Z1R BUILD

If in doubt, or it doesn't seem to fit elsewhere - put it here.

Re: Z1R BUILD

Postby John H » Sun May 05, 2024 9:48 pm

Finally got some painting done. The crankcase on the engine stand worked great. I was able to stand in one place and paint while rotating the cases with the crank. I used Spraymax 2K which worked pretty good.
paint crankcase1.JPG
paint crankcase1.JPG (251.42 KiB) Viewed 3830 times
Paint crankcase2.JPG
Paint crankcase2.JPG (252.83 KiB) Viewed 3830 times
[i][color=#4040BF]John[/color][/i]
John H
 
Posts: 1078
Images: 8
Joined: Wed Jun 13, 2012 10:19 am
Location: Northwest

Re: Z1R BUILD

Postby John H » Sun May 12, 2024 4:24 pm

Paint's dry so assembly starts with the crank and gearbox parts. Of course all the threaded holes have been chased and cleaned.
assemble eng.JPG
assemble eng.JPG (321.5 KiB) Viewed 3799 times

Once everything checks out the bottom engine case is ready to bolt up.
assemble eng2.JPG
assemble eng2.JPG (326.11 KiB) Viewed 3799 times

Many of the early Z's and KZ's fitted the dyno rotor without a keyway which was a mistake as the back side of the rotor includes the starter clutch. Consequently they would start slipping on the crankshaft taper and gall badly. Usually lapping with some abrasive paste solves the problem. The final fitting indicated the rotor is now .015" farther onto the crank and binding against the starter gear. So next step is to remove. 015" from the gear.
starter gear narrow.JPG
starter gear narrow.JPG (165.67 KiB) Viewed 3799 times
[i][color=#4040BF]John[/color][/i]
John H
 
Posts: 1078
Images: 8
Joined: Wed Jun 13, 2012 10:19 am
Location: Northwest

Re: Z1R BUILD

Postby Lotus54 » Sun May 12, 2024 5:51 pm

Interesting main bearing setup.
1976 OSSA Super Pioneer- 78 Benelli 750 sei,72 250 2C Benelli, 68 Benelli Dynamo trail, 76 OSSA GPII Phantom, Beta XTrainer 300, Lotus Elan S3
User avatar
Lotus54
 
Posts: 596
Images: 0
Joined: Tue Jun 12, 2012 9:13 pm

Re: Z1R BUILD

Postby John H » Sun May 19, 2024 3:09 pm

Piston rings should arrive this week. The rotor was rubbing when I tried installing the dyno cover. Placing an indicator on the rotor showed a wobble of .005". I thought it could possibly be the taper bore of the rotor since it was pretty galled up before I lapped it in. Rotating it to different positions changed nothing indicating it was the crankshaft.
Crank wobble.JPG
Crank wobble.JPG (331.66 KiB) Viewed 3510 times

Years ago when I use to weld these Kawasaki crank pins so they wouldn't shift. Part of the process was dialing in the end of the crank and if necessary I would true them before welding. I made a crude spreader similar to the one I use to have. It worked well and now the crank and rotor run perfectly true.
crank truing wedge.JPG
crank truing wedge.JPG (278.9 KiB) Viewed 3510 times
[i][color=#4040BF]John[/color][/i]
John H
 
Posts: 1078
Images: 8
Joined: Wed Jun 13, 2012 10:19 am
Location: Northwest

Re: Z1R BUILD

Postby John H » Sat May 25, 2024 11:23 am

Finally got the motor buttoned up and in the frame. The "C" jig worked perfect. First time I've installed on of these without sweating. It takes only one small tilt and twist then drops right in. Next phase is rebuilding the carbs.
Motor install.jpg
Motor install.jpg (286.21 KiB) Viewed 3270 times
[i][color=#4040BF]John[/color][/i]
John H
 
Posts: 1078
Images: 8
Joined: Wed Jun 13, 2012 10:19 am
Location: Northwest

Re: Z1R BUILD

Postby John H » Fri May 31, 2024 4:55 pm

Carbs are in fairly good condition and after cleaning and vapor blasting they were disassembled. Jetting if a bit off for this motor and year so have to make a decision whether to test if first or go with manual's settings. Float needles show slight wear and probably ok as is but with a slight modification I can exchange them for a viton needle/seat combo that will work.
It's rather time consuming setting float levels when all 4 carbs are racked up on their frame so I mickie'd up a stand so I could do one at a time, at eye level. With my fuel level attachment I can fill, check, drain and adjust and refill much easier this way.
Zir carbs.JPG
Zir carbs.JPG (320.05 KiB) Viewed 3023 times
Carb float set.jpg
Carb float set.jpg (399.75 KiB) Viewed 3023 times

Carb float jig.JPG
Carb float jig.JPG (210.62 KiB) Viewed 3023 times
[i][color=#4040BF]John[/color][/i]
John H
 
Posts: 1078
Images: 8
Joined: Wed Jun 13, 2012 10:19 am
Location: Northwest

Re: Z1R BUILD

Postby Lotus54 » Mon Jun 03, 2024 3:02 pm

Neat jig to install engine. I tipped the engine on end, and lowered the frame over the engine with my sei. But I like the way you did it.
Great idea with the carbs.
1976 OSSA Super Pioneer- 78 Benelli 750 sei,72 250 2C Benelli, 68 Benelli Dynamo trail, 76 OSSA GPII Phantom, Beta XTrainer 300, Lotus Elan S3
User avatar
Lotus54
 
Posts: 596
Images: 0
Joined: Tue Jun 12, 2012 9:13 pm

Re: Z1R BUILD

Postby John H » Tue Jun 18, 2024 9:25 pm

Most of us who work alone come up with tools that make life easier. The lift finally got modified to also put the motor in without straining a muscle. Should have done it a long time ago.
The final stage of the carbs was syncing the throttle slides. The adjustment is inside the top cover. I used an awl to compare how far it would fit under the slide acting like a feeler gauge. I was surprised how much they varied..
sync the slides.jpg
sync the slides.jpg (406.71 KiB) Viewed 2038 times

While waiting for paint to dry on the valve cover I tried installing an extra cover just to verify the location of the larger cd ignition coils. I was surprised when the cover wouldn't clear the frame and cam chain idler. I bolted it to a piece of aluminum then cut the top away and removed enough material to clear the cover then welded it back together. I can now remove the cover without removing the front motor mounts making it easier to adjust the valves.
Cam chain idler.JPG
Cam chain idler.JPG (202.63 KiB) Viewed 2038 times
[i][color=#4040BF]John[/color][/i]
John H
 
Posts: 1078
Images: 8
Joined: Wed Jun 13, 2012 10:19 am
Location: Northwest

Previous

Return to General Discussion

Who is online

Users browsing this forum: No registered users and 7 guests