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Author Topic: CB700SC Starter Failure  (Read 995 times)
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Anchormarck Topic starter
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Location: Santa Barbara, CA
Bike: CB700SC
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'86 700S R/W/B, '84/'85 FrankenRatHawk




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« on: December 21, 2009, 10:53:48 AM »

Hi all. New to this forum, long-time Nighthawk owner. At one point, I had 4 (well 3-1/2) CB700's. Now down to 1-1/2. Currently have an '86 R/W/B w/12k miles. In short, my starter just failed but, I had a spare in my inventory. Once replaced, the bike was fine. I was helped by a forum thread titled "83 CB550 Starting Issue." Because that helped me, I thought I'd join and post the symptoms and steps I followed before opening up the starter. Maybe someone else would benefit.

Bike had been starting fine then one recent afternoon, nothing. Just a click of the starter relay.
All lights were bright.
Checked the battery. All cells okay and voltage spot on. No corrosion on the connectors.
Checked the starter relay for continuity. Yep, good.
Checked all fuses up by the handlebar and the 30A at the starter relay/solenoid. Good.
Finally pulled the starter off.

Eeek. It was filled with black oil. The brushes were totally exploded. All of 'em. In fact, I only found a few little shards of them. I've rebuilt a couple of CB700 starters and never saw one this bad. Fortunately, I had a working starter on my project bike. A quick intall and my ride was good ta go!  thumb I plan to order the brush holder plate and rebuild it.

Speaking of my project bike... I had purchased two partial CB700's from a San Francisco salvage yard 6 or 7 years ago. Paid $150 total. Assembled one running NH but, (alas  Sad) the bike ran - right up until the battery died. Yah, it suffered from the dreaded alternator chain failure. So it has sat for years. Carbs are totally gummed up but, the engine still turns. Just won a working engine on Ebay ($200) and intend to swap it in and make it my winter/rain bike.

My first "real" bike was an '85 CB700SC. It and I were hit by a car. I almost lost my right foot but recovered. It however, died. RIP. My pristine '86 is a tribute to the years and miles of fun I had with old blue. So, I've got Race Tech springs and cartidge emulators in the front and Works 'Steel Trackers' shocks at the rear. She's good for schooling sport squids on twisty, downhill mountain roads where her low power and heavier weight don't work against her. And so it doesn't appear that I'm a sportbike-hater, I also ride an '07 GSX-R750 on road and track. To my eye and heart 'tho, the R/W/B '86 Nighthawk 700S is just beautiful!  happy1
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Tryvelcro
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Bike: 1991 CB750
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« Reply #1 on: December 21, 2009, 11:14:23 AM »

Welcome to the forums!

Gonna be nosey here, but you said you bought 2 at a salvage yard in SF - does that mean you live 'round these parts?   Which salvage yard?  (I just picked up a couple of parts from bikeyard, and I know there's a joint in Fremont, but I'm always looking for new places).
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Anchormarck Topic starter
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Location: Santa Barbara, CA
Bike: CB700SC
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'86 700S R/W/B, '84/'85 FrankenRatHawk




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« Reply #2 on: December 21, 2009, 11:34:59 AM »

Yah, it was the Bike Yard! There was a woman there with an 'eye' tatooed on her forehead. Basically, on her own, she loaded both bike carcasses into the back of my pickup. I'd say she's a good person to have backing you up should you find yourself in a bar fight. It's been years but, I think I've also been to that place in Fremont. Unsure. I'm actually down in Santa Barbara.  smiler
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Tryvelcro
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« Reply #3 on: December 21, 2009, 12:20:04 PM »

Yah, it was the Bike Yard! There was a woman there with an 'eye' tatooed on her forehead. Basically, on her own, she loaded both bike carcasses into the back of my pickup. I'd say she's a good person to have backing you up should you find yourself in a bar fight. It's been years but, I think I've also been to that place in Fremont. Unsure. I'm actually down in Santa Barbara.  smiler


The woman that owns the joint is cool.  The extra eye woman wasn't there when I went, but there was another woman dismantling a bike - I was a little scared of her, and she probably could have lifted 2 carcasses at the same time.

But they were awesome, had good prices & seem to be really well versed in bike boneyarding. :)
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skramer360
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« Reply #4 on: December 21, 2009, 07:01:33 PM »

 welcome Anchormarck. Thanks for posting your problem and fix. Always good to see another 700s owner  thumb
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« Reply #5 on: January 29, 2010, 04:13:20 PM »

Hi Anchormarck and welcome to the group.  How about some photos of your pristine rwb 86.  That's my favorite model, just don't tell my cb650sc!
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Dan
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84 Honda cb650 Nighthawk
03 Honda Reflex (Sold)
Anchormarck Topic starter
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Location: Santa Barbara, CA
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'86 700S R/W/B, '84/'85 FrankenRatHawk




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« Reply #6 on: March 23, 2010, 12:20:26 AM »

Hi Anchormarck and welcome to the group.  How about some photos of your pristine rwb 86.  That's my favorite model, just don't tell my cb650sc!

I'll havta do that this weekend. I'm currently resurrecting my 8 (9?) year CB700S project bike. Just swapped in the "newer" engine that (hopefully) doesn't have a busted alternator chain. Had to remove and replace one of the exhaust header studs that was busted by the dismantler - PITA! The inside of the tank was Nah-Hasty. Had vinegar brewing in the tank for a couple of days and when washed out with a garden hose spray nozzle, showed some very nice, clean, silvery metal! Yay! Currently, have the battery charger hooked up to the tank with a solution inside and a sacraficial bolt to draw the remaining rust out. Slow going that. A fresh air filter and exhaust header gaskets showed up today. In theory, I could have the carbs in on Saturday and everything buttoned up.  happy1
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highwayjamin
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« Reply #7 on: March 23, 2010, 06:23:39 AM »

 welcome We are glad to have you.
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