Degreeing cams on GS700

[lecroy]

I forgot to bring this up (how do you make the measurement because there are a few ways) but I agree, using 0.050 is good. Make sure its always turning the same direction (that it runs in) otherwise you would have the hysteresis to deal with. If you go to far, back it enough to reset the chain then try again. Just basic stuff but all of it adds errors and with you getting into 0.01 degree readings, that's pretty tight.

I have no idea what you bike would have been shipped with but yes, I would buy those numbers.

I don't understand why anyone would attempt to degree cams but be reluctant to pull the stator cover. It takes all of a couple of minutes, but its your engine.

[oldschoolGS]

I don't understand why anyone would attempt to degree cams but be reluctant to pull the stator cover. It takes all of a couple of minutes, but its your engine.

My reasons:

1. its not really necessary
2. did not want to drain the oil (with bike on rear stand) After installing cams I like to run it first before changing oil to wash out all the moly lube.
3. why disturb the gasket on the stator?

your numbers look good to me. I never indexed stock cams on my '83 750 but did have 2 sets of aftermarket cams set at 110/110. Power was peaky coming on hard at around 7500rpm. I experimented with 104/106 and this did give it more midrange at the expense of top end.

Good Luck, Ed

[Nicholaschase29]

Ok I was doing some thinking.. I just counted the cam gear teeth and there are 34 teeth on each gear. I think I can do this but I'd like you guys to double check my thinking.. If there are two revs per crank per one rev of the cams then if we move the chain one tooth we'll gain what we want. 360/34= 10.588 then devide 10.588 by 2 because per one rev of the crank the cams turn once so it would be 5.29 degrees right? 5.29+105.5 will put us right around ~110 lobe center..

[rapidray]

Ok I was doing some thinking.. I just counted the cam gear teeth and there are 34 teeth on each gear. I think I can do this but I'd like you guys to double check my thinking.. If there are two revs per crank per one rev of the cams then if we move the chain one tooth we'll gain what we want. 360/34= 10.588 then devide 10.588 by 2 because per one rev of the crank the cams turn once so it would be 5.29 degrees right? 5.29+105.5 will put us right around ~110 lobe center..

Do NOT guess! Move it & recheck with the degree wheel. Make SURE you know where it ends up. I wouldn't set the intake any more than 108. I have done enough of this (and dynoed them) to know what works. You need to remember something,this is NOT a DRAGBIKE! You will be spending most of your time riding in the midrange. If your bike has all of the REAL power from 8-10000 RPM you will find yourself re-doing this. I applaud you wanting to do this but think realistically about where the engine will live most of it's run time. Ray.

[Mark M]

Do NOT guess! Move it & recheck with the degree wheel. Make SURE you know where it ends up. I wouldn't set the intake any more than 108. I have done enough of this (and dynoed them) to know what works. You need to remember something,this is NOT a DRAGBIKE! You will be spending most of your time riding in the midrange. If your bike has all of the REAL power from 8-10000 RPM you will find yourself re-doing this. I applaud you wanting to do this but think realistically about where the engine will live most of it's run time. Ray.

I second that. Measure what you HAVE, not what you SHOULD have.

As for not going beyond 108deg, Ray has experience to say it's not a good idea. If you want to try anyway and don't mind going back in if you went to far, then try 110deg and be prepared to redo it back to 108deg if/when you find it is too much. There is nothing like firsthand experience in these matters and trying something just to see is how you get it. If you only want to do it once, listen to Ray.

Mark

[Nicholaschase29]

I think I want to retard my exhaust cam ~7 degrees or so from stock and retard my intake cam ~3-4 degrees. This will increase overlap. This would put my intake center almost exactly where it is now and move the exhaust center up to around 117. These number seem off from what you all have been describing; Am I overlooking something?

[Nicholaschase29]

I adjusted the intake cam this past weekend with my brother. We removed the cam after measuring the cam centers. We were able to determine we needed to remove 1.1mm on the trailing edge of each hole on the cam gear in order to get the centers where I want them. I was actually measuring the exhaust cam incorrectly and it is actually retarded ~3 degrees. I left the center at 107 because I figure it will have a little more of a scavenging effect by pulling the intake charge through the cylinder at the top of the exhaust stroke. I proceeded to set the intake cam at 108 degrees and it ended up being 108.5 when It was all said and done. I actually ended up with a 114 center if i were to move the gear to its full range. By moving it there and turning the engine over i did not experience any interference so I think I should be good. When the engine is hot and the valves stretch a little I may have problems but that's at 114 and I'm at 108.5. I locktighted the cam bolts and torqued everything down and I'm on my way. I put the stock carbs back on the bike (I had gs 34mm carbs on) I'm waiting to do any serious jetting until I get some 34mm gsx-r carbs.....(anyone have any?) Thanks for your help guys. The bike seems to really start to pull at 6500rpms and then again it hits another powerband around 7600 or so it seems but the bike is not jetted right at the moment.

[dschumann]

Do NOT guess! Move it & recheck with the degree wheel. Make SURE you know where it ends up. I wouldn't set the intake any more than 108. I have done enough of this (and dynoed them) to know what works. You need to remember something,this is NOT a DRAGBIKE! You will be spending most of your time riding in the midrange. If your bike has all of the REAL power from 8-10000 RPM you will find yourself re-doing this. I applaud you wanting to do this but think realistically about where the engine will live most of it's run time. Ray.

I thought they all were Ray... What gives???