High Revs, but no power?

STCPO

STCPO

Pete
Joined
Dec 8, 2004
Messages
86
Location
McKinney, Texas
This one is going to be hard to explain. Overall my ST runs perfect. However, I really have not been riding it a lot the past two months due to the fact I'm having to much fun on my GS. Anyway, today on a 200 mile run for pie, I noticed when I accelerate hard, the RPMs almost red line, but the power is just not there. After a second or two, the power will kick in and the RPM's will drop back down to what I would expect for a normal hard acceleration. If I slowly roll on the power, I don't get the same results.

The bike idles fine, it's just when I crank on the throttle hard. It's not as noticeable at lower gears, but it's still there.

Any ideas? Bad gas? Dirty injectors? Dirty air filter? She's got just under 48K miles on her now.

Cheers,
Pete
 
No expert here, but it sounds like a clutch slippage issue to me. If I had this happen with a cage, that's where I'd be looking.
 
If you're nailing the throttle and RPM's increase but your speed doesn't then the clutch is slipping. Could be wear, could be the type of oil you're using if it has any friction modifiers in it, could be clutch springs are weak.
 
Would old/bad clutch fluid do it? Easy enough to change.
 
Grrr...I really hope it's not the clutch. Joe if it is, I have a project you can help me with :)

I'll change out the fluid tomorrow and see if that helps. If not, then I'll change out the oil. I did switch to Shell Rotella my last oil change, but I've ridden the bike a few times since then. Not to mention other folks are running the same oil.

I'm heading to Florida next week and it looks like I'll be taking the GS if I can't get this fixed before then.

Cheers,
Pete
 
Clutch disks are slipping .
More you do it , the worse it will get. Fast deterioration

These bikes use a wet type clutch , the disks are immersed in oil , using too slippery of an oil can cause this.

As mentioned, It's possible that using the wrong type oil can cause this and you could try changing the oil to a known acceptable oil.
 
'Nother vote for clutch slippage. What flavor of Rotella did you use?

Also, near the redline isn't where the go-fast is. Torque peaks at about 6,250 RPM and drops off from there. By the time you get above 8,000, it's down to almost what it is at 3,000.

--Mark
 
Yeah... could it be you're so used to the hi-revs of the GS 800 that you're having a hard time going back to the ST? I've never ridden that bike so don't know much about it but I've heard those that have ridden the Triumph 800 and say it's a hi-reving bike.
 
DRAT! I should have done a better search before I posted this. I just found a thread discussing how Rotella T6 has caused clutch slip for some owners. Guess what I put in the bike. My budget has been pretty tight recently, so I decided to try to save a few pennies. Well we all know how that turns out sometimes.

I'm switching back to Mobile 1 this week and I'll let you know how things go.

Cheers,
Pete
 
Mellow said:
Yeah... could it be you're so used to the hi-revs of the GS 800 that you're having a hard time going back to the ST? I've never ridden that bike so don't know much about it but I've heard those that have ridden the Triumph 800 and say it's a hi-reving bike.
Click to expand...

It is, but not like this. At first I thought maybe it was the fact I was not used to it anymore, but there is definitely an issue. The ST is probably ticked off at me for riding the GS so much.

Cheers,
Pete
 
The fluid and oil are easy.. A couple here have done clutches, might be fun to jump into but would prefer it wasn't that.
 
STCPO said:
DRAT! I should have done a better search before I posted this. I just found a thread discussing how Rotella T6 has caused clutch slip for some owners.
Click to expand...

That particular bike was 14 years old and might have had weak clutch springs. Yours isn't old enough to be having that problem. T6 says it meets JASO MA which, as Dave D. pointed out, harps on suitability for wet clutches.

My only other thought is that maybe the hydraulic system took on some air and isn't behaving, but that usually results in the clutch not disengaging properly, and the springs should overcome that anyway. When was the last time the fluid was changed and the clutch bled?

--Mark
 
I never did like Rottella in the ST, although it worked really well in my '86 VFR, and 1998 SuperHawk. I've stuck with MC mobile1 or MC Castrol.

:tc1:

Tom de
 
Well changed the oil back to Mobile 1 this afternoon and took her out for an aggressive ride to my Thursday night coffee. Sadly the clutch is still slipping (I really did not expect the oil change to improve anything). This weekend I'm going to bleed the clutch just in case, but looks like I'm going to have to crack the case open.

Now my real question for the masses of wisdom here. Since I am more than likely going to have to replace the springs, should I just go ahead and replace the plates while I'm in there. The bike has just under 50K on her and I plan to keep it till the wheels fall off. Not sure if it's worth it to replace everything now or just wait for the natural process of the plates wearing as well.

Keep your eyes open for an upcoming Clutch Tech day in North Texas. Should be sometime after the kiddo graduates in a few weeks.

Cheers,
Pete
 
Pete,

If you pick up the plate make sure you don't open them before you measure your existing plates.
I know of no one (I don't know about LEOs!) that has needed to replace the plates; but, of those that were having the issue everyone needed to do the springs.

So... you might end up returning the plates... check return policy and restocking fees!!!

Good luck,
Mark
 
Now remember Blrfl the real fun doesn't srart on a 1300 till the rpms get above 6200 !! Into the woo hooo range! !
 
New clutch fluid did not solve the problem either. All the easy stuff is done. Ordering new springs tonight.

Cheers,
Pete
 
Can someone sanity check me please. As far as I can tell, this is what I need to order to replace the springs.


Set of six new clutch springs

Front crankcase gasket Part # 11394-MCS-000

2 "O" rings Part # 91301-MCS-A10

Water pump gasket Part # 19226-MCS-000 <<<< This one I'm not really sure of. It's hard to tell if I really need to pull the water pump cover.

Also, if there is anyone on the list that has actually done this on an ST1300 it would be great if I could actually talk to you on the phone and get some words of wisdom from you before I start.

Thanks

Pete
 
You must log in or register to reply here.
Back
Top Bottom