Just bought a gs 750

[npntransistor]

First of all hi every one!

I have recently purchased a 1977gs 750. Only been riding 2 weeks and have put about 1,000 miles on the little bugger. The bike has 28k miles on it with realy no mjor problems. In a few weeks a few of my friends on I are planning a trip up to wisconsin. About 1,500 miles round trip. I want to get the bike tuned up and ready to go.

A few q's

when not in gear if i blip the throttle more then half way from idle it stalls out. is this normal? other then that it runs realy well especialy at higher rpm's. after i get it past 4 grand it will do whatever you tell it to. this also true on the road. only it bogs down but doesnt stall.

The idle is kind of iffy. it stalls every now and again if the idle is below 1,000 rpm and very rarely when set at about 1,200 which is kinda high.

when sitting on the bike starting from the left cylenders 1&3 keep tuning brown even when i shine them, i think they might be running ritch.

i would like to tune all the carbs. the last guy that owed it wasnt very savy and he metioned he messed with them so i want to make sure everything is right. anyone know of a good guide for tuining the carbs or have any info? i would like to get a manual but i am unemployed right now and my budget is realy realy tight.

I know thats alot of q's but if anyone can shed any light on anything i would be most gratefull.

~thank you, kevin

[doctorgonzo]

Basscliff will be along with his mega welcome soon. In the meantime, there is thread on carb specs (stock ones) pinned near the top, and there are some carb guides in the "In the Garage" on the main GS Resources page. Good foundation on the carbs.

[SqDancerLynn1]

You can get a GS750/1000 manual from BikeCliff's web site either one would work for general repair info I would bet you have some bad intake boots

[TheCafeKid]

First of all hi every one!

I have recently purchased a 1977gs 750. Only been riding 2 weeks and have put about 1,000 miles on the little bugger. The bike has 28k miles on it with realy no mjor problems. In a few weeks a few of my friends on I are planning a trip up to wisconsin. About 1,500 miles round trip. I want to get the bike tuned up and ready to go.

A few q's

when not in gear if i blip the throttle more then half way from idle it stalls out. is this normal? other then that it runs realy well especialy at higher rpm's. after i get it past 4 grand it will do whatever you tell it to. this also true on the road. only it bogs down but doesnt stall.

The idle is kind of iffy. it stalls every now and again if the idle is below 1,000 rpm and very rarely when set at about 1,200 which is kinda high.

when sitting on the bike starting from the left cylenders 1&3 keep tuning brown even when i shine them, i think they might be running ritch.

i would like to tune all the carbs. the last guy that owed it wasnt very savy and he metioned he messed with them so i want to make sure everything is right. anyone know of a good guide for tuining the carbs or have any info? i would like to get a manual but i am unemployed right now and my budget is realy realy tight.

I know thats alot of q's but if anyone can shed any light on anything i would be most gratefull.

~thank you, kevin

Brown eh? Maybe weeping some oil somewheres and baking on the motor? Or are you talking about the pipes? If the pipes are brown (gold) you MIGHT MIGHT be a little LEAN, not rich. If ya make it out this way over the 4th weekend, we can play with it. I can show you MY 77 750 project too, if i have it running by then

[npntransistor]

If the pipes are brown (gold) you MIGHT MIGHT be a little LEAN, not rich.

yes i was meaning the pipes, and lean, my bad. i may have to take a ride

[greg78gs750]

sweet. i have a 78 750. check out the vm carb rebuild, sounds like you need a cleaning/o-ring deal, standard op procedure. the vms you can trick if you blip them too quick, but sounds like you have more than just this. check the valves, etc. just do everything basscliff's welcome tells you, and you will be set!!!

[greg78gs750]

oh, and they are a little lean, stock, so the gold pipes might be "normal"....i think a little richer in the carbs fixes that

[SteveL-J]

I had a similar problem with my 82 750TZ (it would fade to an almost stall if I twisted the throttle too hard) Turned out to be one of the (#1 I think) carb's diaphragm was not seated properly and would get sucked in. Just thought I'd mention it.

[Fast Doc]

The bogging you describe is normal. On the GS the slides are mechanically tied to the throttle cable, no vacuum diaphrams. You have to modulate the flow with your right wrist. Once you get used to it it will seem normal.

[BassCliff]

Hee Haw Howdy!

Hi Mr. npntransistor,

Let it be known that on this day you are cordially and formally welcomed to the GSR Forum as a Junior Member in good standing with all the rights and privileges thereof. Further let it be known that your good standing can be improved with pictures (not you, your bike)!

Perhaps you've already seen these, but I like to remind all the new members. In addition to the carb rebuild series, I recommend visiting the In The Garage section via the GSR Homepage and check out the Stator Papers. There's also a lot of great information in the Old Q&A section. I have some documentation on my little BikeCliff website to help get you familiar with doing routine maintenance tasks (note that it is 850G-specific but many tasks are common to all GS bikes). Other "user contributed" informational sites include those of Mr. bwringer, Mr. tfb and Mr. robertbarr. And if your bike uses shims for valve adjustments, send an email to Mr. Steve requesting a copy of his Excel spreadsheet that helps you keep track of clearances, shim sizes and other service work.

These are some edited quotes from one of our dear beloved gurus, Mr. bwringer, with ideas on basic needs (depending on initial condition), parts, and accessories.
***********Quoted from Mr. bwringer************
Every GS850 (and most other models) has (or had) a set of well-known issues that MUST be addressed before you have a solid baseline for further troubleshooting. It's a vintage bike, and it's quite common (as in, every single GS850 I have had contact with) that there are multiple problems that have crept up and slowly gotten worse over the years. It's not like a newer vehicle, where there's generally one problem at a time.

These common issues are:

1. Intake O-rings (install NEW OEM or Viton only - common nitrile O-rings will quickly deteriorate from heat)
2. Intake Boots (install NEW -- these cannot be repaired)
3. Valve clearances (more important than most people think)
4. Carb/airbox boots
5. Airbox sealing
6. Air filter sealing
7. Petcock (install a NEW one)
8. On '79 models, install new points or Dyna electronic ignition (or at least verify that the old points are working correctly)
9. On all models, it's fairly common to have problems with the spark plug caps. These are $3 or $4 each, and often worth replacing if you're keeping the stock coils/wires.
10. Stock exhaust with NO leaks or holes -- good seals at the head and at the junctions underneath.
***********************************
Carburetor maintenance:

Replace the intake boot o-rings, and possibly the intake boots. Here's the procedure:

http://bwringer.com/gs/intakeorings.html

Here's an overview of what happens with this particular problem:

http://cycleorings.com/intake.html

You'll also want to examine the boots between the carbs and the airbox. There's a good chance these are OK, but check them over.
And finally, if things still aren't exactly right, you'll want to order a set of o-rings for BS carbs from the GS owner's best friend, Robert Barr:
http://cycleorings.com
Once you receive these rare rings of delight, then you'll want to thoroughly clean and rebuild your carburetors. Here are step-by-step instructions that make this simple:

http://thegsresources.com/gs_carbrebuild.htm

***************************************
OEM Parts/Online Fiches:

I would definitely double and triple the recommendations to use Cycle Recycle II and Z1 Enterprises as much as possible. These guys are priceless resources. Z1 tends to have slightly better prices, CRC2 has a wider range of goodies available. If you're near Indy and can bring in an old part to match, CRC2 has a vast inventory of used parts.
http://denniskirk.com - Put in your bike model and see what they have.
http://oldbikebarn.com - seems to be slowly regaining a decent reputation, but it's still caveat emptor. They don't have anything you can't get elsewhere at a better price anyway.
http://www.babbittsonline.com/ - Decent parts prices. Spendy shipping. Don't give you part numbers at all. Useful cross-reference if you obtain a part number elsewhere. Efficient service.
http://bikebandit.com - Fastest. Middlin' prices. Uses their own parts numbering system to obfuscate price comparisons -- can be very confusing for large orders. Cheapest shipping, so total cost usually isn't too bad.
http://flatoutmotorcycles.com - Slow. Cheapest parts prices, crazy shipping costs. Don't expect progress updates or much communication. Real Suzuki part numbers.
http://alpha-sports.com - Exorbitant parts prices. Different type of fiche interface that's quite useful at times, especially with superceded part numbers. Real parts numbers. Shipping cost and speed unknown due to insane, unholy pricing.

Stainless Bolts, Viton o-rings, metric taps, dies, assorted hard-to-find supplies and materials, etc:

http://mcmaster.com - Fast, cheap shipping, good prices. No order minimum, but many items like bolts come in packs of 25 or 50. Excellent resource.
http://motorcycleseatcovers.com - Great quality, perfect fit (on original seat foam), and available for pretty much every bike ever made. Avoid the textured vinyl -- it's perforated.
http://newenough.com - You DO have riding gear, don't you? Great clearances, always outstanding prices and impeccable service.
***************End Quote**********************
Additional parts/info links:

GSR Forum member Mr. duaneage has great used upgraded Honda regulator/rectifiers for our bikes. Send him a PM.
New electrical parts:
http://stores.ebay.com/RMSTATOR or http://www.rmstator.com/

http://www.ricksmotorsportelectrics.com/index.php

http://www.electrosport.com/

For valve cover and breather cover gaskets, I recommend Real Gaskets (reusable silicon):
http://www.realgaskets.com
The Rice Paddy (salvage/used)
http://www.ricepaddymotorcycles.com
Carolina Cycle
http://www.carolinacycle.com
Ron Ayers Motorsports
http://www.ronayers.com
MR Cycles
http://www.mrcycles.com
Moto Grid
http://www.motogrid.com
If all else fails, try this:
http://www.used-motorcycle-parts.org/
Used bike buying checklists:

http://www.amadirectlink.com/roadride/Riderresc/checklist.asp

http://www.clarity.net/~adam/buying-bike.html
Lots of good info/pictures here:
http://www.suzukicycles.org
http://www.cyclechaos.com/wiki/Motorcycle_Wiki
http://www.bikepics.com
Basic motorcycle maintenance/repair:
http://www.dansmc.com/mc_repaircourse.htm
Online Clymer manuals:
http://search.ebscohost.com/ Click on "Small Engine Repair" then "Motorcycles". User=library, password=library. Note: This link may not work if you are on a school campus.

Thanks for joining us. Keep us informed of your progress. There's lots of good folk with good experience here.

Thank you for your indulgence,

BassCliff
(The unofficial GSR greeter)