Author Topic: spark advancer from cb750 to be used on cb550 as replacement  (Read 2024 times)

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Offline francis8766

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spark advancer from cb750 to be used on cb550 as replacement
« on: January 01, 2014, 11:49:21 PM »
hi, im new to this forum pls. bare with me :)

my mom's best friend gave me his cb550 but its in a very bad condition. i was able to buy almost all the parts needed for the restoration but my only problem is that i cannot find the correct spark advancer for the cb550. is it possible to use the spark advancer of a cb750?  it is the only one available in my country thats why im wondering if the timing and all would somehow match that of the cb550. thanks :)

     

   
       
1975 honda cb550f

Offline dave500

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Re: spark advancer from cb750 to be used on cb550 as replacement
« Reply #1 on: January 02, 2014, 12:56:06 AM »
itll be ok,if you have a timing light check the full advance doesent go too far,if it does just adjust to the full advance and ignore the static "f"mark type setting that the book says.

Offline francis8766

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Re: spark advancer from cb750 to be used on cb550 as replacement
« Reply #2 on: January 02, 2014, 01:23:15 AM »
thank you very much dave500 :) ill try to post the bike when its done thanks again
1975 honda cb550f

Offline dave500

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Re: spark advancer from cb750 to be used on cb550 as replacement
« Reply #3 on: January 02, 2014, 01:35:11 AM »
your welcome no worries.

Offline francis8766

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Re: spark advancer from cb750 to be used on cb550 as replacement
« Reply #4 on: January 02, 2014, 01:44:29 AM »
oh i forgot, the original owner also lost the special washer for the spark advancer, is there a way to fabricate it or is it also possible to use a different washer from a donor bike? or a generic washer? thanks :)
1975 honda cb550f

Offline dave500

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Re: spark advancer from cb750 to be used on cb550 as replacement
« Reply #5 on: January 02, 2014, 01:48:43 AM »
im not sure what washer you mean?the advancer goes straight onto the crankshaft end and its held by a bolt,i think you mean the big nut on the end?you must have that nut,it has two square slots that line up on the end of the advancer and locates on those two prongs,by the way dont ever use a spanner on that big(fake nut)to turn the engine over with the spark pugs installed,you will break the little lugs or bend something,i havent got a photo of that nut on hand,someone might post one if they have one?heres the advancer itself,the fake nut locates onto those those two protruding lugs.

this shot just shows how if you dissemble the unit to be sure to align it the way it came apart,itll be 180 out otherwise and wont run unless you switch the blue and yellow wires over,lets not get into that,too much info?
« Last Edit: January 02, 2014, 02:12:02 AM by dave500 »

Offline yesteryear

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Re: spark advancer from cb750 to be used on cb550 as replacement
« Reply #6 on: January 03, 2014, 06:12:11 AM »
Here you go the nut.Not sure if parts numbers for the advance are the same 750 is 300 and 550 is 323.Must be something different otherwise Honda would have kept the same numbers may be wrong.All the best
Yesteryear

Offline francis8766

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Re: spark advancer from cb750 to be used on cb550 as replacement
« Reply #7 on: January 17, 2014, 12:29:23 AM »
Hey yesteryear, that's exactly the one im looking for. Ive been looking all over for that but i cant get a hold of one. Im currently using the spark advancer from a cb750 and it fits well so maybe ill try to look for cb7750 special washer. . I saw a few in ebay but its too damn expensive. . $150 for the special washer is just too much i think

Dave thanks for the advice the spark advancer fits well with the contact breaker
1975 honda cb550f

Offline dave500

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Re: spark advancer from cb750 to be used on cb550 as replacement
« Reply #8 on: January 17, 2014, 12:42:47 AM »
150 bucks?thieves!

Offline yesteryear

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Re: spark advancer from cb750 to be used on cb550 as replacement
« Reply #9 on: January 17, 2014, 04:38:01 AM »
Francis,
There is a shop in holland that have both New in stock 77euros +tax and post the last time I looked.
www.cmsnl.com     Maybe thats the way to go.
Cheers
Yesteryear
« Last Edit: January 17, 2014, 04:43:18 AM by yesteryear »

Offline dave500

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Re: spark advancer from cb750 to be used on cb550 as replacement
« Reply #10 on: January 17, 2014, 12:17:29 PM »

Offline bjbuchanan

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Re: spark advancer from cb750 to be used on cb550 as replacement
« Reply #11 on: January 17, 2014, 02:16:50 PM »
I'll sell you mine for way less, wherever you want it sent to. Just pm me
The dirty girl-1976 cb750k, Ebay 836, Tracy bodykit
Round top carbs w/ 38 pilots, middle needle position, airscrew 7/8ths out, 122 main jet
Stock airbox w/ drop in K&N, Hooker 4-1

Don't trust me alone with a claw hammer and some pliers

Offline francis8766

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Re: spark advancer from cb750 to be used on cb550 as replacement
« Reply #12 on: January 26, 2014, 10:15:12 PM »
@bjbuchanan, thanks a lot. I was able to get one from a 81 cb750 decommissioned police bike for about 20$. Thanks a lot guys for the help.
Anyway, is there a chance that i can swap the 81 cb750 front end with my 75 cb550? A friend of mine told me that the 76 cb750 will fit but he's not sure if 81 will. Thanks in advance
1975 honda cb550f

Offline bryanj

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Re: spark advancer from cb750 to be used on cb550 as replacement
« Reply #13 on: January 27, 2014, 11:40:27 PM »
Forks are a bigger diamete on the 81 and dont think the trees will fit without a lot of mods
Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!