my 1100 feels slower than my 900

[showerfan]

Maybe it's a sprocket issue? 6th gear on the 1100 evo I just picked up is definitely useless. But for some reason, I have a much easier time getting to triple digits on my old 1999 m900 city.

I have this nagging feeling that efi sucks.

[RonB]

Don't think it's the EFI. My 2000 M900 EI feels a lot faster than my S2R1000.

[Speeddog]

Same transmission.
The 1100evo has an 8% taller primary gearset.
Final drive is likely different.

But that doesn't really matter, whichever bike is geared taller, you'll just hold it in a lower gear a bit longer.

Perhaps the 1100 is sick.

[showerfan]

the 1100 is brand new! just got it today.

also, me no speaka no engineering. what do you mean 8% taller? and why is sixth gear so toothless?

i noticed a lot of people go to a 14t front sprocket -- some have said it's geared the way it is stock to pass emissions. should i change front or rear sprocket to less or more?

help greatly appreciated 

[stopintime]

If it's a new bike, maybe triple digits shouldn't be a goal when it's being run in...

Many bikes feel 'slow' when they're new because they haven't yet been run in = metal parts don't move smoothly against each other.

There are gears between the crank shaft and gear box, primary gears - they work in the same way as gears in the gear box and final drive sprockets - deciding bike speed related to engine revs. Even before you start to operate the gear lever, or change sprockets, the Evo is 8% taller than the old 900. 'Taller'/'heavier' as in... 2nd gear is taller/heavier than 1st.

The gear box and sprockets being identical, the primary ratio differing 8% - your Evo needs minus 1 front tooth AND plus 1 rear tooth to get the same gearing as the 900. Then, in theory, it 'should' feel similar...  ..... which is a meaningless theoretical exercise since the engines are so different. Wait for the Evo to be run in and come to life AND/OR fix it if doesn't trash an old 900.

[koko64]

Was your old 900 modded for performance or a stock W head motor? From the specs, the evo1100 has higher comp, bigger valves, warmer cams and more capacity, but would have EPA gearing and jetting. If you put V heads on your 900 then it would probably have slightly hotter cams than the evo iirc, but still be down on comp, valve sizes, ports and of course capacity.
With the gearing and fuelling sorted, you'd think the evo should blow your old 900 into the weeds.

[showerfan]

break in?  i don't think so.

thanks guys! i'm ttaking it to the safety track tomorrow.

[the_Journeyman]

Gearing could be an area that makes the difference.  My 62HP M750 (+3 rear sprocket) leaves the line like a rocket but only has a top speed of about 110 now, if even that.  If your 900 has had a sprocket change, that could make the difference.  Also, if something is sluggish in the highest gear available, it doesn't concern me a whole lot.  That really tall highest gear may be for MPG numbers or similar. 

JM

[showerfan]

I realized tonight the sixth gear is only for 85+ mph

[SDRider]

I realized tonight the sixth gear is only for 85+ mph

6th gear is useless below 80mph.  14T front sprocket makes a world of difference.  First mod I did to my bike.

[Curmudgeon]

6th gear is useless below 80mph.  14T front sprocket makes a world of difference.  First mod I did to my bike.

Give it 1,500 miles too without melting the pistons. 

[ungeheuer]

At the same road speed...

my M1100 feels slower than my DR650 

[showerfan]

I realized tonight the sixth gear is only for 85+ mph

[Greg]

The M1100 is geared way too high, grab a 14T and it will make a big difference.

[Rudemouthsky]

This thread makes me feel better about going with a built 944 motor for my build. Although I have a feeling I'll be green with envy once Dub Luv finally finishes his FCR41>1000DS build.