clutch

[NJona86FJ]

ok im figuring that what im guessing is correct but asking for 2nd opinions.... when at about 6 grand in 5th throttle held at a constant.... the tacho is slipping up to 7 and back to 6... up to 7 and back to six.... figuring my clutch is slipping, or my tacho is possessed!!! bets on the clutch... my rear wheel has commuter strips in the middle but i dont think it s the rear spinning up...  any ideas?

[Dan Filetti]

Sound like you need a double up clutch spring -unless you recently switched to an automotive oil with additives that are causing this.  Rand @ RPM can get you sorted out.

Dan

[Arnie]

You should be able to hear the engine varying between 6 -7K rpms.
If you do, then as Dan says, your clutch is slipping.  Deal with that.
FJR spring is only $20ish from RPM Randy.

Cheers,
Arnie

[NJona86FJ]

yeah thats what i thought too.... that you would hear the engine picking up in revs.... i was tucked down over tank under screen and listening.... couldnt hear anything like that.... bugger it i will just do it anyway. got new tyres chains and sprockets coming through my good people at Inskipp Motorcycles so i will just get some oem plates... been meaning to do that for a while .... slackarse me an all that!! lol
cheers fella's

[Lotsokids]

Sound like you need a double up clutch spring -unless you recently switched to an automotive oil with additives that are causing this.  Rand @ RPM can get you sorted out.

Dan

Very good suggestion. If you double-up with a new spring, it's going to be pretty stiff to pull. I have big hands, so it's not too bad. If you are stuck in traffic a lot, it might be worth the money to buy an FJR clutch reservoir / plunger assembly. It has a larger diameter and easier pull.

[Dan Filetti]

so i will just get some oem plates...

For clarity, you want another clutch SPRING to stack on top of the existing spring [not plates].

Dan

[SlowOldGuy]

Very good suggestion. If you double-up with a new spring, it's going to be pretty stiff to pull. I have big hands, so it's not too bad. If you are stuck in traffic a lot, it might be worth the money to buy an FJR clutch reservoir / plunger assembly. It has a larger diameter and easier pull.

Just for clarity, the FJR mater cylinder is smaller diameter.  That's what gives the hydraulic advantage.

DavidR.

[NJona86FJ]

all good information... just spent 1000 bucks down the bike shop, new tyres chain sprockets and (sigh) a nice new helmet ( couldnt resist!!) will order the clutch plates and stuff next trip next week when i get tyres, mentioned the issue to bike guy behind counter ( elder gentleman, seems to know his stuff) and he mentioned something along the lines of  possible issue in the tacho unit itself due to age etc,  doesnt do it in any other gears, just 5th at that rev range... he also mentioned controlling said grumpies and slowing down a tad too... have heeded advice... was a pleasant day to tool around and not be nuts!
cheers again folks.

[andyb]

If it's slipping that badly going down the road, the fibers in the clutch are most likely shot, replacing them will probably fix it.  Atop that, replacing (rather than doubling) the original diaphram spring with a new FJR unit will help the replacement fibers last longer.  If you're desiring even more grip from the clutch, then go ahead and double things up.


Try to see if you can make it do it again.  Should definitely hear the motor spin up and down though.  I'm wondering if it's a vibration issue, likely speed related, which makes me think that replacing the rotating bits will eliminate the problem.

[racerrad8]

so i will just get some oem plates...

For clarity, you want another clutch SPRING to stack on top of the existing spring [not plates].

Dan

Here is the spring right here; http://www.rpmracingca.com/proddetail.asp?prod=Clutch%3AClutchSpring

If you want new frictions they are listed on the website as well.

Randy - RPM