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flat spot after half throttle in 5th and 6th gear

Dwahl

Dwahl

Husqvarna
AA Class
Hey guys, just rode from Vancouver island down to northern California and back, and on the the ride i noticed my 2007 te 610 has got nothing left in the upper gears. im running 15 tooth front and 42 tooth rear. could it be becuase the gearing is higher then stock?

bike has 34,000 km, HMF exhuast and i pulled the flame arrester screen from the air box. im running stock jetting with a 178 main and the clip in the 5 position from the top.

elevations is sea level to about 200 meters in day to day riding.

do you think a jd jet kit would help? anyother ideas?

thanks guys
 
Its not because the clutch is slipping is it ? That usually where you notice it , trying to pull hard 5/6 gear under load .
Jetting will be noticed by throttle position regardless of gear - so if it feels flat in 5/6 gear up top if jetting was wrong you would also notice it in the other gears .
It may be that you gesring is too tall and it doesnt want to pull it .
 
Did this just start or has it always been like this?

15/42 is stock on a 630, not sure on 610...

.
 
could be clutch related, to my knowledge it has never been changed. do you know how long they are supposed to last?... and the stock gearing for the 610 is 15-45 so it could also be because i changed the rear to a 42. and it doesn't have the guts to pull but i find that hard to believe. ( or i want to find it hard to believe)

on acceleration i dont think ive ever taken the bike past 6500 rpm, even though its supposed to rev to i believe 8500? never really had to and i dont even think it would go that high it vibrates alot past 6500.
 
I have found that I have to periodically (like every 6 months) bleed excess clutch oil from the master by cracking the cap screws loose and bleeding out a few drops. This is the volume created by clutch wear allowing the clutch rod to sit deeper in the slave.
If I don't I end up with a small amount of clutch slip in certain conditions.
 
610 has cable actuated clutch.

If the clutch slips you will notice that under significant acceleration the engine will increase in RPMs but the bike will not accelerate or change much in speed.

I'd ask the same question Bob asks.
 
Fast1 said:
610 has cable actuated clutch.

If the clutch slips you will notice that under significant acceleration the engine will increase in RPMs but the bike will not accelerate or change much in speed.

I'd ask the same question Bob asks.
Click to expand...


In the same vein, if the cable is adjusted too tight, or the clutch has worn and the cable has become tight, that could cause the same issue.
 
checked the clutch cable and its just right, i cant remember if this was always the case, ill take it out for a ride and see.

but as far as what it could be: gearing or clutch, can i rule out jetting or would a jd jet kit help in the long run?
 
I would rule out jetting as that does not make sesnse . You havent changed to a different oil ?
I would say considering the k's you are due for new plates .
Warm the bike and test it in 5th .. Get up to descent cruising speed back off and on the accelerator hard, you should notice it slipping .

New friction & steel playes are a very easy fix . I think its 7 friction to 8 steel and you want to give them a good soak / bath in oil before putting in . One of the lads on adv needed new plates on his 610 and he had 20+ k's
.
 
I've got 15k miles on my 630, i clutch up all the time and the plates are still well within spec. I guess if you do a lot of technical offroad, slipping the clutch, it would wear faster.
 
the bike,has seen alot of riding conditions from extremely tight single track, motocross tracks, to highway cruising, i think it may be time for a new clutch. ill do as you said and do the slip test, thanks guys!
 
Wait, how did you guys go from "flat spot in 5th and 6th" to "clutch issues"?
To me a flat spot means the bike isn't picking up RPM. A slipping clutch would have the opposite effect, with the engine revving up but the bike not picking up any speed.

Seems to me the bike is geared wrong, or the engine is losing power.
 
yes in this case the bike isnt reving up at all, after half throttle nothing really happens, and i did check the carb, and it is working properly
 
I thought we were dealing with two different issues here... It's probably due for a clutch, but the loss of power on the highway could be as simple as a clogged fuel filter/sock.
 
Dwahl said:
yes in this case the bike isnt reving up at all, after half throttle nothing really happens, and i did check the carb, and it is working properly
Click to expand...

I'm not familiar with the carb'd bikes, are they CV type carb with a vacuum slide?

How's the condition of your cam chain? Could it have jumped timing?

I'm still not clear on whether the bike has always done this or did it start suddenly?

.
 
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