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Author Topic: Gr650 salvage help  (Read 276 times)

Offline Kolby198

  • Posts: 12
Gr650 salvage help
« on: Aug 15, 2017, 19:25:14 »
Hey guys. I've got a gr650 my friend gave to me this winter. Recently I've started trying to fix it up. Engine only has 29,000km and works well. The problem I'm having though is with the carbs. I can't seem to balance them right. I've cleaned them out 100% twice by boiling them out while completely disassembled and spraying air through all the passages. I know they are all clean. Now she needs a spritz of carb cleaner to get going but after it's fine. Touch the gas though and boom, dead. Got it to the point it will rev 3/4 of the way but as soon as I try it in gear it dies. I would use some help here.

I have a decent amount of garage mechanic experience on bikes engines but not so much in carbs. Any tips?


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Offline Cookie

  • Posts: 546
  • God help the child who grows out of everything
Re: Gr650 salvage help
« Reply #1 on: Aug 16, 2017, 15:45:14 »
Hey Kolby.  Nice to meet you

Use brake cleaner to check for ait leaks around the carb boots. You may have a lean condition caused by leaky insulators or insulator o-rings. Other items on the list would be torn diaphragms, possibly maladjusted idle screws. Are your float heights ok? Is the stupid vacuum peacock hooked up properly? ( that one got me on my Tempter awhile back)
* Insert something witty here *

81 CB750C
84 Tempter - well, most of it...

Offline Kolby198

  • Posts: 12
Re: Gr650 salvage help
« Reply #2 on: Aug 17, 2017, 00:00:39 »
Hey Kolby.  Nice to meet you

Use brake cleaner to check for ait leaks around the carb boots. You may have a lean condition caused by leaky insulators or insulator o-rings. Other items on the list would be torn diaphragms, possibly maladjusted idle screws. Are your float heights ok? Is the stupid vacuum peacock hooked up properly? ( that one got me on my Tempter awhile back)

Haha yea the vacuum line cost me a lot of time when I was working on my virago. Made sure that it was done right on this build. I did the spray check for air leaks and got nothing. The diaphragm is fine.  Made sure of it during the rebuild. How would you check float heights? As for the mixture screws I know they aren't right cause I had to spend some time screwing around with them just to get her started. (See what I did there?)

Any other ideas? Would be a shame to get stuck here.

Thanks for your reply


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Offline advCo

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Re: Gr650 salvage help
« Reply #3 on: Aug 17, 2017, 00:08:08 »
Torn diaphragms is a possibility. Have you bench synced/vacuum synced the carbs?

The float heights are checked with the bowl and gasket removed. Tilt the carbs so that the tang on the float is just resting against the spring loaded plunger of the float needle (NOT depressing it). Measure from the gasket surface of the carb body to the top of the float (technically it would be the bottom if the carbs were right side up). Check your manual for the specs, every carb is different but its usually somewhere between 18-22mm.
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
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Offline advCo

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Re: Gr650 salvage help
« Reply #4 on: Aug 17, 2017, 00:16:05 »
Here is a helpful diagram for float height adjustment

"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0

Offline Kolby198

  • Posts: 12
Re: Gr650 salvage help
« Reply #5 on: Aug 17, 2017, 08:19:22 »
Torn diaphragms is a possibility. Have you bench synced/vacuum synced the carbs?

The float heights are checked with the bowl and gasket removed. Tilt the carbs so that the tang on the float is just resting against the spring loaded plunger of the float needle (NOT depressing it). Measure from the gasket surface of the carb body to the top of the float (technically it would be the bottom if the carbs were right side up). Check your manual for the specs, every carb is different but its usually somewhere between 18-22mm.

Ok il try that next. Il see if I can get a video of it to show you.


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Offline Cookie

  • Posts: 546
  • God help the child who grows out of everything
Re: Gr650 salvage help
« Reply #6 on: Aug 18, 2017, 07:17:04 »
Haha yea the vacuum line cost me a lot of time when I was working on my virago...

Any other ideas?

Also check the little air induction tubes that run from the bottom of the carbs to the intake ports

Here's a link to the Factory Suzuki Service Manual in .PDF format.
https://www.google.ca/url?sa=t&source=web&rct=j&url=http://www.vanluik.eu/GR%2520650%2520tempter%2520Service%2520manual%2520(eng)%25201983-1984.pdf&ved=0ahUKEwi68dK5xeDVAhUKyoMKHXi0DvsQFggwMAE&usg=AFQjCNEl2IPa4xUwxixYh4fKDYGKAiY8Sw
A description of the air induction system is in section 1, page 15-16 (page 20/21 of the .PDF) as well as pretty much any specs, troubleshooting and wiring diagrams you night need.
* Insert something witty here *

81 CB750C
84 Tempter - well, most of it...

Offline Kolby198

  • Posts: 12
Re: Gr650 salvage help
« Reply #7 on: Aug 20, 2017, 10:16:47 »
Cheackes thoae and I hooked them up alright. Have gotten the time to check the floats but when I inspected them at first they seemed fine. I've been wrong before though.

I have to take my cx650e to the mechanic to get my carbs tuned. Il throw the tempter on the trailer and see if the mechanic has any good ideas.


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