160 speedo, On my GS850GL

[mattyfz450]

I'm trying to put the speedometer off my '81 GS1100 parts bike on my '81 GS850. I swapped the speedo only and at 55mph (according to the tac) it was about 10mph slow. I had planned on this though, and had the drive gear off the 1100 so no big deal. Well I swapped those around today and I'm still 10mph off.

My first question would be, whether or not the '81 1100GL would have came with a 160 speedometer. It's a green background, with two bulbs instead of the one on my 850.

Also, the needle on the 160 speedo is bouncey. My stock 85mph speedo was nice and smooth, but the 160 is choppy with either drive gear or cable. Any suggestions?

Thanks for any info!!!

Matt Williams

[boris]

is their any difference in tyre sizes?

not bike related but tyre and speedo related

i fitted lwb rims and 750 tyres to my land rover
which is a swb and supposed to run on 550 tyres
the spedo went out good style by 15-20 mph
by fitting the lwb speedo to my swb i rectified the inacuracy

maybe if their is any difference in rim size it will cause the same problems as what i experianced

[mattyfz450]

Both bikes use a 100/90/19 front tire.

[boris]

Both bikes use a 100/90/19 front tire.

oh well bang goes my theory