| Author | Message | ||
     1_mike |
I'm adjusting the valves in my CR right now (taking a lunch break!!). I bought the Hot Cams, shim kit to do it with as I know that "all" of my shims require changing. One thing I noticed...that (rear cylinder is complete), that all of the shims have a rough ground surface on them. Rough meaning somewhere slightly rougher thAn 250 RMS... They really need to be smooth. I polished them on a piece of 3000 grit sand paper and they seemed to polish fairly quickly, which scares me a little as far as their wear capibilities. Hope they don't wear out like....stators go south...! And leave all that metal floating around in the oil pan. Mike | ||
| Jcjohnson33 |
I just got the kit too but have not used it as of yet | ||
| Xtreme6669 |
I have used their kits on my MX bikes with no issues. No feed back on the 1125 thou | ||
| 1_mike |
Not sure how some other designs work... But with the Buell, the shim is a "wear" item. It's not protected from wear by a bucket as in many engine designs. It spins with the valve and is rubbed on by the rocker. With the machine marks on the shims (Hot Cams), this may cause undue wear on the rocker pad. Not positive. That's why I tried the polishing with the sand paper (actually plastic sheet, 3000 grit!). And...because it polished so easilly...that made me question the hardness of the shims, and the use in the Buell/Rotax engine. I did e-mail Hot Cams...they didn't know the hardness, but did say that they are made of 4140...heat treat unknown. Mike | ||
| Musclecargod |
Machine marks on a supposedly heat treated component is a bad sign, it should have been ground after heat treatment. Also no information on heat treatment is a huge red flag (they probably use pre-hard but should still have heat treat/temper data). 4140 should be at around 28-36 HRC. I make precision ground heat treated components on a regular basis, I would stay away from from anything with the issues you describe. | ||
| Oldog |
I did e-mail Hot Cams...they didn't know the hardness, I would not put those in my engine } | ||
| 1_mike |
Agreed. While sitting on the toilet at 4:30 this morning, I decided not to use them. I will be removing them and going back to OEM shims. But I've got other problems I found. Intake cam, front cylinder, one valve...pitted cam nose.... No discoloration, no scratches...just pits..! *&^*(%^&*$^&#%^@# Mike | ||
| Avc8130 |
Mike, That seems to be somewhat common actually. Still under warranty? You MIGHT be able to get the dealer to get you a new cam. ac | ||
| Musclecargod |
Does anybody know what the cams are made of? I assume ductile iron or something similar. If pitting is an issue perhaps they could be ion-nitrided. | ||
| Zac4mac |
I had pitting on the front exhaust cam at the 12k service. Warranty replaced cam and follower. Did the 25k service last year and the new cam and follower looked good, as did all the others. Swapped out 6 of 8 shims using V-Rod/Buell shims. I think they had some heat-treating issues early on. Loretta is #154, built in the first or 2nd week of production in 2007. I got her a week before Christmas 2007. Z |
