Planet Minis

1998 Honda Z125R · 03-04-2008, 11:53 AM

I have a 71 sl70 engine that i am rebuilding. So far a have rebuilt the tranny and clutch, got it bored over .05mm, rebuilt carb, cleaned everything and have it ready to go back together with all new parts; minus the cylinder head.

I have the head torn down and everything is good except the cam journal is worn and scored. Only 1 cam journal is worn, it is the journal on the clutch side of the motor. I know DRATV has a race cam with needle bearings that would work perfect, but i want a stock grind cam. The camshaft that was in this head is in good condition. Also the head has the casting number (M3) by the exhaust port.

What should i do? I dont want to buy a new head, but i would settle for a good used one. Are there any stock grind cams that use needle bearings? Any other options?

Z · 03-04-2008, 12:00 PM

Any 6V CT70 head is going to be the same as the SL70 head. Used 6V CT70 heads are cheap and easy to find.

BlackBeard · 03-04-2008, 12:01 PM

five21 is selling one in the classifieds under ct parts all stock in great condition.

1998 Honda Z125R · 03-04-2008, 12:14 PM

Thank you for your help. I contacted five21 about his ct70 head.

Is there any other routes i could go?

firepower354 · 03-04-2008, 01:58 PM

You could turn the end of your cam down for a bearing.

fatcaaat · 03-04-2008, 02:59 PM

I think you should be able to run a honda passport camshaft. It would be the same grind but have the bearing on the end.

1998 Honda Z125R · 03-05-2008, 09:41 AM

I could turn the end of my cam down and put a bearing on it.

I looked all over for a passport camshaft but i couldnt find anything. I think that would be the easiest way to go and the most reliable because it would use all honda parts. Where can i find one.

1998 Honda Z125R · 03-08-2008, 09:32 AM

what would you guys do in my situation???

03-04-2008, 11:53 AM	#1 (permalink)
1998 Honda Z125R 1st Gear Member Join Date: Mar 2007 Location: Florida Posts: 243	Sl70 Cylinder Head Rebuild ???? I have a 71 sl70 engine that i am rebuilding. So far a have rebuilt the tranny and clutch, got it bored over .05mm, rebuilt carb, cleaned everything and have it ready to go back together with all new parts; minus the cylinder head. I have the head torn down and everything is good except the cam journal is worn and scored. Only 1 cam journal is worn, it is the journal on the clutch side of the motor. I know DRATV has a race cam with needle bearings that would work perfect, but i want a stock grind cam. The camshaft that was in this head is in good condition. Also the head has the casting number (M3) by the exhaust port. What should i do? I dont want to buy a new head, but i would settle for a good used one. Are there any stock grind cams that use needle bearings? Any other options?

03-04-2008, 12:00 PM	#2 (permalink)
Z 5th Gear Member Join Date: Sep 2003 Location: KANSAS Posts: 8,540	Re: Sl70 Cylinder Head Rebuild ???? Any 6V CT70 head is going to be the same as the SL70 head. Used 6V CT70 heads are cheap and easy to find.

03-04-2008, 12:01 PM	#3 (permalink)
BlackBeard "ZBBT" Join Date: Oct 2007 Location: 50 riders Posts: 1,836 My Mood:	Re: Sl70 Cylinder Head Rebuild ???? five21 is selling one in the classifieds under ct parts all stock in great condition.

03-04-2008, 12:14 PM	#4 (permalink)
1998 Honda Z125R 1st Gear Member Join Date: Mar 2007 Location: Florida Posts: 243	Re: Sl70 Cylinder Head Rebuild ???? Thank you for your help. I contacted five21 about his ct70 head. Is there any other routes i could go?

03-04-2008, 01:58 PM	#5 (permalink)
firepower354 Advertiser Join Date: Oct 2006 Location: Flint MI Posts: 10,989 My Mood:	Re: Sl70 Cylinder Head Rebuild ???? You could turn the end of your cam down for a bearing. __________________ If it has my name on it I did it;) FirepowerMinis.com Custom FPM parts and engines. Parts and service for all makes. Honda Trail Bikes parts and accessories. Pitster/Piranha/Thumpstar bikes, parts, engines and accessories.

03-04-2008, 02:59 PM	#6 (permalink)
fatcaaat 3rd Gear Member Join Date: Sep 2004 Location: Arlington, VA Posts: 3,778	Re: Sl70 Cylinder Head Rebuild ???? I think you should be able to run a honda passport camshaft. It would be the same grind but have the bearing on the end.

03-05-2008, 09:41 AM	#7 (permalink)
1998 Honda Z125R 1st Gear Member Join Date: Mar 2007 Location: Florida Posts: 243	Re: Sl70 Cylinder Head Rebuild ???? I could turn the end of my cam down and put a bearing on it. I looked all over for a passport camshaft but i couldnt find anything. I think that would be the easiest way to go and the most reliable because it would use all honda parts. Where can i find one.

03-08-2008, 09:32 AM	#8 (permalink)
1998 Honda Z125R 1st Gear Member Join Date: Mar 2007 Location: Florida Posts: 243	Re: Sl70 Cylinder Head Rebuild ???? what would you guys do in my situation???

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