More bottom end

[mooks420n]

I have a 1981 GS 1100EX ,runs good etc., The bike pulls slow but steady up to about 5- grand then it really starts to groove, the prob is that by the time power-band kicks in I am moving over one hundred miles an hour and things start happening way quicker.
The bike is totally stock except for the 4 into1 hindle exhaust. how can I get more bottom end? I've read somewhere to advance the timing to 15 degrees,but unsure how to go about it. I have read that the canadian ex's were tuned mild, what are the stock timing settings?So how much more do I need to advance it?And how?
Over the winter I am planning on freshening up the beast with new rings carb rejetting (or possibly a carb swap if I can find some 36mm flats),and thinking of possibly going electronic ignition(any cons?) but my main concern is more snap off the bottom,so any advice will be greatly appreciated thanks in advance

 

[focus frenzy]

your 81 1100e already has electronic ignition.

a switch to the cams from a 83 1100E would help the low end power.

the peaky power band is normal for a GS.
the stock electronic ignition is not adjustable without modifications.

 

[mooks420n]

your 81 1100e already has electronic ignition.

a switch to the cams from a 83 1100E would help the low end power.

the peaky power band is normal for a GS.
the stock electronic ignition is not adjustable without modifications.

Thanks F F ,

Had a feeling it was electronic just had not looked yet,Will going aftermarket (Dyna) ignition make much of a difference? The bike runs fine with the stock.

The cams can bolt right on without any mods or part changes I can assume? thanks again

 

[focus frenzy]

they will go right in, but you may need the cam sprockets.
cross referencing the part numbers will tell for sure.

carb re-jetting will be needed.
the 83 cams have .5mm more lift and the intake cam is advanced faster.

more low-midrange grunt and a bit more on top!\\/

a aftermarket ignition might help, my 83 1100E originally had the second generation system that advanced the timing electronically, but when I bought it, it had been changed over to a Dyna S system with mechanical advance.

 

[Billyboy]

I have a highway rear sprocket, and it really steals the starting grunt. Now that I live in town I'll be switching back to the 42 tooth.

 

[Guest]

http://cgi.ebay.com/ebaymotors/ws/e...m=110037992408&ih=001&sspagename=STRK:MEWA:IT
Adjustable cam sprockets\\/

 

[mooks420n]

So are the cams cams a nesessity? looks like it will be a jetting thing, any ideas on the jets I should try first?(stock 34 mm) How can my timing be adjusted? by going the dyna S route with mechanical advance? I appreciate the help, will help formulate a game plan over the winter.

 

[80GS1000]

I have a highway rear sprocket, and it really steals the starting grunt. Now that I live in town I'll be switching back to the 42 tooth.

I agree with Billyboy. Are you running the stock gearing? You may want to change your sprockets to give you more acceleration on the bottom end.

 

[SqDancerLynn1]

Degreeing the cams to 106* seems to be the best seting sugested. points,dyna, or stock elect Makes no difference if they are working properly

 

[mooks420n]

Degreeing the cams to 106* seems to be the best seting sugested. points,dyna, or stock elect Makes no difference if they are working properly

this is for the stock cams? is this machineing or a setting? thank you

 

[rphillips]

A smaller collector on a 4 into 1 exaust will create more torque (bottom end power). V&H 4 into 1 pipes, years ago, came with 3 reducers that fit in the collector. They were 1 1/4", 1 1/2", 1 3/4", & the pipe was 2" with no reducer. The smaller the collector, the more torque, & less top end, the larger the collector, the more high rpm power, but less torque. I just went out to the garage & measured the collector on my Yosh pipe, it is 3", really made for max. top end, but I have made a reducer for it that is 1 1/2", cause I love torque, use torque all the time. The older I get, I use the high rpm power less & less & less & less.

 

[KEITH KRAUSE]

Degreeing the cams to 106 is a good compromise between low/mid-range torque and top end power. The powerband is wider and more usable. 104 even better if you really want the most torque. You'll need adjustable sprockets or slot the existing sprockets with a Dremel/file.

 

[mooks420n]

Is there some easily accessible literature on degreeing the cams ? I am not sure what it entails thanks again for all the info . M

 

[mooks420n]

ok got it


hxxx://www.starracing.com/Cam%20Lobe%20Center%20Explained.htm

 

[mooks420n]

your 81 1100e already has electronic ignition.

a switch to the cams from a 83 1100E would help the low end power.

the peaky power band is normal for a GS.
the stock electronic ignition is not adjustable without modifications.

my gs mechanic says my ignition has a timing plate and springs/weights he has an 1980 gs1100ex is ignition different on my 1981 1100ex? what mods need to be done to stock ignition?

 

[jpaul]

How long have you had this bike? I know the 1100's really start to pull at 6 grand, but they're still strong from 2500 on up. It almost sounds to me like you have partially blocked carb passages. I'd be tempted to run a couple of tanks through with a heavy dose of Sea Foam in the gas, just to see if it starts to improve from that.

 

[Hap Call]

my gs mechanic says my ignition has a timing plate and springs/weights he has an 1980 gs1100ex is ignition different on my 1981 1100ex? what mods need to be done to stock ignition?

The springs and weights are used advance your ignition curve as the motor builds RPMs...but it is still a electronic ignition. They are the same on the '80 and the '81 if they are both stock.

If you have an aftermarket exhaust but the stock jets are still in the carbs, you may find that all you need is rejetting. I don't agree with the statement that the GS is a peaky motorcycle, in fact, the GS1100E motor is considered a torque monster and pulls strongly from 2500RPM up through redline.

Hap

 

[mooks420n]

I will be re jetting and synching the carbs over the winter if I cannot find some 36mms,. also am looking for good stock exhaust to get my collector's plate, so that will dictate when i fiddle with carbs. So can I advance the ignition in my ex or not? with the plate you would figure it could be advanced as long as plate is slotted. thanks for the info btw : )

 

[Steve]

If you are looking for more bottom end, I think you will be disappointed when you install the 36s. The larger throats will not be as responsive to throttle changes at lower RPM, so will tend to make it even doggier. Stick with the 34s, make sure they are clean and jetted correctly.


.

 

[Jethro]

Something is wrong. On both of my 1100's I can easily crusie around at 40mph in 5th (about 3k rpm or less) and still have gobs of torque to roll on to light speed in a snap. These bikes make massive torque at anything over 3500 rpms.

As Steve said, larger throttle bodies will only increase your top end power, and not by much without other mods. I have heard good things about degree-ing the stock cams on all the 1100's.

The springs that Hap talked about should be checked. I had one break and it was advancing too quickly. That made the bike miss like crazy down low, but once above 2800 rpm it took off. Also, the advance unit should be lubricated now and again. Check that out too.

Make sure your charging system is working well. I had a stator that had one leg burned out, so it was only charging above 5000 rpms. That made it seem doggy down low, but still rip up high.