I want to take my 08 Ultra up to 103". I have been told the tolerance window on Harley jugs is too large. Can I have my 96" jugs bored? Advantages/disadvantages

 

Yes you can have them bored.

 

Yep. Bore 'em.

Advantage -

1. You already own them
2. Boring much cheaper than a new set of 3.875"
3. The shop should be able to custom fit the pistons to the jug
4. A good shop uses torque plates and gives you a perfectly round bore (not that SE jugs are bad, just mass produced)
5. You can actually bore up to a 107" and get maximum displacement

Disadvantage -

1.

 

Im just finishing my 103 kit today and the ring gaps and cylinder specs are dead on,I couldnt be happier besides most shops will charge you 200 + to do your cylinders and harleys are 300. with warranty.

 

No different from having 88" cylinders bored to 95"; same, same. Just make sure that the machine shop has bored motorcyle cylinders before, uses torque plates and know the fitment clearances for the pistons.

Having said that, the random selection of MoCo cylinders and pistons could produce a combination of parts that are out of tolerance but as a general rule, there is no reason to be concerned about using MoCo cylinders and pistons. If you are concerned have the parts measured for fitment before assembly.

 

Yep I agree i measured everything before it went together But i was lucky they were in specs.

 

Wow, you said Harley jugs, I had something totally different in mind. Must be in the wrong section......

 

What do you think Harley does to make their 103's? They just bore them out as well but probably not as well as they should from what I have read. Bottom line, go for it.

 

Bore yours, you won't be sorry.

 

Funny, I saw this thread title and this picture immediately came to mind. I thought I might see it here, great minds think alike.