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bodyperson
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Joined: Feb 22, 2009
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PostPosted: Sun Feb 22, 2009 12:55 pm Reply with quote Back to top

Hello people, my name is Charlie. I am a bodyman by trade. I'm not much of a poster. Joined this awesome site for the technical info and some help seeing how I just took possession of a 1980 cb750 f. Ya the one with the
Barracuda behind it in kalispell, MT. By the way I have a 67 barracuda. I traded some old mopar parts for it. I had no money into the parts so I took a chance on the non running bike.
The gas tank is full and looked and smelled good. So I hooked up a battery and it did nothing but click when I hit the start button. Next I bypassed the relay and nothing but a louder click (starter engaging but not turning). Next I pulled the starter and checked it and it works fine. Next thing was to pull the plugs(very light almost white) put it in 5 th gear and tried to turn the engine over. No turny over. Sooo I grabbed a beer and cried a little. What should I do next if you don't mind me asking or maybe I should move this to the technical forum, charlie
 
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pd750
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Joined: Aug 01, 2007
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Location: On the road , again .

PostPosted: Sun Feb 22, 2009 3:04 pm Reply with quote Back to top

Welcome to the site Charlie ... Smile

How many miles on the bike ?

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holysmokes
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Joined: Jul 25, 2007
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Location: ridge road springfield nova scotia

PostPosted: Sun Feb 22, 2009 3:32 pm Reply with quote Back to top

seized?

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bodyperson
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Joined: Feb 22, 2009
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PostPosted: Sun Feb 22, 2009 3:58 pm Reply with quote Back to top

25,000 miles on bike. the chrome pipes are bluish a couple of inches down. I was just wondering if it could be something other than the engine? I suppose anything is possible. charlie

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1980 cb750f (junk motor)
1985 xl600r
1980 cb900c
1982 cb900f supersport
When you profess yourself to be wise you become a fool 
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OldTimer
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Joined: Aug 02, 2007
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Location: Conroe, TX

PostPosted: Sun Feb 22, 2009 4:30 pm Reply with quote Back to top

Welcome Charlie! Welcome

Pipes sometime blue. Sounds like the engine is seized. I would a little lightweight oil in the cylinders throught the spark plug holes and let it sit for a while. Leave the plugs out.

Then remove the right alternator cover and using the rotor bolt, work it back and forth to see if it will break loose.

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81 CB900C (Sold)
83 CB1000C 
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bodyperson
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Joined: Feb 22, 2009
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PostPosted: Sun Feb 22, 2009 4:34 pm Reply with quote Back to top

thanks oldtimer I'm doing that right now. Putting a water pump in the wifes' truck also UGH. charlie

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1980 cb750f (junk motor)
1985 xl600r
1980 cb900c
1982 cb900f supersport
When you profess yourself to be wise you become a fool 
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pd750
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Joined: Aug 01, 2007
Posts: 24914
Location: On the road , again .

PostPosted: Sun Feb 22, 2009 4:35 pm Reply with quote Back to top

Like smokes says , it could be seized . Very light colored plugs and bluish head pipes , indicates a lean mixture .

Drain the oil and drop the pan looking for anything that's not suppose to be there .

Next , I'd pull the valve cover and insure the timing chains are as they should be .

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holysmokes
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Joined: Jul 25, 2007
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Location: ridge road springfield nova scotia

PostPosted: Sun Feb 22, 2009 4:35 pm Reply with quote Back to top

UGH to you too Laughing

_________________
On a steel horse i ride


People are just as happy as they make up their
minds to be. ― Abraham Lincoln
http://i559.photobucket.com/albums/ss31/johnveinot/DSCF1663.jpg
04 vl800
09 50 honda jazz

Paint gelding 
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bodyperson
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Joined: Feb 22, 2009
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Location: NW, MT

PostPosted: Sun Feb 22, 2009 5:43 pm Reply with quote Back to top

well I got the crank to turn by using the rotor bolt but only wants to turn about 30 degrees and then stops. O ya and only one piston is moving. Gonna drain the oil next and I will expect to see chunks of the crank? or rods? or both? charlie

_________________
1980 cb750f (junk motor)
1985 xl600r
1980 cb900c
1982 cb900f supersport
When you profess yourself to be wise you become a fool 
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bodyperson
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Joined: Feb 22, 2009
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PostPosted: Sun Feb 22, 2009 6:09 pm Reply with quote Back to top

well I did find one little chunk of ferrous metal about the size of small brad nail. Might as well stop as I don't have time or money to do anything more.
Or can I disassemble the motor besides the valve covers (as pd750 suggests )while in the frame of the bike. Thanks, charlie

_________________
1980 cb750f (junk motor)
1985 xl600r
1980 cb900c
1982 cb900f supersport
When you profess yourself to be wise you become a fool 
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holysmokes
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Location: ridge road springfield nova scotia

PostPosted: Sun Feb 22, 2009 6:58 pm Reply with quote Back to top

one piston moving?

1-4
2-3

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On a steel horse i ride


People are just as happy as they make up their
minds to be. ― Abraham Lincoln
http://i559.photobucket.com/albums/ss31/johnveinot/DSCF1663.jpg
04 vl800
09 50 honda jazz

Paint gelding 
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bodyperson
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Joined: Feb 22, 2009
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PostPosted: Sun Feb 22, 2009 7:39 pm Reply with quote Back to top

correction #1 and #3 are moving. #2 and#4 are not moving.

_________________
1980 cb750f (junk motor)
1985 xl600r
1980 cb900c
1982 cb900f supersport
When you profess yourself to be wise you become a fool 
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OldTimer
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Joined: Aug 02, 2007
Posts: 10211
Location: Conroe, TX

PostPosted: Sun Feb 22, 2009 8:04 pm Reply with quote Back to top

Crap! bricks

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81 CB900C (Sold)
83 CB1000C 
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bodyperson
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Joined: Feb 22, 2009
Posts: 172
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PostPosted: Sun Feb 22, 2009 9:12 pm Reply with quote Back to top

Thanks for the help and the welcome. I sure do like these cb bikes. I suppose I'm hooked now. I can remember when i was a kid, my friends dad had a 750 four with a sissy bar. We could wheelie that thing for miles. Sure would like to do the cafe thing and bigger engine but I think my money would be better spent on something else. How far would $1000 get me on an engine. any idea? The rest of the bike is pretty nice. charlie

_________________
1980 cb750f (junk motor)
1985 xl600r
1980 cb900c
1982 cb900f supersport
When you profess yourself to be wise you become a fool 
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pd750
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Joined: Aug 01, 2007
Posts: 24914
Location: On the road , again .

PostPosted: Sun Feb 22, 2009 9:23 pm Reply with quote Back to top

Cut a straight piece of wire , about a foot long . drop it down the holes that you think aren't moving and turn the crank . They may just be at the bottom of the stroke and hard to tell movement .

The motor has to come out of the frame for dismantling .

The valve cover can be removed while in frame .

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bodyperson
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Joined: Feb 22, 2009
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PostPosted: Sun Feb 22, 2009 10:04 pm Reply with quote Back to top

ok I did the wire trick and yes 1 3 4 are moving. # 2 does not move and I can feel an audible clunk telegraphing through the piece of wire on the #2 piston when the crank rotation stops. Now I'm thinking broken rod.

_________________
1980 cb750f (junk motor)
1985 xl600r
1980 cb900c
1982 cb900f supersport
When you profess yourself to be wise you become a fool 
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holysmokes
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Joined: Jul 25, 2007
Posts: 37019
Location: ridge road springfield nova scotia

PostPosted: Mon Feb 23, 2009 8:39 am Reply with quote Back to top

rod bearings are on rolled on top of each other on #2

you need to pull the engine and split the cases

maybe a new crank with bearings

_________________
On a steel horse i ride


People are just as happy as they make up their
minds to be. ― Abraham Lincoln
http://i559.photobucket.com/albums/ss31/johnveinot/DSCF1663.jpg
04 vl800
09 50 honda jazz

Paint gelding 
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pd750
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Joined: Aug 01, 2007
Posts: 24914
Location: On the road , again .

PostPosted: Mon Feb 23, 2009 10:35 am Reply with quote Back to top

Sad

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rtabish
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Joined: Jul 25, 2007
Posts: 2386
Location: missoula, montana

PostPosted: Mon Feb 23, 2009 1:53 pm Reply with quote Back to top

hey charlie. i see there is a CB900 Custom on Craigslist in Kalispell for sale for $800. that doesn't do you much good for fixing up the F on a budget, since putting 900 parts in a 750 requires a bit of work. if you were seriously interested in putting together a CB900F, i have a titled frame, bodywork, and a mostly complete 900 engine that needs rebuilt that i may as well let go of. you could probably sell the 750 as parts to fund putting together the 900. it would be a great experience to put one of these old bikes together, and YOU HAVE A GARAGE...something i lack Crying or Very sad

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bodyperson
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Joined: Feb 22, 2009
Posts: 172
Location: NW, MT

PostPosted: Mon Feb 23, 2009 11:14 pm Reply with quote Back to top

thanks for the heads-up on the 900 custom rtabish. I can't believe I missed it I hit that craigslist at least twice a day. I have contacted the guy and I just may buy it. seems like a good deal. he said it was running good this summer and then started bogging down on acceleration. someone told him it is the carbs so he tore em off and did nothing to fix em. He said he would put em back on to show me it runs but I believe the guy. He is also selling an Intruder 1400. He is not working (imagine that) seems like an honest guy.
does that seem like a fair price. $800 for a 900 custom 1980 40,000 miles. He says it real clean and comes with extras. I hate to offer him less if its worth the asking price. charlie

_________________
1980 cb750f (junk motor)
1985 xl600r
1980 cb900c
1982 cb900f supersport
When you profess yourself to be wise you become a fool 
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rtabish
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Joined: Jul 25, 2007
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Location: missoula, montana

PostPosted: Mon Feb 23, 2009 11:51 pm Reply with quote Back to top

you can clean up the stock carbs pretty easy. i emailed him asking about the mileage and maintenance on it. at 40K, i would be interested in the valve adjustment and the charging system on the bike. i am betting he knows little about the bike, and would be glad to be rid of it. the bike is complete, and if you are comfortable with the price, maybe dicker a bit to get down some.

i know the flathead is an economic hole right now......[you should of been there in the early 80s when i lived there and there were NO jobs but plum creek and the aluminum plant and a handful of minimum wage service jobs]. there are only a couple places in the flathead that i have heard of to work on a bike this old, and none of them are the dealers there. but there are a couple bike wreckers here in missoula and a pretty good shop.

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~Eagles may soar in the clouds, but weasels never get sucked into jet engines. ~

Rob Tabish
83 CB1000 Custom 
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bodyperson
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Joined: Feb 22, 2009
Posts: 172
Location: NW, MT

PostPosted: Tue Feb 24, 2009 12:38 am Reply with quote Back to top

thanks for the input rtabish, I hate to beat a man when he is down. And by the way I was in the Flathead in 1980 and was working a minimum wage service job. Far West Gas and Oil for an old boy named Cecil Hudson. Now that I think about it that is a cool name. He also owned the Jet station in Kalispell ,on the strip. I think Shop-Ko is around the area the old jet station was. And by the way, what makes you think I have a garage? I'm actually working out of an abandoned car wash next to a motel that has wireless internet. P.S. I was a gas jocky telling loggers they could only have 100 gallons of fuel a day to go out and make a living. I grew up fast. charlie

_________________
1980 cb750f (junk motor)
1985 xl600r
1980 cb900c
1982 cb900f supersport
When you profess yourself to be wise you become a fool 
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rtabish
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Joined: Jul 25, 2007
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Location: missoula, montana

PostPosted: Tue Feb 24, 2009 4:28 am Reply with quote Back to top

i remember the Jet Oil station vaguely.....kinda down by K-Mart and Snappys, if that is the area you are talking about. funny how so much has changed and still looks the same there.

and i was just referencing your picture from craiglist....the one with the barracuda and the bike. looks like a garage to me.

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~Eagles may soar in the clouds, but weasels never get sucked into jet engines. ~

Rob Tabish
83 CB1000 Custom 
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bodyperson
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Joined: Feb 22, 2009
Posts: 172
Location: NW, MT

PostPosted: Tue Feb 24, 2009 9:38 am Reply with quote Back to top

ya that's the area I'm talking about. The picture on craigslist is from the guy I bought the bike from. Not my garage. I was just kidding about the car wash thing, thinking you were being overly assumptive. I do have a working garage though. I think I will start a thread called "show us your work area" Or maybe some one else would start it while I'm cleaning mine up. charlie

_________________
1980 cb750f (junk motor)
1985 xl600r
1980 cb900c
1982 cb900f supersport
When you profess yourself to be wise you become a fool 
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pd750
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Joined: Aug 01, 2007
Posts: 24914
Location: On the road , again .

PostPosted: Tue Feb 24, 2009 10:03 am Reply with quote Back to top

Quote:
while I'm cleaning mine up. charlie


You better not do that !!! Heck , you'll never find anything again ... LOL

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Please put the year and model of your bike in the signature section on your profile / member account page and set \\\\\\\"Always attach signature \\\\\\\" to YES . Just below the Reply box , check the box in front of \\\"Attach signature (signatures can be changed in profile)\\\" . 
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