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Motor help please
#602275 06/18/2022 8:25 PM
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Haddon1 Offline OP
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Hello- everyone- On my 06 America I’m having to replace my engine- was wondering if anybody converted a EFI engine to run on carbs - My engine is carbs and I plan on keeping it carbed. So many good looking efi engines to buy but the carbed ones are few and look pretty bad. Anybody change an EFI over to carbs?

Re: Motor help please
Haddon1 #602276 06/18/2022 10:26 PM
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I am betting the camshafts are different but it ought to run.

Re: Motor help please
Haddon1 #602277 06/18/2022 10:45 PM
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Haddon1 Offline OP
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Thanks for your reply I’m planning on putting my 790 cams in it and run on my TP stage 2 computer. I have noticed that the flywheel pickup that goes into stator on the EFI seems to have a lot more castellated pickup magnets?? all the way around then the carbed ones — I wonder if they are all magnets or if it matters??? Or if I would have have to change it out to mine??? Anybody know??? Thanks

Re: Motor help please
Haddon1 #602278 06/19/2022 7:29 AM
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Good point. I believe you will also need to use your pickup and I wonder about the flywheel as well.

Re: Motor help please
Haddon1 #602279 06/20/2022 8:47 AM
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Fe Butt
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Fe Butt
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I don't know what the differences are but there are different CDIs even among carbed bikes.I am eventually going to try carbs on an 07 engine I have. I have not gotten back to my hard tail build since breaking my wrist. I have gotten backed up on everything else I need to get done that take priority. In my case I am going to put a set of old Amal carbs off of a Norton 850 Commando on it and see what happens.


I learned all I need to know about life by killing smart people and eating their brains.
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Re: Motor help please
Haddon1 #602280 06/21/2022 10:59 PM
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Could we ask what the problem is with your 06 engine forcing a complete replacement?


12 Rocket Roadster
03 Bonneville America
69 BSA Firebird Scrambler
73 Yamaha TX 750
Re: Motor help please
Haddon1 #602281 06/21/2022 11:33 PM
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Haddon1 Offline OP
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It blew up and cratered

Re: Motor help please
Haddon1 #602329 07/21/2022 8:07 AM
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Learned Hand
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Originally Posted by Haddon1
It blew up and cratered

any details or pictures?

Having had both the carbed and EFI versions of the SM, I think the EFI has more potential in that you can tune both fuel and ignition together rather than 2 separate entities like the carb/CDI arrangement. Plus the EFI bikes start easier than the stock or lightly modified carb bikes.

Last edited by mag10; 07/21/2022 8:08 AM. Reason: spelling

05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter

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