Another tensioner post.
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Assume the dealer is installing the "hybrid" kit since you are retaining stock cams. A nice package with billet cam plate, hydraulic tensioners, outer chain is roller but inner chain is old Morse "silent" chain but still a good package.
Save yourself some $$ and install yourself. Pull it down and take the assembled cam plate to the dealer and have them R/R the cams and bearings and return you the assembled cam plate. Most of the labor you are paying for is R/R exhaust, etc.;
Take advantage of this opportunity and upgrage the inner cam bearings to the B148s and install new o-ring at oil pump/crankcase scavenge port.
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The banter that the parasitic power drain of the chain drives is greater than the parasitic power drain of gear drives has never been proven. Both require HP to drive them and I would bet a six pack that the parasitic power drain is near the same. Furthermore, if there is a difference, it won't win/lose a race or register on the "butt dyno".
Anyone that thinks just because an engine is an early model with a forged crank makes one immune from the wheels slipping just isn't thinking; it happens. When it does, with gear drives; bad juju!
The reasons I prefer the hydrualic cam drive to gears are:
1. much easier to work on: no cam gears to press on/off, no lash setting of inner gears, no cam bearings to press on/of (unless you have the hybird conversion)
2. new tensioner shoe material like the primary chain tensioner material that will last a long time.
3. the added benefit of the improved oil pump that provides better flow and, more importantly, better scavenging. IMHO, the oil pump alone is worth making the change over to the hydraulic setup.
4. If you decide to change cams, you can do it much faster and you don't need a hydraulic press to make the change.
5. the new hydraulic setup has been out for four years now and has help up. The only problems I am familier with are the results of DIY installers that did not install the cup/spring in the correct order. Even then there was no failure, just premature wear.
I will also tell you that I have an '05 with a cast crank and I installed gears when I converted to 95" but gears was the only alternative at the time. That crank had .0025" TIR and I spent hours getting the inner/outer gear lash set to spec and had to order an under size pinion gear to get it setup right. I did get it set up right and the gears are quieter than the stock chains were. However, my next upgrade on that bike will be a fresh top end, different heads and cams and I will convert the gear drives to the hydraulic setup for all the reasons cited above.
There are no absolutes, either drive system will work. The decision is an individual choice but I don't think guys should just blindly jump on the gear band wagon because joe six pack says gear drives are the "only way" to address the issue; there is an alternative. JMHO.
Last edited by djl; Jan 19, 2011 at 03:30 PM.







