New member! Help me tell what cc my zongshen motor is???????

[humanbeing]

Originally Posted by Ironmike

.. need tq specs for head bolts/rocker assembly bolts...

TQ spec: Ref to CG125 shop manual https://josemaco.files.wordpress.com...h-62ktjam5.pdf
Yep, those are the correct seals.
---
Check it's all OK 1st when received the kit. Nameless rebuild kit tends had more hassle (Someone's BAD story http://www.mychinamoto.com/forums/showthread.php?8624) than those from reputable seller.

[Ironmike]

Originally Posted by humanbeing

TQ spec: Ref to CG125 shop manual https://josemaco.files.wordpress.com...h-62ktjam5.pdf
Yep, those are the correct seals.
---
Check it's all OK 1st when received the kit. Nameless rebuild kit tends had more hassle (Someone's BAD story http://www.mychinamoto.com/forums/showthread.php?8624) than those from reputable seller.

Appreciate the link! Just making sure in correct. According to the link cylinder bolts are 15 foot pounds and rocker bolts are 9 foot pounds? Just making sure those numbers are for ft pds? Thx

[Ariel Red Hunter]

Originally Posted by Ironmike

Ok. Think I'm gonna replace the valves/seals while it's apart. Any special break in process once I replace cylinder/piston/valves? I also need tq specs for head bolts/rocker assembly bolts ect I'm looking a this kit on eBay for $55. Says it comes with 2 oil seals (small blk things) are those valve seals? thx

Yes, I forgot to mention replacing the valve seals while it is apart, I guess that I thought you would do that automatically. Those numbers sound too low to me to be foot-pounds. Sounds like Newton-Meters to me...ARH

[Ironmike]

Originally Posted by Ariel Red Hunter

Yes, I forgot to mention replacing the valve seals while it is apart, I guess that I thought you would do that automatically. Those numbers sound too low to me to be foot-pounds. Sounds like Newton-Meters to me...ARH

Here's the tq specs human linked me to. Take a look and tell me if there in nm or ft pds ? Line 2 is cylinder bolts and line 4 is rockers thx

[Ariel Red Hunter]

Originally Posted by Ironmike

Here's the tq specs human linked me to. Take a look and tell me if there in nm or ft pds ? Line 2 is cylinder bolts and line 4 is rockers thx

I think if you go to AutoZone, you can rent a n/m torque wrench. I am sure that the Chinese are on the Metric System. That way you don't have to worry about a screwed up translation of the numbers...ARH

[Ironmike]

Originally Posted by Ariel Red Hunter

I think if you go to AutoZone, you can rent a n/m torque wrench. I am sure that the Chinese are on the Metric System. That way you don't have to worry about a screwed up translation of the numbers...ARH

I googled nm to ft pds and shows 15ft pds is 20nm

[Ariel Red Hunter]

Originally Posted by Ironmike

I googled nm to ft pds and shows 15ft pds is 20nm

If I was as smart as you are, I'd have thought of that myself!...ARH

[Ironmike]

Originally Posted by Ariel Red Hunter

If I was as smart as you are, I'd have thought of that myself!...ARH

Lol. Seems low to me to but quess I'm going with it

[JeremyC]

Is it me, or does it look like it may have been starving for oil at some point? Note the wrist pin where the rod journal rides..

[Megadan]

I see a lot of signs common of an air cooled motor that got too hot. Aside from the scuffing on the piston and cylinder, notice nthe impression from the oil control ring in the cylinder wall? Looks like the engine was soft seized at some point. A lack of proper oiling could definitely contribute to this. I agree with replacing the jug and piston.

[Ariel Red Hunter]

Originally Posted by JeremyC

Is it me, or does it look like it may have been starving for oil at some point? Note the wrist pin where the rod journal rides..

Yes, that varnish on the wrist pin definatley indicates either filthy oil run so long as to have lost its lubricating facility, or oil level so low that the oil got cooked. These engines run very little oil in the crankcase and air-cooled engines are at least 40% oil cooled, so it is essential to keep the oil level right up to the full mark. I have seen lawnmower engines like this before where the owner didn't clean the grass clippings/mouse nests out of the fins and/or ran the oil too long/too low...ARH

[Weldangrind]

Originally Posted by Ironmike

Here's the tq specs human linked me to. Take a look and tell me if there in nm or ft pds ? Line 2 is cylinder bolts and line 4 is rockers thx

That chart listed three different units, but you only need to pay attention to the right column and ignore the middle and left.


Starting vertically from the top of the right column, you see 24, 15, 7 and 9 ft/lbs.

[Weldangrind]

While you're buying new parts for your motor, you can select a high-compression piston that would match the bore. I'm sure that Humanbeing can point you in the right direction. That would squeak out a little more hp that you're seeking.

[Ironmike]

Originally Posted by Weldangrind

While you're buying new parts for your motor, you can select a high-compression piston that would match the bore. I'm sure that Humanbeing can point you in the right direction. That would squeak out a little more hp that you're seeking.

Dang already ordered. Didn't see anything about high comp piston option? I would like to purchase one even though I already have standard piston coming. Plz advise where to order that. As far as the songs of over heating ect. I thought the same thing. Human where you at

[humanbeing]

Modding CG200
Those 凸 https://item.taobao.com/item.htm?id=10145674020 http://item.taobao.com/item.htm?id=13899418088 is for stock CB156 (early CRF150F had SAME bore/stroke). Will it works? No one had exact answer. As i said b4 in http://chinariders.net/showpost.php?...95&postcount=2 that maker's page is useful to distinguish common chinese piston btw. Higher c/r can archived by lowering the height (ie. Thinner gasket...)
---
1-2 degree can gained by playing around the alternator (PiTA to get it done right)