Track Day Winner
Join Date: Mar 2016
Location: Kingsville, on
Motorcycle: 86 Yamaha Venture, 84 Suzuki GS1150EF x 2, 93 GSXR 750
93 750 cams
Hi guys, I've been looking around at this and another forum regarding an issue I've got when installing the cams. Last summer I squeezed a head gasket out and was trying to get it repaired so I could get some riding in before I went in for back surgery and things didn't quite work out as I hoped.
We did get the engine back together, bench sync'd the carbs and ran it on the hoist to balance the carbs with the syncro gauges sucking fuel out of a lucas bottle. With the fairing off she was running perfect, crisp throttle response, sounded hungry etc. Put the tank and bodywork on and she'd run like crap and was only banging on 3 cylinders. Took the tank and bodywork back off, ran great. Went through this gong show a couple times and was gonna go around the block to clear her throat when I noticed coolant leaking where it shouldn't have been.
When we were tearing the engine down, we found some bright and shinny's in the bottom of the pan, so over the winter during my recovery I tore everything down to a bare frame and started over. While going through everything, I remembered I didn't like how the cams had dropped in the last time, and upon further investigation, the cam journals seems to be where the surprise was in the oil pan originated.
Couple questions, when lining the cams up properly before tightening the caps, the lobes on #2 exh and #3 int both point almost straight down making it, interesting trying to install them and ending up with the marks lined up properly. You don't want to know how many times of in and out it took me to get them installed properly the first time. As the caps are tightened, they want to roll back not forward to drop into the journals as I assume they should. Is this normal? As I haven't seen anyone mention this yet, is there something I'm doing incorrectly? I've looked at how the gears and lines are clocked in relation to the lobes and it all looks good. I thought maybe the previous owner had different cams or something.
As the chassis is almost done, and the engine is next on the list to go together, I would like to avoid the problems I had last year.
No the cam journals don't look too bad, I don't think I put 5k on it last year. I took the head and jugs into the machine shop and they took 3 tho off the head, and checked it all out for warpage, cracks etc. All good.
I know this is a little long winded, but I figured the more information I wrote, the easier it would be for someone to zero in on what the problem might be.
Are the lobes pointing down forcing the valves to open while installing the cams normal? What's the trick?
Anyone else had the symptoms I was facing while balancing the carbs? Any ideas on why she didn't want to go out in public fully dressed?
Anyone have an ignition pickup from the dyna 2000 ignition kit they can take a pic of and maybe a couple measurements ? I'd like to make a plate to mount the pickup's on so I can run the 1150 stuff, instead of spending $160 . I've decided to try the dyna on the 750 for a bit as the 1150 is getting pushed into a corner for a little while.
Any and all help is appreciated, thanks.
I just do what the voices tell me.
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