GS1000 full choke RPM?

[Guest]

I recently bought a 1979 GS1000. When I start the bike cold by pulling the choke cable all the way out, the bike starts then the RPM's go up to
3,000 RPM and stays there. If I push the choke down about half way it slows down but wants to kill. So I pull it out all the way again and it starts right back up. It just seem to me that 3,000 RPM is high for a cold engine. Any thoughts? Thanks, Doug

 

[fbody_mike]

3K RPM is high for an old V8 at warmup, but not for an inline 4 Japanese motorcycle engine. Most of my motorcycle warm up like this, then 30 seconds later I drop the choke to 1/4 and ride off, as long as the throttle responds. Just take it easy until its fully warmed up.

Summer mornings, I will tend not to give it full choke, maybe 1/2, but colder winters needs more choke. But again, 3K RPM wouldn't worry me one bit.

 

[rphillips]

When it starts, the RPM should keep rising as the eng. warms up. Keep reducing the choke, gradually, to keep RPM around 1100 or 1200. When completely warm should be at appx. < 1000 RPM.

 

[Sandy]

When it starts, the RPM should keep rising as the eng. warms up. Keep reducing the choke, gradually, to keep RPM around 1100 or 1200. When completely warm should be at appx. < 1000 RPM.

And once you get to using the choke under all but extremely cold starts you may only need about 1/2 choke to begin with thus avoiding that initial surge in RPM.

 

[Steve]

If you start at full "choke" and SLOWLY back it off, do the revs drop right away or do they climb a bit first? On my bikes, I have found that about 1/2 "choke" is where they run the best, as full "choke" is too much. I have a mental note where that point is on each bike and start there. Even when starting at that point, the engine speed will rise a bit as the engine warms up in a few seconds. Once it's stable (at about 2000 RPM) I'll put on my helmet, get on the bike and ride off. By the time I'm in third gear, the "choke" is turned off completely.

.

 

[Big T]

I recently bought a 1979 GS1000. When I start the bike cold by pulling the choke cable all the way out, the bike starts then the RPM's go up to
3,000 RPM and stays there. If I push the choke down about half way it slows down but wants to kill. So I pull it out all the way again and it starts right back up. It just seem to me that 3,000 RPM is high for a cold engine. Any thoughts? Thanks, Doug

Completely normal behavior. Let it run at 3k until you hear a slight increase in rpm, then start reducing the amount of choke.
The majority of responders here different carbs
No harm will come to the engine, says the guy with 80,000+ miles on his 78 GS 1000

 

[Guest]

Completely normal behavior. Let it run at 3k until you hear a slight increase in rpm, then start reducing the amount of choke.
The majority of responders here different carbs
No harm will come to the engine, says the guy with 80,000+ miles on his 78 GS 1000

OK, thanks guys for all the info, I won't worry about the 3,000 RPMs now.

 

[Rob S.]

My '82 1100E "starts instantly on full choke, with the tach quickly hitting 4500 and rising unless you back off the choke." (Cycle World).

It is proper to idle the engine at no more than 2000 to warm it up, according to my owner's manual.

 

[chuck hahn]

Big T is the winner

 

[rphillips]

I love this place, always learning something. Is there a reason to let them warm up under higher RPM's? Is there a disadvantage to keeping them under 1500 while warming up?

 

[Rijko]

I love this place, always learning something. Is there a reason to let them warm up under higher RPM's? Is there a disadvantage to keeping them under 1500 while warming up?

I always keep RPM at approx. 1500 while warming up with the GS1000,
feels like 3K is harder on a cold engine to me.

 

[chuck hahn]

No advantage...but no harm either. Thats just how fast she wants to rev based on the amount of fuel delivered via the enrichment circuit. Some may be around as much as 4G too.

 

[Grimly]

I've always let it start, get stable and immediately start dropping the revs to around 2k. Revving a stone-cold engine up is asking for trouble.

 

[Big T]

No advantage...but no harm either. Thats just how fast she wants to rev based on the amount of fuel delivered via the enrichment circuit. Some may be around as much as 4G too.

Yep, mines always been that way, bought it new

 

[KEITH KRAUSE]

Personally, I'd never warm up my '79 GS1000 at 3,000 rpm's. If the carb's pilot circuits are reasonably clean, why would you have to pull the choke up that high to keep it running? I realize "pulling the choke all the way out " as Doug says, can result in varying rpm's because of choke cable adjustment and outside temperature. I suppose I could see pulling it up that much for the purpose of starting just for a couple seconds then immediately lower the rpm's to no more than 2,000 and that much rpm's should only be needed in very cold weather. I just don't know why you would subject a cold engine to that much rpm's as a routine, when, for example, my 1000 might need the choke pulled up high enough that the moment it starts, the rpm's can hit 3,000 but I immediately lower the rpm's to about 1,800 in cold weather. I also turn off the choke as soon as I can. This motor has some very small oil passages and the oil pressure I believe is only about 6-8 PSI. Cold 10W40 oil is too thick to flow well at 3,000 rpm's.
The factory owners manual for the '79 1000 states "to try to limit the rpm's to 2,500" and I was surprised it said that high. Maybe I just "baby" my GS too much. My reply also focuses on Doug saying his bike wants to kill if the choke is closed about 1/2 way. Again, cable adjustment and outside temp's factor in. I just want to add that the bike may be relying too much on the choke because the pilot circuit may not be operating as it should.

 

[Big T]

Yeah, but how often did you go riding in 40 degree temps?

Also, the GS will run for 5 miles with no oil in it and keep running for another 40k miles. AMHIK

 

[Spyder]

Mine would start up (with the "choke" on) and ramp up to around 3500. I would immediately adjust it down to around 2000. While gearing up (gloves, helmet, zip, etc), I would have to adjust a couple times as the rpm's will keep climbing as it warms up. By the time I was ready to climb on, it was ready to go without "choke"... My GSXR is about the same.

 

[Rijko]

Where's this going guys ?

T, Chuck, it is starting to sound like you advocate warming up a stone cold engine at 3000-4000 RPM ... Really ?

 

[rphillips]

I don't think it's going anywhere except to show it really doesn't matter how we do it. Whatever works for you seems fine.

 

[Guest]

Personally, I'd never warm up my '79 GS1000 at 3,000 rpm's. If the carb's pilot circuits are reasonably clean, why would you have to pull the choke up that high to keep it running? I realize "pulling the choke all the way out " as Doug says, can result in varying rpm's because of choke cable adjustment and outside temperature. I suppose I could see pulling it up that much for the purpose of starting just for a couple seconds then immediately lower the rpm's to no more than 2,000 and that much rpm's should only be needed in very cold weather. I just don't know why you would subject a cold engine to that much rpm's as a routine, when, for example, my 1000 might need the choke pulled up high enough that the moment it starts, the rpm's can hit 3,000 but I immediately lower the rpm's to about 1,800 in cold weather. I also turn off the choke as soon as I can. This motor has some very small oil passages and the oil pressure I believe is only about 6-8 PSI. Cold 10W40 oil is too thick to flow well at 3,000 rpm's.
The factory owners manual for the '79 1000 states "to try to limit the rpm's to 2,500" and I was surprised it said that high. Maybe I just "baby" my GS too much. My reply also focuses on Doug saying his bike wants to kill if the choke is closed about 1/2 way. Again, cable adjustment and outside temp's factor in. I just want to add that the bike may be relying too much on the choke because the pilot circuit may not be operating as it should.

Keith, some good logical thoughts here that I will use in my start up regime. Getting to know the bike. Doug