SE 120R delivery
Cruiser
Joined: Dec 2007
Posts: 117
Likes: 1
Thanks...
Cruiser
Joined: Jul 2010
Posts: 198
Likes: 0
the cast guides are set up loose from the factory. this is there attempt at correcting the problems they had with valves sticking in the guides on these heads and the 110 heads. IMO it was more a tuning issue,they were so lean that the heat caused the valve to stick. we know they cant pass emissions unless they are lean. so they had to do something. I dont think the cast guides will be that big of an issue if they are tuned early on.
the other reason behind the bronze guides was in the process of getting the heads flowing better and to correct the geometry there is going to be a new valve job,so why not correct it from the start,was the thought.
the other reason behind the bronze guides was in the process of getting the heads flowing better and to correct the geometry there is going to be a new valve job,so why not correct it from the start,was the thought.
Cruiser
Joined: Dec 2007
Posts: 117
Likes: 1
What do the standard 96" and 103" engines have for the crank bearings in this area? Is there any difference in this area between the 120r engine and a stock 96" or 103" engine??
Thread Starter
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Road Captain
Joined: Apr 2010
Posts: 709
Likes: 1
From: Maine
Crankshaft bearings
Stock motors don't have the lefty's and the 120R has a SE crankshaft with a different stroke. The new engines have two button head screws that lock the cam chest side crank bearing in the crankcase. That bearing is set to a different depth in the cases than previous twin cams too. The 120R has the new style locked bearing in the case.Why they lock this bearing now i don't know,must have been something they saw happening. This was not a cost cutting step in machining or assembly.
Cruiser
Joined: Feb 2010
Posts: 156
Likes: 0
From: Indiana..hour straight east of Indy
the cast guides are set up loose from the factory. this is there attempt at correcting the problems they had with valves sticking in the guides on these heads and the 110 heads. IMO it was more a tuning issue,they were so lean that the heat caused the valve to stick. we know they cant pass emissions unless they are lean. so they had to do something. I dont think the cast guides will be that big of an issue if they are tuned early on.
the other reason behind the bronze guides was in the process of getting the heads flowing better and to correct the geometry there is going to be a new valve job,so why not correct it from the start,was the thought.
the other reason behind the bronze guides was in the process of getting the heads flowing better and to correct the geometry there is going to be a new valve job,so why not correct it from the start,was the thought.
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Cruiser
Joined: Jul 2010
Posts: 198
Likes: 0
sure no problem.
those that were wondering about the rod bushings. there are bushings in the rods. and the ends are not tappered. SE rods. got some pic's but they didnt turn out to good.
those that were wondering about the rod bushings. there are bushings in the rods. and the ends are not tappered. SE rods. got some pic's but they didnt turn out to good.
