GS850 1983 .This is a serious question

[Wingsconsin]

I finally got to ride my new to me 850.
I only got in about 25 miles ...it was 40 here today ..

But I really want to know What is going on when I hit around 5500 rpms...?

It feels like a 4 barrell carb just kicked in ...
the bike takes off and ...zooomm...

So someone please explain this to me ..seriously. ..

I just want to know

[Steel Toed Tank]

Because you are entering the part of the RPM band where all the horsepower is made.

Try riding some sweeping country roads without dropping RPM below 6500, it's like having a whole different bike.

[Nessism]

Maybe one of the pilot jets is plugged up or there is a spark problem, and one of the cylinders only fires at high rpm? Or maybe it's just the cammy nature of the engine as tank alludes.

[Dogma]

Entirely normal on the 850. Don't know why. Shape of the needles?

[850 Combat]

Maybe one of the pilot jets is plugged up or there is a spark problem, and one of the cylinders only fires at high rpm? Or maybe it's just the cammy nature of the engine as tank alludes.

This is most likely 850s are weak on mid range power, but yours sounds like the pilot circuit isn't working correctly

[Wingsconsin]

Thanks for the early replies....
Just to be sure to stay on track ...
I personally rebuilt the carbs ...I have done 6 sets of carbs in the past year from GS to CX to Goldwing and I know these are correctly set ..
Also .one of the better known GS advisors also checked over and tuned them ..
So I really think it is not carbs...

still ...my question remains ....

My son rode the bike and he said it was smoother than anything he has ridden and then the HP comes on with brute force....his "feeling" ...

Still welcoming thoughts and conversation...

Soon I will make a video of it ..but we are facing 4 days of rain next

[marvinsc]

Sounds like a typical 850 that is running well...........

[orourkei]

the brute force feeling is fun with my 650 =]

[Steve]

I don't know that anyone has fully explained exactly why it happens, we just enjoy it when it does.


You are correct, it does feel like a four-barrel carb kicking in, or variable valve timing on some of the newer cars, but we all know that none of those things were available on our 850s.


Dogma asked if it was the shape of the needles. Shape? What shape? The stock 850 needles start at 3.0mm right under the clip. Down at the tip, I have seen either 2.6 or 2.7mm. Not much of a taper, and it is consistent all the way down, so I don't think that's it.

Nessism and 850 Combat both though it might be a faulty pilot circuit. If that's it, then it has been that "problem" on EVERY 850 that I have ridden.

It's just the nature of the beast. Now get those Frogg Toggs on and go for a ride.

.

[GSX1000E]

As has been said before, just an average/good running GS850G.

[Grimly]

The cams reach their more effective rev range and coal starts getting shovelled through at a much better rate.

[mrbill5491]

My 750 hits its sweet spot on the cams around 4,800 rpm and pulls nicely up to 8,000 in 4th. Gotta keep that power band up there in 2nd, 3rd and 4th. 5th gear on my 750 is more for open stretches of hiway, not very useful in mountain twisties.

[Wingsconsin]

Some startling observations

Just to add more observations to the conversations...

1) 70 MPH in 2nd gear ...
2) 60 to 80 MPH in a blink ....



(This is going to be a fun ride! - Com'on Summer)

[bwringer]

Yep, dey all do dat. And it's a lot of fun.

Honestly, I've ridden a few examples of an 1100G/GL and a 1000G/GL, and the 850 is far more entertaining.

(Turn your sound down almost all the way... I didn't know how to set a level when I uploaded this.)

http://youtu.be/E1i8F3PCOQc?t=1m1s

http://www.youtube.com/watch?v=0sQVv8v79io

[koolaid_kid]

In cars, we call that "coming on the cam". It is really the shape of the cams, which are tuned for a particular range. I had the pleasure of riding bwringer's 850 a couple of years ago, and the mid-range hit is awesome.