Yoshimura Camshaft Installation

[Sprinklerhead]

Honestly, I could care less about the bottom end. Rather have a kick ass top end and have to feather my clutch a little around town. I can also usually find places to use WOT around town too.

 

[Harley999]

I need one of the offset adjuster nuts for the slides. I have all four lock screws, but only three slide adjuster nuts. I also need a good 1/4 turn throttle. The throttle I have on it I have to slide my hand forward to get WOT. Also the carbs have really stiff springs, make it a pain in the ass to open fast. With the 1/4 turn throttle I'm also going to need a slim kill switch/starter switch to replace the stock one. Not enough room on the bar otherwise.

Oh, and the carbs are Mikuni RS38's.

might be a good idea to decrease spring pressure in your throttle as well, with going from 1/2 to 1/4 turn in your throttle, its going to be twice as much pressure on your wrist to hold the throttle open, bad thing about decreasing the spring pressure though would be your throttle would not snap back as quickly..

 

[Sprinklerhead]

Not sure what you mean, but there is not spring in the throttle if that's what you're talking about. It's a push pull throttle. I don't mind having to hold the throttle tighter, it's how far I have to turn it to get WOT that is the biggest problem right now.

 

[ALANRIDER7]

Here we go...............

First thing is to strip the bike down. Remove the tank, seat, tail section, side fairings, etc with help from your assistant...............

 

[ALANRIDER7]

Removing the airbox gives you access to the throttle bodies.

 

[ALANRIDER7]

Line the timing mark up for TDC#1 for cam removal.

 

[ALANRIDER7]

I cover the throttle bodies to prevent any foreign object entry. Then I remove the fresh air system and the valve cover.

 

[ALANRIDER7]

With the valve cover removed, I then have access to the cam caps.

 

[ALANRIDER7]

The cam chain tensioner is removed next.

 

[ALANRIDER7]

With the cam caps off, you have to finesse the cams out one at a time VERY carefully.

 

[ALANRIDER7]

Make sure you secure the cam chain so it stays up without dropping down into the motor. With the cams out, I now have access to the valves. The bearing surfaces and bucket tops are inspected for excess wear, gouges, etc.

 

[ALANRIDER7]

My quality control technician has inspected the Yoshimura Stage 1 cams. These are good for 21 horsepower on the 1000. Serious quality. The fit and finish are beautiful. The slotted sprockets have to be timed accordingly for the application to get the right lobe center.

 

[ALANRIDER7]

The valve shims are all measured and inspected.

 

[ALANRIDER7]

I put each bucket back in it's original position with Royal Purple synthetic assembly lube. (critical)

 

[ALANRIDER7]

It's important to make sure it gets into all the nooks and crannies.

 

[awgeezdawn]

so that's what a quality control technician does

 

[ALANRIDER7]

The new cams are coated with assembly lube and put into position one at a time. The exhaust cam is first. The cam chain position is critical.

 

[ALANRIDER7]

The intake cam goes in and then the caps are put on slowly. You are compressing some of the valves so it's critical to tighten the caps evenly.

 

[ALANRIDER7]

I use a SnapOn digital torque wrench to make sure everything is tightened properly.

 

[ALANRIDER7]

The tightening sequence is very important. Before doing this step, I double check the cam timing.