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Service Bulletin: Belt Tension
- Thread starter jeff0110
- Start date
Rando
New member
By the way PRIOR to the service bulletin, the Technical Update to the original Shop manual listed the following Newtons as the proper belt tension:
Adjust the belt tension with the suspension completly unloaded to 900 +/- 75 Newtons (70 degrees F).
Recheck the belt tension with the vehicle on the ground and verify that the belt tension is 1150 +/- 100 Newtons (70 degrees F).
Adjust the belt tension with the suspension completly unloaded to 900 +/- 75 Newtons (70 degrees F).
Recheck the belt tension with the vehicle on the ground and verify that the belt tension is 1150 +/- 100 Newtons (70 degrees F).
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NancysToy
Motorbike Professor
Yes, and in the RT manual it was 750 Newtons. The original GS manual was 1500. They seem to have been revising it steadily downward.
BajaRon
Well-known member
Just my 2 cents but I would not adjust your belt to 101 lbs. by the Krikit. While 101 lbs. would be correct conversion from Newtons, we do not know yet what corrilation there is between the gauge used by dealers specifically made to measure tension in our belt and the reading we will get from the Krikit for the same tension.
In other words, just because the Krikit says you have 101 lbs. of tension does not mean you are in spec.
We really need to do what Scotty says. Get a properly adjusted belt and then test it with the Krikit and see what it reads. Lamont said his Krikit read 180 lbs. after having his RT adjusted to the new spec. Either his Krikit was reading high or the tech set his belt tighter than current spec.
It really does not matter if the lbs. on the Krikit corrilate exatly to Newtons. What matters is the reading that a properly adjusted belt will give on the Krikit.
Once we get a consistant Krikit baseline from properly adjusted belts then we will have a relatively solid point of adjustment using that gauge.
NancysToy
Motorbike Professor
I'm curios as to whether they used the new spec to adjust Lamont's belt, or the old one for the RT, which was 750 Newtons + or -. That would equate to 160 pounds, so 180 would have been within the old spec.
Firefly
Active member
:agree: This is why I was kicking myself when I forgot to take a reading from Deb or Brian in Cuba. Placement on the belt can also affect those kricket readings. I wouldn't think it could be accurate to more than +- 20lbs. I do like the feeling of the new tension being around 150 lbs.:thumbup:
NancysToy
Motorbike Professor
Was your reading with the Spyder jacked up, or on the ground?
BajaRon
Well-known member
You'd have to talk to Lamont but I believe he got the new spec. I am not sure he knows what Newton setting they used but he is sure his Krikit read 180 lbs.
BajaRon
Well-known member
You are right that placement on the belt will give you different readings but you should get the same reading every time from the same placement and this will be good enough.
Putting the gauge just ahead of the forward passenger peg bracket places it right at the center point in the suspended belt. This should give the most accurate and consistant reading.
I was able to get the same reading every time as I adjusted from 260 lbs to 200 lbs on my Krikit. This gave me confidence that the Krikit can be a reliable tool for measuring belt tension.
Now all we need to know is what reading on the Krikit will give us the correct belt tension. It really doesn't matter if the lbs. increments on the Krikit corrilate exactly with Newtons as long as we know what the Krikit should read to give proper belt tension.
NancysToy
Motorbike Professor
That is my understanding, also.
Firefly
Active member
Jacked up from the frame. You really have to do this because you need to run the bike and adjust the belt alignment-- in forward and reverse. Since the right side was about as loose as it can be, the left will tighten and bring the belt back in towards the flange. I even did some of the adjusting while it was running.
Kricket seemed to be consistent .. but it sure doesn't take much to change it 20-30 lbs.
Too bad those sonic meters are so darned expensive.
Rando
New member
Why don't we pool our money and purchase one to loan out? After the initial purchase, if anyone wanted to use it that paid into the pool they would pay the shipping fee.
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Firefly
Active member
Interesting idea. And rather than shipping it around-- if we kept it to 5 or 6 of us in a certain area (say southern Michigan---
) --- we could just Ryde to pick it up or drop it off.... good excuse for a meet-up.Hmm.....
BajaRon
Well-known member
I suppose in a perfect world that would be fine. But someone would surely break it or it would get lost.
All we really need is a corrilation between a correctly adjusted belt and the Krikit reading. Then we'll all be set.
BajaRon
Well-known member
My impression was just the opposite. It took about 1/2 turn on the adjuster to get a 10 lb. change on the Krikit. I thought it would change faster than that. But a fine theaded adjuster gives you the ability to get a more accurate adjustment.
With the range of 'In Spec.' even with the current narrower range it may not be all that critical.
Firefly
Active member
Yeah-- sure could be a problem-- one innocent drop and BAM-- everyone else is mad at you.
Hey Michigan ryders-- how about a meet-up and belt check sometime in the near future? We know of 2 bikes that are now in the new 450 spec......:thumbup:
Rando
New member
After getting a Krikit and following Ron's instructions, I couldn't agree more. It was EASY!
Come on people, for those of you that have had the service bulletin completed by your dealer, please get a Krikit and post your readings! (bjt, dltang)
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Firefly
Active member
After more ryding this weekend (in the rain- yuk) --- I find the new belt tension to work GREAT. First thing I did was thrash the heck out of it to make sure nothing would slip or cause problems. No issues.
I find the lower (read almost NONE) vibrations of the footpegs to be GREAT.
This has to reduce riding fatigue! :thumbup:
The harmonics are different and I even feel I've changed my shift points a bit-- it just feels different now-- but a GOOD different.
I find the lower (read almost NONE) vibrations of the footpegs to be GREAT.
This has to reduce riding fatigue! :thumbup:
The harmonics are different and I even feel I've changed my shift points a bit-- it just feels different now-- but a GOOD different.
BajaRon
Well-known member
Lamont seems to feel that 180 - 200 lbs. on the Krikit is just about right having measured his harmonically tensioned RT belt at 180 on the Krikit.
I am running mine at 200 lbs. on the Krikit (down from 260 lbs.). At first I did not like it. The vibration was reduced from the previous setting but it spread out over a much wider RPM range. But after having ridden the 1,400 mile from here to Cowtown and back it seems to have smoothed out. Can't say why this is.
I am wondering if my too tight belt (in original BRP spec.) may have stretched unevenly. Not sure if that could have corrected itself somewhat or not.
I need to throw the Krikit on it again and see if the tension has changed.
You should always check the belt after allowing it to cool and with the rear wheel off the ground.
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