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Sportster engine in a BSA frame? #785358 09/24/19 11:38 pm
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cas.vanderwoude Offline OP
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At the risk of being burned at the stake, Id like to ask about using a Sportster engine in an A10 frame. I've seen a couple images of one in a Norton frame but have no idea if it would physically fit in an A10 or how much work there might be. Anyone have any experience with this?

I'd appreciate any advice and am ready to dodge the rotten fruit probably being hurled my way.

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Re: Sportster engine in a BSA frame? [Re: cas.vanderwoude] #785372 09/25/19 1:51 am
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DMadigan Offline
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A witch! A witch! Can we burn her?
How do you know she's a witch?
She looks like one! (in this case sounds like one)
No idea as I have not tried it but looking at an 883 (presumably that engine?) it is very long and tall. If you can cut and weld most any engine fits. Output sprocket on the opposite side from an A10 so swing-arm asymmetry is backward.

Re: Sportster engine in a BSA frame? [Re: cas.vanderwoude] #785394 09/25/19 10:24 am
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A Sportster engine is a unit and about 23 inches long, 20 tall and 18 wide, about 190 pounds with the electric starter for the older Ironhead and about 180 for the Evo Sportster..The engine mounts are front and rear, final drive is on the right...A 1200 Evo Sportster engine with $3000 worth of parts and machine work can make in excess of 100 reliable HP at the rear wheel....And some vibration, lol...
I believe it's a poor swap into an A10 frame unless you have a junk frame and an engine laying around and you like to modify stuff..


79 T140D, 96 900M Ducati ....On a bike you can out run the demons..
Re: Sportster engine in a BSA frame? [Re: cas.vanderwoude] #785396 09/25/19 11:08 am
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I wouldn't know about a Sportster engine, but this bike was at Trumansburg in July. It's a 45 with KH heads. I was told it is a hoot to ride, a lot of fun. Very nicely done.
[Linked Image from i.postimg.cc]
[Linked Image from i.postimg.cc]


Al Eckstadt
Re: Sportster engine in a BSA frame? [Re: Hillbilly bike] #785431 09/25/19 7:27 pm
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cas.vanderwoude Offline OP
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Originally Posted by Hillbilly bike
I believe it's a poor swap into an A10 frame unless you have a junk frame and an engine laying around and you like to modify stuff..


Thanks for the advice. I do have a frame and engine lying about but I'm not a masochist. So, it sounds like this combination is a bad idea that won't produce anything worthwhile.

Re: Sportster engine in a BSA frame? [Re: cas.vanderwoude] #785599 09/27/19 7:39 am
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There is currently one for sale in new Zealand on a auction website called trade me. Some good pictures and you may be able to make contact with the builder.

Re: Sportster engine in a BSA frame? [Re: cas.vanderwoude] #785614 09/27/19 11:07 am
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R Moulding posted it in Rod & Tappet this morning and left this link:
https://www.trademe.co.nz/motors/mo...qid=46bc34011dca485ca30ef593ec98deb0-004


Al Eckstadt
Re: Sportster engine in a BSA frame? [Re: Al Eckstadt] #785621 09/27/19 12:21 pm
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Originally Posted by Al Eckstadt
R Moulding posted it in Rod & Tappet this morning and left this link:
https://www.trademe.co.nz/motors/mo...qid=46bc34011dca485ca30ef593ec98deb0-004

That's a nice looking bike ..The Sportster Evo engine has the unit transmission cut off , the timing cover clipped at the front, also the stock front mounted oil filter appears to have been removed...These extensive modification require some alloy welding and are not for the feign of heart....Rigid mounted Evo Sportster engines have a different type vibration than a Brit Bike twin..In my opinion is why the 86-93 Sporster frames are so heavy, to help resolve some vibration issues. My 01 Sportster is fairly smooth up to 65-70 mph (3500 RPM) and smoother than my T140D, the Triumph being smoother beyond that ...Running up the Sporty engine to 6000 rpm in gears is the type of vibration that's hard to tolerate for more than a few minutes...
I still think it's a bad swap unless done like the bike in the ad...and then it might vibrate too much unless just cruising around....Just my opinion from actually riding a later Sporty


79 T140D, 96 900M Ducati ....On a bike you can out run the demons..
Re: Sportster engine in a BSA frame? [Re: Hillbilly bike] #785659 09/27/19 6:51 pm
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cas.vanderwoude Offline OP
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That is a NICE bike! and sorta what I was imagining. If I lived in NZ, I would buy that in a heartbeat. But I can now see that I do not have the skills to make something of that standard. I think I'll just look at the TradeMe listing and drool. . Whoever built that has a great eye for beauty and an ability to match.

Re: Sportster engine in a BSA frame? [Re: cas.vanderwoude] #785662 09/27/19 7:32 pm
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wilksville Offline
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I came across this a while ago, not a sportster engine but along the same lines apparently built at Small Heath ? http://victorylibrary.com/tech/Frankenstein.htm


'74 T140V,'83 XR1000, C&J FLATTRACKER T140,
Re: Sportster engine in a BSA frame? [Re: Hillbilly bike] #785663 09/27/19 7:45 pm
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kevin roberts Offline
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Originally Posted by Hillbilly bike

I believe it's a poor swap into an A10 frame unless you have a junk frame and an engine laying around and you like to modify stuff..


does this sound like someone i know?


every day you do not take a chance is a day of your life that you will never get back.
Re: Sportster engine in a BSA frame? [Re: kevin roberts] #785669 09/27/19 8:23 pm
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Originally Posted by kevin roberts
Originally Posted by Hillbilly bike

I believe it's a poor swap into an A10 frame unless you have a junk frame and an engine laying around and you like to modify stuff..


does this sound like someone i know?

Uh,you mean me?................My Sportster is getting a serious perfomance upgrade this winter...Later model Buell XB tight quench heads,10-1 flat top pistons,hotter cams.Combined with the Supertrapp 2-1 and the 90 degree airfliter on the bike, should be good for 90 [email protected] rpm and 100 ft lbs of pavement rippling torque all for about $1800....


79 T140D, 96 900M Ducati ....On a bike you can out run the demons..
Re: Sportster engine in a BSA frame? [Re: cas.vanderwoude] #785750 09/29/19 1:00 am
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gavin eisler Offline
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I think its a great idea , HD frames are junk compared to the BSA, it will be a tight fit but the handling cannot fail to improve.


71 Devimead, John Hill, John Holmes A65 750
56 Norbsa 68 Longstroke A65
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The poster formerly known as Pod
Re: Sportster engine in a BSA frame? [Re: gavin eisler] #785771 09/29/19 10:21 am
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Originally Posted by gavin eisler
I think its a great idea , HD frames are junk compared to the BSA, it will be a tight fit but the handling cannot fail to improve.

If you mean pre 86 Sportster frames....if a lug and tube Triumph or other Brit Bike frame is junk compared to an all welded A10 frame, then maybe..

Quote
Bodie says;
Is that you over on another channel discussing the possibilities of welding in quench shoulders to stock Triumph heads ? , I'm interested if you've done one yet to test the theory out , Also just to add ; I don't know if you've ever heard of "Singh grooves" .. I've never experimented with them myself but they're supposed to help with the combustion mixture & combat any tendencies that might lead to engine knock .


No ,not me.From what i learned on my race Triumph,..I did tighten up the circumferance quench band on my T140D to .032, stock it's an ineffective .060...Required milling the cylinders,shortening the pushrod tubes, buying shorter pushrods and careful assembly...The engine has 9.2 static compression ,but the fast combustion burn allows the timing to be backed off a few degress and the engine is happy on 90 octane gas and makes more power...


79 T140D, 96 900M Ducati ....On a bike you can out run the demons..
Re: Sportster engine in a BSA frame? [Re: cas.vanderwoude] #785974 10/01/19 2:56 pm
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gavin eisler Offline
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Yeah I meant pre 86 , my 78 XLH didnt have what I considered to be a frame, it was more like a badly bent bracket.
The full cradle A10 swing arm frame is up there with the featherbed in my book.


71 Devimead, John Hill, John Holmes A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: Sportster engine in a BSA frame? [Re: gavin eisler] #785978 10/01/19 3:16 pm
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Originally Posted by gavin eisler
Yeah I meant pre 86 , my 78 XLH didnt have what I considered to be a frame, it was more like a badly bent bracket.
The full cradle A10 swing arm frame is up there with the featherbed in my book.

Actually they didn't handle worse that other contemprary bikes, but had poor tires....This from a 1973 Cycle Magazine comparision test...Cook Neilson,succesful road and drag racer was editor and ran the bikes on a road course..Other bikes were a Trident, Norton, 750 Honda, Ducati, Kawi 900 and 750...A non professional rider may have more problems with handling..

Quote
Harley-Davidson’s Sportster was ham-strung by a rear tire that was as limiting as the one on the Ducati. The Goodyear skins are the only ones in the world that will fit H-D’s new safety rims. Ostensibly the rims will not let the tire distort enough to cause a crash if a blowout or sudden flat occurs. But the tires have squarish corners that distort and cause a host of weird antics during hard cornering. Suspension feel was perfect, as hard as we could push the bike with its squirrelly tire. Some problem was experienced with the caliper dragging on the disc after it was used hard for a few laps, but the brakes continued to stop well.


You put a stock Evo1200 Sportster engine with about 70 ft lbs of torque into a stock A10 frame it's going to distort the stock swingarm rubber bushings at the least if pushed to the limit...


79 T140D, 96 900M Ducati ....On a bike you can out run the demons..
Re: Sportster engine in a BSA frame? [Re: cas.vanderwoude] #786037 10/01/19 11:07 pm
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I changed the rear rim on mine from a 5x 16 ( came like that to me) to a 4 x 18 alloy rim , with decent tyres, Hagons and fresh swing arm bearings it wasnt as terrifying. The big bars were handy for wrestling it into submission. The way it came to me it was a deathtrap.
If you fitted a 1200 motor to the A10 , solid swing arm bushings might be a good thing.maybe a brace too.


71 Devimead, John Hill, John Holmes A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: Sportster engine in a BSA frame? [Re: gavin eisler] #786069 10/02/19 10:29 am
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My 01 Sportster handles quite nicely but does need deliberate rider inputs...Sort of like a big Moto Guzzi with slow very stable steering. Rear set controls and Koni shocks make a big difference as well as cutting off the close spaced "progressive" spring coils from the front forks and adjusting preload..I'm going to try and fit an 18 inch rear wheel, probably adapt a Japanese cast wheel..Not exactly a British special............


79 T140D, 96 900M Ducati ....On a bike you can out run the demons..

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