New and need some advice ..exhaust and fuel

[Guest]

Hi guys

Have just purchased a 1983 katana M and have done some work to it and got is riding fine
the one problem is when you rev over about .4.5 5000 RPM the bike seems to bottom out
and loose power .

I was thinking maybe bigger jet size ?

any Ideas on this be great .. and great site as well so much good information !!

cheers

[chuck hahn]

List ALL the maintenance you have done WITH exacting details.

And first thing I was suspecting is that your gonna say cleaned the carbs. With what and HOW??

If it wasnt per following this tutorial..your carbs are not clean and need be to ensure thats not the problem. I am assuming you have the BS (CV ) carbs...

http://www.mtsac.edu/~cliff/storage/gs/mc_maint/GS_CV_Carb_Cleaning_Series.pdf

[chuck hahn]

OOPS...Just saw this is your first post so you couldnt have seen the tutorial. Anyway here the best little website your ever gonna have in your favorites files.

http://members.dslextreme.com/users/bikecliff/

And DO NOT go buying any aftermarket "rebuild kits " full of useless crap. All you need for the carbs is some carb dip, that tutorial, and some orings from our member Robert Barr. His little place has all you need for rebuilding carbs in 1 tiddey kit. 1 kit per full rack. And go to page 3 for the intake manifold orings to ensure the entire system is full of fresh new orings and at optimal health.

http://cycleorings.com/

[tom203]

While you're reading, take and send pic of bike. Maybe some previous owner mucked with intake system . Does this thing have a air filter element installed?

[Steve]

Hi guys

Have just purchased a 1983 katana M and have done some work to it and got is riding fine
the one problem is when you rev over about .4.5 5000 RPM the bike seems to bottom out
and loose power .

I was thinking maybe bigger jet size ?

any Ideas on this be great .. and great site as well so much good information !!

cheers

Yes, ideas would be great, like ...
- what changes have been made to
- what maintenance has been done
- stock intake or pods
- stock exhaust or header

Yes, we do have a bunch of good information available, but we need to know what we are working with.

.

[trippivot]

go out and ride it -- at the same time while the problem you are having - open the choke/enrichener a little and close it - how it reacts will tell you if it needs more gas or not . you really want the enrichener to kill the engine with too much gas because you are already getting enough through the standard circuits. -- if it runs better you need more gas.


double check your ignition advancer unit -- it has to turn easy forward and snap back.