1981 cb900f - the beast within

[nelbiz]

just picked up an 81 cb900f with 17000 on the clocks for $700, runs a little rough, just needs a re-jet.

plan on doing a few mods here and there, first ones will be clip ons and a cafe seat. still undecided as of the style of the seat unit, any opinions/suggestions would be great.

already removed the giant clunky air box, gonna replace with some k&n filters. rear brakes need a rebuild and a new chain/sprockets will be the very first duties.

for all of you 900 owners, are there any major problems/fixes that i should focus on immediately before i move on? and i have the whole tail unit in excellent condition if any of you are looking to repair/replace any thing.

will get some pics up shortly! btw love the site!

 

[VonYinzer]

Welcome to the fold man. Thats a big bike to cafe. Im sure youll pull it off though. Lookin forward to pics.

 

[nelbiz]

http://lh3.ggpht.com/_sZWSf3DGFq0/S61dcFyZ6bI/AAAAAAAAAFA/SHw4ZZZyORI/s640/Bikes%20024.jpg

http://lh4.ggpht.com/_sZWSf3DGFq0/S61dcdMNJvI/AAAAAAAAAFA/Q0nr1OCXGRA/s640/Bikes%20025.jpg

sorry for the bad pics, gotta take some updated ones with her all tore down.

 

[javspo0lin]

just picked up an 81 cb900f with 17000 on the clocks for $700, runs a little rough, just needs a re-jet.

plan on doing a few mods here and there, first ones will be clip ons and a cafe seat. still undecided as of the style of the seat unit, any opinions/suggestions would be great.

already removed the giant clunky air box, gonna replace with some k&n filters. rear brakes need a rebuild and a new chain/sprockets will be the very first duties.

for all of you 900 owners, are there any major problems/fixes that i should focus on immediately before i move on? and i have the whole tail unit in excellent condition if any of you are looking to repair/replace any thing.

will get some pics up shortly! btw love the site!

First error was removing the air box. It is ugly and takes up space but the carbs that are on that bike are vacuum operated and need the box to work properly. Trust

me I learned from experience and wasted my money on the stupid K & N filters because they gave my bike a lot of lag and power loss. If you wanted to run the pods get keihin cr carbs.

 

[notlob]

!st thing on the to do list would be to set the valve clearances to 0.005" for both inlet and exhaust. 2nd would be to check and clean every electrical connector in the wiring loom and especially the earthing points. 3rd check the charging system is working correctly. Without doing those basics steps you'll be chasing your tail trying to find any other faults you may have.

Get yourself the workshop manual. theres a link to a downloadable one on here somewhere. Perhaps that should be item 1.

+1 on the pods & airbox. You could try the HRS (HRC) modification on the stock carbs if you have to have pods, or fit GSXR Mikuni BST carbs people have more success tuning those than the stock CB carbs.