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Hard to start when its hot.

  • Thread starter Thread starter Anonymous
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Anonymous

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I finally got every thing where it seems to work right and took my 1982 GS750t(that the people from this web site helped me get running) for a two hour drive.It was great to be on the open road again after a 10 year absent from motorcycles. I have found one problem for now with the bike on long rides,It cranks real hard when its hot.I know on a car it means the timming is off a little so I presume thats the case with my GS.If so , how do you check the timming and set it?I still havent found a set of side plates for that model yet so if anyone has any ideas I would be thankfull.
 
Re: Hard to start when its hot.

I'm not postive of how the T model differs from the E and L model relative to ignition. However, if you have the stock electronic ignition in the bike, I dont think it is adjustable. You can look on the breaker plate to see if it is mounted by three screws. If the 12 oclock screw does not fit through a slot in the plate, then there is no adjustment possible. (logical deduction, but not a fact)

Earl


zentar said:
I finally got every thing where it seems to work right and took my 1982 GS750t(that the people from this web site helped me get running) for a two hour drive.It was great to be on the open road again after a 10 year absent from motorcycles. I have found one problem for now with the bike on long rides,It cranks real hard when its hot.I know on a car it means the timming is off a little so I presume thats the case with my GS.If so , how do you check the timming and set it?I still havent found a set of side plates for that model yet so if anyone has any ideas I would be thankfull.
Click to expand...
 
My 82 gs850 has electronic ignition.

My 82 gs850 has electronic ignition.

I dont think you can change the timing. Its all built to fixed settings that should be right on. Coils? does it die on you after you ride it for a while?
 
No. It seems to run great the whole time iam ridding.It does cut out a little when you first take off but picks up real fast.
 
Is this bike going to last more than 20000 miles because mine has 19500 miles on it already and I just got it running.
 
The next time you have ridden for a bit and want to restart the bike, open the gas cap first and then try to start the bike, The cap may not be venting.
It could also be a leaking vacuum line on the petcock. You could try switching to prime for starting. That will bypass the vacuum function.

Earl

zentar said:
No. It seems to run great the whole time iam ridding.It does cut out a little when you first take off but picks up real fast.
Click to expand...
 
I usually find that the battery itself is the problem: a small loss in total capacity shows up when trying to crank a hot motor.
 
Vent

Vent

I think Earl's on the right track. I had a similar problem with both a Triumph and a Harley....in both instances, it was a problem with the gas vent.
 
I had the exact same problem on my Honda CB 1100 F. When I baught it, it had a brand new battery in it. When cold it cranked over perfectly, but when hot, it would rarely start. I cleaned & tightened all connections, replaced the solenoid, had the starter rebuilt, but nothing changed. I finally decided the new battery must be bad. When changing the battery, I found the original owner had put in a YBL 12 LA 2. It should have been a YBL 14 LA 2. The new correct battery fixed her right up.
 
Re: Hard to start when its hot.

zentar said:
I finally got every thing where it seems to work right and took my 1982 GS750t(that the people from this web site helped me get running) for a two hour drive.It was great to be on the open road again after a 10 year absent from motorcycles. I have found one problem for now with the bike on long rides,It cranks real hard when its hot.I know on a car it means the timming is off a little so I presume thats the case with my GS.If so , how do you check the timming and set it?I still havent found a set of side plates for that model yet so if anyone has any ideas I would be thankfull.
Click to expand...
I'm not sure what you mean by 'cranks real hard'. Do you mean it just takes a long time to start? And do you have to open the throttle to help it start? If so, try turning the side air-screws out a full turn. If they are adjusted too far in(rich)the bike would start up from cold just fine and run OK. But when you try to re-start while still hot it would be too rich to start easily. KK.
 
What I mean by "Hard to start when Hot" is it cranks real hard like its hard to turn over.A motorcycle mech. told me it could be the starter not wanting to crank when its hot. I still dont have any idea how many miles these bikes are good for.I only want to know because I need a new seat and side plates but Iam not going to sink any more money if there is a chance that it wont last another 500 miles. I know there is no promises but if i knew that other GS 750s have lasted 30000 miles I dont mind taking a chance.
 
My 79 GS1000 is based on your motor and has over 100,000 miles. Do you have a friend who has a KZ900/1000, a GS650-1100, a Yamaha XJ600-900, or any early 80s bike? The battery for your bike (12N14-3A or YB14-LA2, I think) is used in many other bikes, and if you could borrow a good one you can check to see if that is the problem.
 
I have 30,000 on my 79 GS 750 and its just barely broken in good. :-)
30,000 isnt taking any chance at all. LOL

Earl




zentar said:
What I mean by "Hard to start when Hot" is it cranks real hard like its hard to turn over.A motorcycle mech. told me it could be the starter not wanting to crank when its hot. I still dont have any idea how many miles these bikes are good for.I only want to know because I need a new seat and side plates but Iam not going to sink any more money if there is a chance that it wont last another 500 miles. I know there is no promises but if i knew that other GS 750s have lasted 30000 miles I dont mind taking a chance.
Click to expand...
 
My '79 1000 had 106,000 miles and was still running OK(just a puff of warm up smoke and some minor engine noises).I decided to do a total restoration and did'nt care about squeezing more miles out of it.These engines will last a long time if given fresh oil and ridden sensibly.As for the hot starting problem,I would check for water in the battery first. My battery water level used to go down every 3 months or so. After I put in the Electrex R/R it lasts a lot longer. Use distilled water. I would next try a complete cleaning of the connectors. Then try a new battery. PS: Just a thought, I've never tried it, if these bikes will still run with the battery not connected, try starting it up and then dissconnect and safety the battery leads. Ride it until it's hot enough and go back home and turn it off. Re-connect it and see if it starts OK with a hot motor/starter,but a 'cool' battery.If it starts OK it would indicate a bad battery or the battery is getting overheated by the voltage regulator. If it still starts hard,it would look more like a starter problem? If you can do this test, keep in mind you'll have no lights or horn. I don't want to talk you into a road safety problem, just trying to help troubleshoot.
 
I would not recommend disconnecting the battery while the bike is running. The battery provides a buffer that absorbs the voltage production and smooths out the peaks in the electrical system. Any EEs care to elaborate?
 
Don Lobacz said:
I would not recommend disconnecting the battery while the bike is running. The battery provides a buffer that absorbs the voltage production and smooths out the peaks in the electrical system. Any EEs care to elaborate?
Click to expand...

So do you think it would hurt to test just long enough to get the motor hot?
 
I would not recommend doing it at all, ever. I was hoping some of the electrical technicals would jump in and fill in details.
 
Kieth What Don is saying is the R/R will "see" a completely dead battery and try to charge it.In other words the voltage output allowed by the R/R will be about 16-17 volts and max amps which WILL let the smoke out of the electrics. :oops:
 
I have an 82 750EZ, it does the same thing for as long as I can remember. Even when mine is cold it does not crank as fast as my brothers 83 1100ED. I replaced all main cables with 6 AWG power wire and used gold plated connectors, new battery, nothing has changed it. Now my motor is highly modified with high compression, so this is a contributing factor. When my bike is hot, I leave it until the motor temp comes down to about 100.......no choke....no throttle....hit the starter and up she goes. You can try going to a colder set of plugs...this often helps, by not letting the motor get as hot in the first place.


I will be tring two things next season:

Replace the starter bushings
Replace the bushing springs

I basically have just learned to live with it............GS quirk.......maybe!

The Good Doctor
 
hoyterb said:
Kieth What Don is saying is the R/R will "see" a completely dead battery and try to charge it.In other words the voltage output allowed by the R/R will be about 16-17 volts and max amps which WILL let the smoke out of the electrics. :oops:
Click to expand...
Thanks for educating me. I came up with the idea from way back in the '70s. Several of us had 'enduro' type bikes and we removed the batteries and lights,etc, and changed them to 'mx' bikes. Nobody ever had an electrical problem from doing this. But if you say the GS would have problems,then I won't dissagree.
 
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