Planet Minis

Beerbatter · 02-06-2006, 06:59 PM

Hey gang,

I've been browsing this forum for a couple months and finally got the nerve to register. I've got a couple of questions and hope you can help me. In return, I hope to answer some questions for others now that I'm registered.

I have a 1973 Z50A (K4) and a 1973 CT70 to match; both bought for me and my sister way back in 73' by my dad. The Z50 has been sitting for 20 years and I just completed the carb and engine work to get the engine back up and running. You won't beleive me but it started up on the very first kick (unreal, Hondas are awesome). I'm working on the chassis now to get the the wheels back to rolling and brakes back to braking

The CT70 hasn't moved in about 30 years, so it will come next. It's officially got 532 miles on the speedo. My sister flipped it on herself when she reved it and slamed into first. The bike landed on her and she never rode it again. I can remember that moment like it was yesterday.

I'll get you guys some pics here soon. These babys, as old as they are, are actually in great condition.

Anyway, on with the current questions/problems.

1). The first is with a leaking petcock. I had to rebuild the petcock clean out the passageways and replace the little rubber gasket inside the petcock. I also replaced the little filter that goes between the petcock and the tank. The leak is around the threads on the tank stem and the petcock nut. Is there supposed to be an oring or gasket between the petcock and the tank? There isn't one there now and as far as I can tell, the flange on the filter is supposed to create the seal, but I may be wrong.

2). The second is the mate between the exhaust pipe and the cylinder. I getting a pretty bad exhaust leak here. The packing that goes into the opening in the cylinder looks good, but I'll probably replace it anyway. However, the split ring spacer that goes between the pipe and the packing has a taper on one side and is flat on the other. Which side goes against the packing, the tapered side on the split ring or the flat side? Also, since the split ring is, well, SPLIT, I can't see how it will seal completely in any case. I suspect that some exhaust leakage is to be expected.

Alright guys, that's enough typing for my first time. I'll get you some pics as soon as I can. In the mean time, thanks for any help you can offer on the above two problems. It's great being on the forum finally.

-Beerbatter...

dirtbkr188 · 02-06-2006, 08:22 PM

There is a gasket between the petcock fitting and the tank threads, as shown below:

The two exhaust collars go between the very tip of the exhaust pipe, which goes into the cylinder first and the flange with the two bolt holes that you slide up in place last. It can be a tough job getting those in place, I usually take a little masking tape, and tape them together, hold them up tight against the pipe end, slide it all up into the cylinder, and then slide the flange up into place.

SprNtrl · 02-07-2006, 05:47 AM

Yea, those exhaust collars a pain in the a$$ to get in there. Takes some patience.

With reagrds to the petcock leak, put the filter first, then slide the rubber collar on the petcock and down, tighten with a 17mm wrench.

Beerbatter · 02-07-2006, 08:10 AM

Dudes,

You guys rock. Thanks for the part number for the petcock seal. I figured there had to be some kind of seal on the petcock. When I took it apart after sitting so long that seal must have just rotted away cause I never saw one. I couldn't find a reference to it anywhere.

And no wonder I was getting an exhaust leak. I was sliding the split spacers in first, followed by the pipe. I never thought of doing it the other way around where the spacers go in after the pipe but in front of the flange. Now it makes alot more sense.

Thanks again guys. This forum rocks.

-Beerbatter...

Beerbatter · 02-07-2006, 08:13 AM

Oh, and one more thing for DirtBkr. Would you care to divulge where your getting that kind exploded parts data? I could really use that source.

-Beerbatter.

daddysmut · 02-07-2006, 08:15 AM

check www.bikebandit.com

and welcome to our home

Beerbatter · 02-07-2006, 08:47 AM

Thanks daddy. Good site but no exploded views for old z50's.

Hey Dirt, can you please double check on that part number. I did a search on it and the hit I got on it referred to the round rubber packing (#5 on your graphics) that goes inside the petcock. Thanks man!

Z · 02-07-2006, 08:57 AM

Why not spend the $10 and get a brand new petcock and never worry about it again? Seriously. Sometimes it's just better to replace certain wear items then beat yourself up over the small stuff. Especially when your garage stinks like gas.

http://www.hondatrailbikes.com/catal...roducts_id=395

Beerbatter · 02-07-2006, 11:22 AM

I here ya Z. I should have went that route in the first place, but I was trying to keep everything as original as possible. The original petcock was in perfect condition after I cleaned it, and I have already purchased the inner rubber disk and the replacement filter, so all that's missing is the little oring.

I can go that route, but I hate to throw away everything I've done so far to preserve the original petcock body.

Next time, I'll consider your advice for other parts, which I'm sure I'll need.

-Beerbatter...

Z · 02-07-2006, 11:24 AM

For the rubber gasket you are wanting, call your local honda dealer and they will be able to look it up on the microfiche and you can order it up..

Beerbatter · 02-07-2006, 11:25 AM

Look what I just found doing some surfing. Well worth the visit if you need a shop manual and exploded parts list.

http://www.hondaheaven.org/Album-ztypes.html

Z · 02-07-2006, 11:29 AM

Quote:

Originally Posted by Beerbatter

Look what I just found doing some surfing. Well worth the visit if you need a shop manual and exploded parts list.

http://www.hondaheaven.org/Album-ztypes.html

Keep in mind a good number of those parts aren't available in the USA, and you have to purchase the parts from Honda of Japan.

FastMC · 02-07-2006, 06:58 PM

Usually when you order those fiter screens that go into the tank they come with the new o-ring.

dirtbkr188 · 02-07-2006, 08:24 PM

Quote:

Originally Posted by Beerbatter

Thanks daddy. Good site but no exploded views for old z50's.

Hey Dirt, can you please double check on that part number. I did a search on it and the hit I got on it referred to the round rubber packing (#5 on your graphics) that goes inside the petcock. Thanks man!

I did double-check, and made the necessary change in the diagram above...

Thanks, Beerbatter

Beerbatter · 02-08-2006, 08:59 AM

Dirt, thanks for the correction on the part number. You da man. I went home after your post and re-assembled the exhaust split ring spacers per your instructions and bingo, everything goes together great now and no exhaust leaks. I don't know why I was so blind to that assembly order cause I like to think of myself as a pretty good mechanic.

Hey Fiddy, I would have expected the o-ring to come with the filter also, but none there.

I haven't forgotten that I promised to post some pics. I've got the pics off the digital cam last night and I have to upload them to server so stay tuned.

02-06-2006, 06:59 PM	#1 (permalink)
Beerbatter PM Newbie Join Date: Feb 2005 Location: Sunny Florida Posts: 24	New to forum and a couple of questions Hey gang, I've been browsing this forum for a couple months and finally got the nerve to register. I've got a couple of questions and hope you can help me. In return, I hope to answer some questions for others now that I'm registered. I have a 1973 Z50A (K4) and a 1973 CT70 to match; both bought for me and my sister way back in 73' by my dad. The Z50 has been sitting for 20 years and I just completed the carb and engine work to get the engine back up and running. You won't beleive me but it started up on the very first kick (unreal, Hondas are awesome). I'm working on the chassis now to get the the wheels back to rolling and brakes back to braking The CT70 hasn't moved in about 30 years, so it will come next. It's officially got 532 miles on the speedo. My sister flipped it on herself when she reved it and slamed into first. The bike landed on her and she never rode it again. I can remember that moment like it was yesterday. I'll get you guys some pics here soon. These babys, as old as they are, are actually in great condition. Anyway, on with the current questions/problems. 1). The first is with a leaking petcock. I had to rebuild the petcock clean out the passageways and replace the little rubber gasket inside the petcock. I also replaced the little filter that goes between the petcock and the tank. The leak is around the threads on the tank stem and the petcock nut. Is there supposed to be an oring or gasket between the petcock and the tank? There isn't one there now and as far as I can tell, the flange on the filter is supposed to create the seal, but I may be wrong. 2). The second is the mate between the exhaust pipe and the cylinder. I getting a pretty bad exhaust leak here. The packing that goes into the opening in the cylinder looks good, but I'll probably replace it anyway. However, the split ring spacer that goes between the pipe and the packing has a taper on one side and is flat on the other. Which side goes against the packing, the tapered side on the split ring or the flat side? Also, since the split ring is, well, SPLIT, I can't see how it will seal completely in any case. I suspect that some exhaust leakage is to be expected. Alright guys, that's enough typing for my first time. I'll get you some pics as soon as I can. In the mean time, thanks for any help you can offer on the above two problems. It's great being on the forum finally. -Beerbatter...

02-06-2006, 08:22 PM	#2 (permalink)
dirtbkr188 3rd Gear Member Join Date: May 2004 Location: New Jersey Posts: 2,972	There is a gasket between the petcock fitting and the tank threads, as shown below: The two exhaust collars go between the very tip of the exhaust pipe, which goes into the cylinder first and the flange with the two bolt holes that you slide up in place last. It can be a tough job getting those in place, I usually take a little masking tape, and tape them together, hold them up tight against the pipe end, slide it all up into the cylinder, and then slide the flange up into place. Last edited by dirtbkr188; 02-07-2006 at 08:21 PM.

02-07-2006, 08:10 AM	#4 (permalink)
Beerbatter PM Newbie Join Date: Feb 2005 Location: Sunny Florida Posts: 24	Thanks a million Dudes, You guys rock. Thanks for the part number for the petcock seal. I figured there had to be some kind of seal on the petcock. When I took it apart after sitting so long that seal must have just rotted away cause I never saw one. I couldn't find a reference to it anywhere. And no wonder I was getting an exhaust leak. I was sliding the split spacers in first, followed by the pipe. I never thought of doing it the other way around where the spacers go in after the pipe but in front of the flange. Now it makes alot more sense. Thanks again guys. This forum rocks. -Beerbatter...

02-07-2006, 08:47 AM	#7 (permalink)
Beerbatter PM Newbie Join Date: Feb 2005 Location: Sunny Florida Posts: 24	Thanks daddy. Good site but no exploded views for old z50's. Hey Dirt, can you please double check on that part number. I did a search on it and the hit I got on it referred to the round rubber packing (#5 on your graphics) that goes inside the petcock. Thanks man! Last edited by Beerbatter; 02-07-2006 at 11:23 AM.

02-07-2006, 05:47 AM	#3 (permalink)
SprNtrl 3rd Gear Member Join Date: Jul 2005 Location: Toronto, Canada Posts: 1,183 My Mood:	Yea, those exhaust collars a pain in the a$$ to get in there. Takes some patience. With reagrds to the petcock leak, put the filter first, then slide the rubber collar on the petcock and down, tighten with a 17mm wrench.

02-07-2006, 08:13 AM	#5 (permalink)
Beerbatter PM Newbie Join Date: Feb 2005 Location: Sunny Florida Posts: 24	Oh, and one more thing for DirtBkr. Would you care to divulge where your getting that kind exploded parts data? I could really use that source. -Beerbatter.

02-07-2006, 08:15 AM	#6 (permalink)
daddysmut 3rd Gear Member Join Date: Dec 2004 Location: O-town florida Posts: 3,168	check www.bikebandit.com and welcome to our home

02-07-2006, 08:57 AM	#8 (permalink)
Z 5th Gear Member Join Date: Sep 2003 Location: KANSAS Posts: 8,540	Why not spend the $10 and get a brand new petcock and never worry about it again? Seriously. Sometimes it's just better to replace certain wear items then beat yourself up over the small stuff. Especially when your garage stinks like gas. http://www.hondatrailbikes.com/catal...roducts_id=395

02-07-2006, 11:22 AM	#9 (permalink)
Beerbatter PM Newbie Join Date: Feb 2005 Location: Sunny Florida Posts: 24	I here ya Z. I should have went that route in the first place, but I was trying to keep everything as original as possible. The original petcock was in perfect condition after I cleaned it, and I have already purchased the inner rubber disk and the replacement filter, so all that's missing is the little oring. I can go that route, but I hate to throw away everything I've done so far to preserve the original petcock body. Next time, I'll consider your advice for other parts, which I'm sure I'll need. -Beerbatter...

02-07-2006, 11:24 AM	#10 (permalink)
Z 5th Gear Member Join Date: Sep 2003 Location: KANSAS Posts: 8,540	For the rubber gasket you are wanting, call your local honda dealer and they will be able to look it up on the microfiche and you can order it up..

02-07-2006, 11:25 AM	#11 (permalink)
Beerbatter PM Newbie Join Date: Feb 2005 Location: Sunny Florida Posts: 24	Look what I just found doing some surfing. Well worth the visit if you need a shop manual and exploded parts list. http://www.hondaheaven.org/Album-ztypes.html

02-07-2006, 06:58 PM	#13 (permalink)
FastMC Sporting the Merkin Join Date: Mar 2004 Location: boston area Posts: 5,072 My Mood:	Usually when you order those fiter screens that go into the tank they come with the new o-ring.

02-08-2006, 08:59 AM	#15 (permalink)
Beerbatter PM Newbie Join Date: Feb 2005 Location: Sunny Florida Posts: 24	Dirt, thanks for the correction on the part number. You da man. I went home after your post and re-assembled the exhaust split ring spacers per your instructions and bingo, everything goes together great now and no exhaust leaks. I don't know why I was so blind to that assembly order cause I like to think of myself as a pretty good mechanic. Hey Fiddy, I would have expected the o-ring to come with the filter also, but none there. I haven't forgotten that I promised to post some pics. I've got the pics off the digital cam last night and I have to upload them to server so stay tuned.

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