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[Twolanerider]

" You will also loose some of the compensating cushion with this kit. The gear is just a gear and has no compensating spring system built in. If you have the IDS on the rear pulley you will feel little to no difference in the drive train when snagging a gear."

I have one of those EVO IND. gears and have hesitated to install it cause I have heard claims that (counter) the above quote.......If someone that has it installed and (STILL has it installed) and feels like the vibes have not increased significantly and/or other downsides,  I'd be happy to know about it.

There are several here who lost the compensator when adding a left side crank support kit from a company called GP Designs.  I haven't had the spring loaded compensator on my 107" build for probably 25k miles.  Fortunately no vibration issues. 

Can't say that's been universal though.  A dozen or so of us got these things all about the same time.  At least one (MJZ from the Memphis area) did have a vibration and eventually removed the part and reinstalled the compensator.  For most though it's not been an issue.

[grc]

The main drawback to the EVO sprocket, IMHO, is the fact that you are eliminating a very important device which is critical to the health and well being of a marginal flywheel assembly (crankshaft).  The purpose of the compensator isn't rider comfort, it is protection for the mechanical bits and pieces.  Folks need to understand this before making a decision to eliminate the compensator.  As for the IDS eliminating the need for the compensator, I don't think so.  One other point for those with new bikes; I wouldn't expect H-D to honor the warranty if you have a subsequent crank, primary, or trans failure after your modification.  The EVO folks might try to imply that their part won't cause a problem, but I don't see them stepping up with a definite statement and warranty to protect you.

Just my opinion, but until someone comes out with a smaller sprocket that retains the compensator, the safest approach still involves changing the final drive ratio (trans output sprocket). 

Jerry

[Twolanerider]

The main drawback to the EVO sprocket, IMHO, is the fact that you are eliminating a very important device which is critical to the health and well being of a marginal flywheel assembly (crankshaft).  The purpose of the compensator isn't rider comfort, it is protection for the mechanical bits and pieces.  Folks need to understand this before making a decision to eliminate the compensator.  As for the IDS eliminating the need for the compensator, I don't think so.  One other point for those with new bikes; I wouldn't expect H-D to honor the warranty if you have a subsequent crank, primary, or trans failure after your modification.  The EVO folks might try to imply that their part won't cause a problem, but I don't see them stepping up with a definite statement and warranty to protect you.

Just my opinion, but until someone comes out with a smaller sprocket that retains the compensator, the safest approach still involves changing the final drive ratio (trans output sprocket). 

Jerry

Don't disagree with Jerry at all that there is an intended and important benefit to the compensator being there.  In my case, and that of a few others that lost it when adding the GP Designs bearing support piece, a trade-off was being accepted.

After my engine work hp and tq numbers were such that I was more concerned about the lack of the Timken bearing in the left side than I was about the lack of the compensator.  Considering one issue against the other.  Rather than gut the bottom end and do a Timken conversion decided to try the bearing support and watch closely for any vibration or other negative indicators. 

Fortunately this particular engine has been smooth from day one since its build.  Other's results may vary without the compensator.  In my particular circumstance, however, it was a measured risk I was willing to take.

[Mr. Wizard]

I do not disagree either.....tons of conversations debating the pro's and con's about this everywhere you go. I, for one, aren't smart enough to know the truth (happily admitted) and have only ridden one compensator conversion with the IDS on a 08. I have the front belt conversion on my 07 UC trike without the IDS and can feel no difference between the two respective bikes either just cruising or haul'n arse though the gears. However, HD did make the IDS to help eliminate vibrations and cushion the shift strain.

This is just my point of view but if you are going to make the change to smoke the back tire right off the bike or you are used to banging gears then you should worry about scissoring the crank or blowing the bottom end but just cruising around and enjoying the day or riding with friends there should be no worries. This is what I'm thinking. Maybe one of the builder guys can help us out here?

Only reason I changed mine was to get a heavy trike moving without burning the clutch. I don't do much haul'n arse.   

[moscooter]

 
"However, HD did make the IDS to help eliminate vibrations and cushion the shift strain."
 
I believe the IDS was done by HD to counter the complaints that resulted when they came out with the six speed and/or gear whine that resulted from the (type) of gear used in (5th I believe ).   Of course,  then they have since changed that gear to eliminate the whine that had been there.  So,  now ya have an IDS that causes a (slight) power loss to the rear wheel and with the gear change you don't need it.

[Hoist!]

I won't give up the comp sprocket. That's why the rear pulley makes more sense. There's many things you can do to change gearing on pre-'06 Dyna/all '07 and up BT's. But not on these newer styles. Evo sprocket to replace the comp, trans belt pulleys, trans sprockets, or actual trans gear changes. But the simplest by far is going to the 31T trans belt pulley. I'm keeping the comp sprocket that way, and I'm adding the IDS when I do this too! And no belt or primary chain change required!

Hoist!

[infanterene]

I heard loosing the compensator adds HP. Actually that you loose less HP from the motor to the back wheel. Is this true?

[Hoist!]

I heard loosing the compensator adds HP. Actually that you loose less HP from the motor to the back wheel. Is this true?

I would agree that you lose HP thru the comp. You'd lose HP indirectly to the rear wheel. Directly you're losing it between the motor and the trans, thru the primary. That's fine if you're racing, since you're always breaking chit anyway! But it's not worth losin the protection it provides in normal applications!

Hoist!

[moscooter]

 
Per the service dept at my dealers,  you are also loosing a small percentage of HP due to the IDS setup in the rear hub.