Piston Weights
Grand HDF Member
Joined: Sep 2017
Posts: 4,359
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From: Dubuque, IA
I noticed that too. Be better to weigh them all on the same scale but I doubt any of them are that far off. I borrowed my neighbor's digital with a max of 2lbs. I'm sure it's awful damn close to dead on.
HDF Community Team
Joined: Jun 2006
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From: san antonio
[QUOTE=60Gunner;20553333]I noticed that too. Be better to weigh them all on the same scale but I doubt any of them are that far off. I borrowed my neighbor's digital with a max of 2lbs. I'm sure it's awful damn close to dead on.[/QUO
I suspect the difference is in the skirt; full skirt on the TC88/95 piston but not on the 103 piston.
Where's Max when we need him.
I suspect the difference is in the skirt; full skirt on the TC88/95 piston but not on the 103 piston.
Where's Max when we need him.
Grand HDF Member
Joined: Sep 2017
Posts: 4,359
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From: Dubuque, IA
[QUOTE=djl;20553338]
And/or lighter wrist pin weight? Wrist pins are 128g.
What are the wisecos? CP 3cc? Anyone know off hand?
I thought most newer pistons are all suppose to be close enough just for this reason. Not everyone does cranks. Manufacturers can make up differences with the weight of the wrist pins, etc. Maybe not all of them do?
I noticed that too. Be better to weigh them all on the same scale but I doubt any of them are that far off. I borrowed my neighbor's digital with a max of 2lbs. I'm sure it's awful damn close to dead on.[/QUO
I suspect the difference is in the skirt; full skirt on the TC88/95 piston but not on the 103 piston. Where's Max when we need him.
I suspect the difference is in the skirt; full skirt on the TC88/95 piston but not on the 103 piston.
Where's Max when we need him.What are the wisecos? CP 3cc? Anyone know off hand?
I thought most newer pistons are all suppose to be close enough just for this reason. Not everyone does cranks. Manufacturers can make up differences with the weight of the wrist pins, etc. Maybe not all of them do?
Last edited by 60Gunner; Apr 11, 2022 at 06:56 PM.
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Road Captain
Joined: Sep 2012
Posts: 625
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From: Mo
Thanks for weighing them. Now I just need to find out what the Wiseco weighs. If I have to I might pull the front cylinder over the weekend. I will probably pull the cam chest apart and double check the runout. Crank could have shifted but it would have had to do it on the first ride and I didn't even turn it past 3000 rpm. But if I have to pull it apart I'm going to check everything.
Grand HDF Member
Joined: Sep 2017
Posts: 4,359
Likes: 1,219
From: Dubuque, IA
Thanks for weighing them. Now I just need to find out what the Wiseco weighs. If I have to I might pull the front cylinder over the weekend. I will probably pull the cam chest apart and double check the runout. Crank could have shifted but it would have had to do it on the first ride and I didn't even turn it past 3000 rpm. But if I have to pull it apart I'm going to check everything.
Have you checked the motor mounts? What did you all do in this build drivetrain related?
Last edited by 60Gunner; Apr 11, 2022 at 09:02 PM.
Road Warrior
Joined: Sep 2021
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From: So fla
definitely need to figure out the vibration. It's not a shovel
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Road Captain
Joined: Sep 2012
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From: Mo
If you refer back to my first post, I went over everything. It is not motor mounts, exhaust or anything else hitting the frame. This issue was there first test ride on new 107 build it is in the engine. Everything in the drive train is as it was last year except the new compensator that I just put in to see if it would fix the vibration. It either has to be a balance issue or the crank shifted which I find quite unlikely since I checked it when it was apart and it checked .0015. I did not turn it past 3000 RPM on the first ride. Could the crank slip, sure anything is possible but seems unlikely. I will however check run out this weekend as it looks like I will be tearing back into it.
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Joined: Dec 2005
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From: poway
If you look at the SnS catalog for pistons weights under the crank section they balance to 1230g (both pistons) for early TCs and 1035 for 06 dyna and 07 up .
IIRC I got 596 with early stock and something like 520 with late. I can measure and late 103 and get back.
My question to OP would be does the bike vibrate at a particular RPM or does it get worse as the Rs go up?
Was anything else done at the tome of the upgrade? Primary? Exhaust? Intake? Has the bike been tuned?
IIRC I got 596 with early stock and something like 520 with late. I can measure and late 103 and get back.
My question to OP would be does the bike vibrate at a particular RPM or does it get worse as the Rs go up?
Was anything else done at the tome of the upgrade? Primary? Exhaust? Intake? Has the bike been tuned?
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Grand HDF Member
Joined: Sep 2017
Posts: 4,359
Likes: 1,219
From: Dubuque, IA
If you refer back to my first post, I went over everything. It is not motor mounts, exhaust or anything else hitting the frame. This issue was there first test ride on new 107 build it is in the engine. Everything in the drive train is as it was last year except the new compensator that I just put in to see if it would fix the vibration. It either has to be a balance issue or the crank shifted which I find quite unlikely since I checked it when it was apart and it checked .0015. I did not turn it past 3000 RPM on the first ride. Could the crank slip, sure anything is possible but seems unlikely. I will however check run out this weekend as it looks like I will be tearing back into it.