96 heritage engine issue
Thread Starter
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Intermediate
Joined: Sep 2022
Posts: 31
Likes: 9
From: Washington
Yes i have and vibration was still present. I have also pushed the bike to a high speed on a straight away and pulled the clutch and coasted and as the engine speed dropped the vibration was gone will still coasting at 60 and the engine at an idle.
Thread Starter
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Intermediate
Joined: Sep 2022
Posts: 31
Likes: 9
From: Washington
The kit i used did not require the case to be bored but it did raise the compression. the kit used was by v-twin 11-1258. Part of the reason i did not go bigger i coulding find a machine shop local to me that had the proper tools to bore it so i went with compression increase and minimal displacement change it only increased from 80 to 83. So i could go back to stock if i wanted. runing it with an ev-27 cam
That being said the bike feels great minus the vibration so unless i really have to i would rather solve the problem then go backwards.
The kit is built with wiseco pistons so they are not some cheap garbage. i am trying to find the weight of them at the moment because with the stock weigh given above that might help figure out what is going on.
That being said the bike feels great minus the vibration so unless i really have to i would rather solve the problem then go backwards.
The kit is built with wiseco pistons so they are not some cheap garbage. i am trying to find the weight of them at the moment because with the stock weigh given above that might help figure out what is going on.
Last edited by Tallguy64; May 24, 2025 at 12:40 PM.
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,830
Likes: 7,968
From: poway
The kit i used did not require the case to be bored but it did raise the compression. the kit used was by v-twin 11-1258. Part of the reason i did not go bigger i coulding find a machine shop local to me that had the proper tools to bore it so i went with compression it only increased from 80 to 83. So i could go back to stock if i wanted. runing it with an ev-27 cam
That being said the bike feels great minus the vibration so unless i really have to i would rather solve the problem then go backwards.
The kit is built with wiseco pistons so they are not some cheap garbage. i am trying to find the weight of them at the moment because with the stock weigh given above that might help figure out what is going on.
That being said the bike feels great minus the vibration so unless i really have to i would rather solve the problem then go backwards.
The kit is built with wiseco pistons so they are not some cheap garbage. i am trying to find the weight of them at the moment because with the stock weigh given above that might help figure out what is going on.
Thread Starter
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Intermediate
Joined: Sep 2022
Posts: 31
Likes: 9
From: Washington
Yes the bike is timed. Valves checked and re checked. Carb adjusted and jets replaced a few times. Honestly the bike runs great, idles great and sounds great. Just 3k and above it starts to vibrate and when i say vibrate i mean it is to the point if you are on it your eyeballs can not focus because the force is so strong. the vibration will occur at any speed and any gear so i believe it is truly in the engine and not anything else. Oh and the spark plugs look great and only get a little smoke after a long decel and a hard accel right after which from my experience is the excess oil from still breaking in.
I have looked all over this morning and can not find the weight for these pistons i sent wisceo and email but that wont get answered until Tuesday at the earliest at this point if some one is familiar with them or had a set laying around for a weight that would be great i believe the part number is 4724P4 for the piston used in this kit. Unfortunately i wont probably have time to tear mine down until next weekend.
I have looked all over this morning and can not find the weight for these pistons i sent wisceo and email but that wont get answered until Tuesday at the earliest at this point if some one is familiar with them or had a set laying around for a weight that would be great i believe the part number is 4724P4 for the piston used in this kit. Unfortunately i wont probably have time to tear mine down until next weekend.
Seasoned HDF Member
Joined: Aug 2006
Posts: 24,428
Likes: 30,648
From: Pennsylvania
Hey all,
I did not do any balancing or weighing of the internal parts. After replacing the connecting rod bearings I did true the flywheel assembly on my lathe with dial indicators and i spent way too much time getting it almost dead nuts. I am in the process of stripping the bike back down to pull the engine but i had a thought after doing some research and looking for some advice.
I did not do any balancing or weighing of the internal parts. After replacing the connecting rod bearings I did true the flywheel assembly on my lathe with dial indicators and i spent way too much time getting it almost dead nuts. I am in the process of stripping the bike back down to pull the engine but i had a thought after doing some research and looking for some advice.
Thread Starter
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Intermediate
Joined: Sep 2022
Posts: 31
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From: Washington
No metal was removed from the flywheel the only major change in the rotational mass is the pistons and possible the wrist pins. I am wondering if the 10:1 pistons because of the dome are heavier then stock this would explain why this vibration is occurring. From what i can find if they are lighter then the original ones in theory it will still vibrate but should make the vibration occur at a higher rpm when looking at balance percentage, but to be honest i am still trying to fully understand balance percentage, a lot of Sciencey stuff lol.
Last edited by Tallguy64; May 24, 2025 at 12:53 PM.
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,830
Likes: 7,968
From: poway
Yes the bike is timed. Valves checked and re checked. Carb adjusted and jets replaced a few times. Honestly the bike runs great, idles great and sounds great. Just 3k and above it starts to vibrate and when i say vibrate i mean it is to the point if you are on it your eyeballs can not focus because the force is so strong. the vibration will occur at any speed and any gear so i believe it is truly in the engine and not anything else. Oh and the spark plugs look great and only get a little smoke after a long decel and a hard accel right after which from my experience is the excess oil from still breaking in.
I have looked all over this morning and can not find the weight for these pistons i sent wisceo and email but that wont get answered until Tuesday at the earliest at this point if some one is familiar with them or had a set laying around for a weight that would be great i believe the part number is 4724P4 for the piston used in this kit. Unfortunately i wont probably have time to tear mine down until next weekend.
I have looked all over this morning and can not find the weight for these pistons i sent wisceo and email but that wont get answered until Tuesday at the earliest at this point if some one is familiar with them or had a set laying around for a weight that would be great i believe the part number is 4724P4 for the piston used in this kit. Unfortunately i wont probably have time to tear mine down until next weekend.
HDF Community Team
Joined: Dec 2005
Posts: 5,376
Likes: 2,574
From: NC USA
The kit i used did not require the case to be bored but it did raise the compression. the kit used was by v-twin 11-1258. Part of the reason i did not go bigger i coulding find a machine shop local to me that had the proper tools to bore it so i went with compression increase and minimal displacement change it only increased from 80 to 83. So i could go back to stock if i wanted. runing it with an ev-27 cam
That being said the bike feels great minus the vibration so unless i really have to i would rather solve the problem then go backwards.
The kit is built with wiseco pistons so they are not some cheap garbage. i am trying to find the weight of them at the moment because with the stock weigh given above that might help figure out what is going on.
That being said the bike feels great minus the vibration so unless i really have to i would rather solve the problem then go backwards.
The kit is built with wiseco pistons so they are not some cheap garbage. i am trying to find the weight of them at the moment because with the stock weigh given above that might help figure out what is going on.
So here is the bad news. You're very limited because that piston/kit has you at +040 bore which has the cylinders super thin.
The stock or Wiseco wrist pin is 85 (+-) grams so the magic number your looking for is 476 grams both or 392(+-) grams for piston only. Seems Wiseco can get you a heavier pin if needed once you get the weight of the piston. You might be able to get some from CR. They have all sizes in between, heavier pins and all but they are really expensive.
The balance factor was found, literally by the Indian engineers. They did trial and error until they found the magic number of 60% percent. And if anyone tries to convince you otherwise than that number for the street, ignore them forever.
Last edited by t150vej; May 24, 2025 at 01:08 PM.
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Stellar HDF Member
Joined: Aug 2011
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From: Newnan, GA
The best advice!
Thread Starter
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Intermediate
Joined: Sep 2022
Posts: 31
Likes: 9
From: Washington
I had a feeling that's what you had since you didn't mention case boring initially. And kudos for doing your flywheel. So many "performance" shops won't touch one, go figure...
So here is the bad news. You're very limited because that piston/kit has you at +040 bore which has the cylinders super thin.
The stock or Wiseco wrist pin is 85 (+-) grams so the magic number your looking for is 476 grams both or 392(+-) grams for piston only. Seems Wiseco can get you a heavier pin if needed once you get the weight of the piston. You might be able to get some from CR. They have all sizes in between, heavier pins and all but they are really expensive.
The balance factor was found, literally by the Indian engineers. They did trial and error until they found the magic number of 60% percent. And if anyone tries to convince you otherwise than that number for the street, ignore them forever.
So here is the bad news. You're very limited because that piston/kit has you at +040 bore which has the cylinders super thin.
The stock or Wiseco wrist pin is 85 (+-) grams so the magic number your looking for is 476 grams both or 392(+-) grams for piston only. Seems Wiseco can get you a heavier pin if needed once you get the weight of the piston. You might be able to get some from CR. They have all sizes in between, heavier pins and all but they are really expensive.
The balance factor was found, literally by the Indian engineers. They did trial and error until they found the magic number of 60% percent. And if anyone tries to convince you otherwise than that number for the street, ignore them forever.
