Eccentric throttle pulley?

[lezsi]

Hello guys


I'm new here, and it seems a great site to me!


I have 2002 FZS-600, and thinking about adapting an eccentric throttle pulley from FZ-6 (or other?)


Is this doable? What do I need to swap?


The goal is to have smoother throttle response around idle and light loads, as it's a bit sharp to my (and my passenger's) taste.

[Dangle_kt]

I am about to ask a similar question - the bike is very snatchy at low speed pick up - I have to be SUPER careful with my throttle or its really jerky.


I can be going along at 70mph on the motorway in top, and the throttle is barely only a whisper - now I assumed it was down to poorly adjusted throttles and the unfathomable nature of a duel cable set up... but having read your post, maybe its just the way it is?


Anyone got anything to add to this thread I'll be interested to read of solutions

[griff86]

Have you had the carbs balanced since you've owned the bike? Also have you had the TPS reset. Both easy to do.
 
These make a big difference.

[limax2]

Welcome to the site lezsi and Dangle. I agree with griff in that if the bike is set up right there shouldn't be a problem. Also an over slack chain can also make it less smooth. Any fresh bike will take a little time to get used to. It's all a matter of getting used to the responce from the amount of throttle opening under different conditions. After a while it all just becomes natural. Having said that it is a fairly quick acting throttle compared to some other bikes.
Not much help in answering your question about changing the throttle I know, but just my opinion for what it's worth.
Dangle- On the level at a "constant" 70 mph in top only requires a small amount of the power available from the engine and hence it is quite normal to only be on a whisper of throttle.

[lezsi]

Thanks for your answers!


My bike has a fresh valve clearance set and carb adjustment/sync. The chain seems to be on the stiff side.
The only cure I've found so far is raising idle RPMs to the 2k range which made the engine brake effect somewhat weaker.


Checking the TPS however sounds a clever idea, -if there's a setting when the ECU gives less ignition advance.


The eccentric pulley idea came to my mind from the new FZ6 specs, where Yamaha addressed the problem this way.


I definitely need some time first getting used to the new bike (especially after a two-stroke yam with virtually no engine brake  ), and watch out for potholes to avoid sudden changes to deceleration every time I hit them 

[Motorbreath]

Dude get the idle back to standard. It will overheat the engine among other bad consecuences.

Try to get used to its response. Many people like it, even people who do not own a FZS. It was also one of its stronger points in magazine reviews. It is much more satisfying than the FZ6.

Also it is possible the mechanic did the adjustment wrong. Try another FZS to compare.

[kebab19]

Perhaps try this mod? Originally for the 1000, made a slight difference to mine. Buy a spare throttle tube off ebay & Dremel away....

http://www.yamahafz1oa.com/forum/showthread.php?p=2019261#post2019261

[lezsi]

Perhaps try this mod? Originally for the 1000, made a slight difference to mine. Buy a spare throttle tube off ebay & Dremel away....

http://www.yamahafz1oa.com/forum/showthread.php?p=2019261#post2019261

Wow, this is the one I'm looking for!
-it's grinding time soon, thanks! 

[ratfazer]

Do you have the throttle cables adjusted correctly?  I know that, when one of the cables hasn't the correct amount of play pulling away can be a bit snatchy and erratic.