than that, they are really great.
1955 A7 Shooting Star
1956 A10 Golden Flash
1961 Matchless G12 CSR

www.histo-tech.at - Restoration, Repairs, Racing

Austria

Offline rocket man

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Re: Almost done
« Reply #12 on: 09.01. 2010 21:48 »
wish we had your weather its frezzzzzzzzing here

Offline trevinoz

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Re: Almost done
« Reply #13 on: 10.01. 2010 02:09 »
MG,
           I can't understand why you would have any issues with GPM pistons.
I have been using them for many years now in several bikes and find them as good or better than Hepolites.
Trev.

Offline MG

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Re: Almost done
« Reply #14 on: 10.01. 2010 08:19 »
Trev -
Maybe I was just unlucky enough to get a foul set of GPMs and the majority is ok, but the set I bought for the A10 had a wrong shape. Although the skirt diameter was right, both didn't have the barrel-like shape a piston usually should have, but were more or less just tapered. One of them even was hollow on one side, a fact I unfortunately didn't realize before fitting them.

I hope you know what I mean. Usually it should look like this: (_)
One of mine looked kind like that: (_(
exaggeratedly drawn  ;)

Well, as fortune would have it, this hollow side came to be fitted on the exhaust side of the LHS cylinder. When a piston shaped like that expands when warm, it naturally cuts of oil supply to the sliding surface between cylinder wall and skirt and it seized after the first few miles of serious riding, once the engine really got hot.
As you will probably know, GPMs come from Italy, and having talked to some people from this scene, they are also well.known for seizures and broken skirts in the Vespas and Lambrettas for which they produce pattern pistons, too.

A long story short: I personally will not use GPMs again and will not recommend them to anybody else. I made good experiences with the JPs in the A7 before I found the Wisecos. They are significantly more expensive, but you can literally see the difference in quality and accuracy.

Oh yes, I used a clearance of 0,12mm (0.00472 inch) on the GPMs, which should be enough considering the fact that they recommend 0,10mm
1955 A7 Shooting Star
1956 A10 Golden Flash
1961 Matchless G12 CSR

www.histo-tech.at - Restoration, Repairs, Racing

Austria