KZR750R1

Pictures:

Cable retainer....

Bike now...

Talked to Derek at motolab...

Thanks for the yack D.

I will be placing a gage to judge throttle position.

Not many ZR motors out there with a kerker pipe and BS34 mm carbs.

Well see when I can get it down for a dyno run to start a new baseline for my basket of parts.

Bumped the Needles up one notch. For some reason there was a spacer under the #1 needle only?

All are set at #3 notch, no space included in #1. Power picked up.

Took a long ride this morning and pulled th plugs for a look at color...

Seems a bit light to me. What do you guys think?

Picture....

Yeah, they do seem light...but fractionally so.

Hoping for a little adjustment on the primary and see how that helps low end.

Have to do the ol screw turn monkey business. Probably an 8th or 16th off, possibly less?

Adjusting the needle up one click sure gained top end and drivability through 5 and 6K.

Control is great with these on board. RS always was on the knife edge... Could reach the rev limiter in a hurry with those though. Haven't found the ceiling yet with these... Motor will be thankful for that.

Most driving seems to be around 3/8 throttle.

Passing going to 3/4 and it moves well. Can bog it down in 5th and pull out from bottom end much turmoil.
Kinda nice.

Moving through additional adjustments. Increased the Mains to 142.5. Was a big improvement in top end. Still seem to have a burble in transition from pilot to needle circuit.

Since I can't afford dyno time it's probably going to get some larger primary jets and see how it performs.

I screwed myself initially with more than one change and had to place the needle back to four. Three didn't cut it and four had the best midrange mix so far.

Interesting thing is the needle adjustment moves the burble up 1K RPM each clip change.

This is why I'm thinking of opening up the Pilot.

kzr750r1 wrote:

Still seem to have a burble in transition from pilot to needle circuit.

What throttle position does this happen at?

Since I can't afford dyno time it's probably going to get some larger primary jets and see how it performs.

Are you referring to pilot jets?

Interesting thing is the needle adjustment moves the burble up 1K RPM each clip change.

This is when raising the needle?

This is why I'm thinking of opening up the Pilot.

Can you explain further?

Regards,

Derek

If it seems to hesitate and you want to see if its too lean, consider using the choke to see if it helps.

Pilots are what I'm referring to. Probably around 1/3 to half is where the hesitation (burble) is happening at 6K.

Unfortunately I'm not trusting this tack any longer. When things get busy it swings wild in the hi range after 7K when on the pipe... :)More motion on the tack than on the road.

As for testing with the enrichments opened may give some indication but I'm looking for that nice sweet spot. This would just dump more fuel than the next size Pilot Jet would be doing for me.

It may just be as close as I'm going to get with the financial compromise I have to make at the moment. Wait for payday and will be at Derek's doorstep.

I'll get some more runs in later this weekend and get a better handle on the throttle position.