Change in torque

[GPRIDER]

Has anyone noticed the change in torque values on a some of the bolts from Gen I to Gen II FJRs. I got my new service manual the other day and was doing some comparisons when I started seeing differences in the torque for the same bolts. Anybody know the reason the Gen I torque on some bolts is lighter than the Gen II? I was using my old service manual to torque similar bolts on my new 08 till I got my new manual. I'd have to say I may have over torqued some of them.

GP

 

[El Toro]

Without knowning which bolts, it would be hard to say. If they're the same thread, the same lube spec, and the same bolt grade, going into the same material on the female side, with the same washer or gasket strategy, then differences in spec could be due to error, or due to a change in philosophy based on experience of bolts loosening, or failing in service. Take a look at the parts microfiche at a place like https://www.mrcycles.com and you can compare bolt part numbers. If they're not the same, then they're probably not the same bolt.

 

[GPRIDER]

Without knowning which bolts, it would be hard to say. If they're the same thread, the same lube spec, and the same bolt grade, going into the same material on the female side, with the same washer or gasket strategy, then differences in spec could be due to error, or due to a change in philosophy based on experience of bolts loosening, or failing in service. Take a look at the parts microfiche at a place like https://www.mrcycles.com and you can compare bolt part numbers. If they're not the same, then they're probably not the same bolt.

Here's one of several examples I noticed. The three bolts that hold down the T bar under the gas tank are shown to be 56 ft. lbs. in the Gen I manual for my 04. The same bolts for my 08 in my new Gen II manual shows them to be 27 ft. lbs. That's half of what it was. I just checked your link and the part numbers are the same for both years along with the washers they use on both years. Just very curious at what Yamahas thinking is behind this.

GP

 

[Capt. Bob]

Without knowning which bolts, it would be hard to say. If they're the same thread, the same lube spec, and the same bolt grade, going into the same material on the female side, with the same washer or gasket strategy, then differences in spec could be due to error, or due to a change in philosophy based on experience of bolts loosening, or failing in service. Take a look at the parts microfiche at a place like https://www.mrcycles.com and you can compare bolt part numbers. If they're not the same, then they're probably not the same bolt.

Here's one of several examples I noticed. The three bolts that hold down the T bar under the gas tank are shown to be 56 ft. lbs. in the Gen I manual for my 04. The same bolts for my 08 in my new Gen II manual shows them to be 27 ft. lbs. That's half of what it was. I just checked your link and the part numbers are the same for both years along with the washers they use on both years. Just very curious at what Yamahas thinking is behind this.

GP

Might be the Gen Is vibrate more

 

[GPRIDER]

Funny you should mention that. This new 08 has more vibes than my 04 did. I even checked the sync on the throttle bodies. Still more vibes. Anybody else got any ideas on the torque?

GP

 

[phil]

It's because of the devaluation of the U.S. dollar to the Yen. (Sorry, the rum made me say that.) Your observations are puzzling.

 

[El Toro]

Looking at the bolts he's mentioned, the new spec makes more sense just based on what you'd expect for a bolt of that size in a static application.

There's still the issue of the material for the female threads, and the lube spec. The earlier torque spec seems like gross overkill on cursory examination.

 

[GPRIDER]

Unless Yamaha changed the kind of aluminum material for the Gen I frame it should be the same as the GEN II. Don't know about lube specs. Interesting that there is that much difference in torque though.

GP

 

[Fred W]

My guess is Yammi messed up on the first go 'round and the new specs are the right ones.

Most semi intelligent folks aren't torquing the T-bars or oil drain plugs to spec on 1st gens.

 

[Constant Mesh]

The T-bar torques were previously discussed.

https://www.fjrforum.com/forum//index.php?s...=103122&hl=

Techs at Yamaha's California headquarters verified that the torque change is correct for the newer FJR's. They said the values in the service manuals are correct.

 

[Fred W]

The T-bar torques were previously discussed.
https://www.fjrforum.com/forum//index.php?s...=103122&hl=

Techs at Yamaha's California headquarters verified that the torque change is correct for the newer FJR's. They said the values in the service manuals are correct.

Yes, but did they confirm that the old (higher) spec on 1st gens was also correct? And if so, why is it needed?

There was no consensus or resolution on the prior thread either.

 

[Constant Mesh]

Yes, they said the higher value for the earlier models was correct. They didn't offer an explanation for the change but said both values were correct for the respective bikes.

I've used the higher value on my '04 several times and I haven't noticed any thread distress. I do use a torque wrench so I don't exceed the recommended value.

 

[Fred W]

Yes, they said the higher value for the earlier models was correct. They didn't offer an explanation for the change but said both values were correct for the respective bikes.
I've used the higher value on my '04 several times and I haven't noticed any thread distress. I do use a torque wrench so I don't exceed the recommended value.

I think I did last time I had it off too.