Odd build - Page 4

bogieboy · 11-02-2016, 03:27 PM

Quote:

Originally Posted by Weldangrind

You could certainly have more gearing options if you switched to a 428 chain like these motors normally power. That said, it'll be a challenge to find a 428 rear that'll fit a CR wheel.

same issue i have with the sumo conversion.... 420 spec'd sprockets are non existant for the rear wheel....

ChondaChondaChonda · 11-02-2016, 03:33 PM

I prefer to stay 520 just to have commonality of spares with my riding compadres. Ordered up a 45 tooth PBI rear sprocket today.

ChondaChondaChonda · 11-11-2016, 11:19 PM

Mounted the 45 tooth sprocket and shortened the chain one link. Bike is really a smooth cruiser now. The temperature was mid 40's and the 115 main jet is spot on at this altitude and temp.
Motor seems stronger with the longer legs. Going to take it out this weekend for a long off-road trial run.

ChondaChondaChonda · 11-14-2016, 10:20 AM

41 miles of very technical desert single track yesterday. The Zong motor performed flawlessly!!

First little while it ran ok.... then something happened and it just flat out ran amazing for the rest of your trip. Looking at the temperature log on my Trailtech shows that I hit 415 degrees early in the day and after that it never went over 400 all day. Break-in seems to be happening.

The torque of this thing is awesome. I can now steer with the throttle input again. It will also pull 3rd gear in places I couldn't before. My riding buddy was on a bored/stroked 218 with a custom cam. Ever since he built that motor I couldn't keep up with him... I still can't in the tight stuff, but now the Zong seems to at least allow me to reel him in on the faster straight sections.

The only downside I can see is the loss of the 6 speed. With the higher gearing this motor requires to hit 55, my first gear isn't near as low as my old setup. Might just take some getting used to. We climbed some pretty gnarly rock walls and a few loose, loose silty sections. As long as I could keep my ground speed up it wasn't a problem.

Lovin' the Zong after this outing!!

BlackBike · 11-14-2016, 10:46 AM

Quote:

Originally Posted by ChondaChondaChonda

41 miles of very technical desert single track yesterday. The Zong motor performed flawlessly!!

First little while it ran ok.... then something happened and it just flat out ran amazing for the rest of your trip. Looking at the temperature log on my Trailtech shows that I hit 415 degrees early in the day and after that it never went over 400 all day. Break-in seems to be happening.

The torque of this thing is awesome. I can now steer with the throttle input again. It will also pull 3rd gear in places I couldn't before. My riding buddy was on a bored/stroked 218 with a custom cam. Ever since he built that motor I couldn't keep up with him... I still can't in the tight stuff, but now the Zong seems to at least allow me to reel him in on the faster straight sections.

The only downside I can see is the loss of the 6 speed. With the higher gearing this motor requires to hit 55, my first gear isn't near as low as my old setup. Might just take some getting used to. We climbed some pretty gnarly rock walls and a few loose, loose silty sections. As long as I could keep my ground speed up it wasn't a problem.

Lovin' the Zong after this outing!!

And saved a ton...way to go

ChondaChondaChonda · 11-15-2016, 10:21 AM

crackerjac · 02-22-2017, 01:47 PM

Not sure why your thread didn't come up when I searched but it would have answered some needless posts I made, lol.

Question, just to be clear, in the end what did you convert your motor to? I believe you said it was a ZS169FMM which is 69mmx62.5mm - 232cc but you found a kit to make it 247cc?

ChondaChondaChonda · 02-22-2017, 03:23 PM

Crackerjac, My ZS169FMM is still stock internally.

It turns out that the 250cc cylinder I purchased has a larger bolt pattern than these 230 (223) cc clones. Won't work.

My bike does have a new Honda Keihin carb and a Powr-roll exhaust header. Runs really, really well.

ChondaChondaChonda · 04-03-2018, 09:37 PM

Decided that I needed to give this bike some love. It's been neglected since I picked up the Pitster LXR 250.

Member Chadzu ordered this Otom stainless header for his 230 powered XR200, but decided it would not work and gave it to me. I had hoped it might fit the LXR, but not even close.

With a little effort I was able to fit it up to this old Chonda;
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Weldangrind · 04-04-2018, 11:51 AM

Did you have to bend it?

ChondaChondaChonda · 04-04-2018, 12:35 PM

Quote:

Originally Posted by Weldangrind

Did you have to bend it?

No, but the depth of the exhaust flange was wrong, so I had to make an extension about 1/2" long and weld it to the stainless pipe.

It exits at a little more "outward" angle, so I did weld a bend from the original tailpipe in to re-align it with the Supertrapp muffler. I'll grab a few more pics. This was a late night snap.

I also mounted the original tank from my Pitster LXR250 on this bike along with the seat; it really changes the whole look and feel of the bike. Gives it a modern, sleek, low look that it was definitely missing with that old KX tank it had on it.

franque · 04-04-2018, 09:03 PM

Can you get some more pictures of the engine mounts? I'd love to do something like this!

ChondaChondaChonda · 04-04-2018, 09:43 PM

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david3921 · 04-08-2018, 07:11 PM

Quote:

Originally Posted by ChondaChondaChonda

Attachment 12527

Attachment 12528

Attachment 12529

What is the purpose of the upper pipe? I don't think I've seen one before.

ChondaChondaChonda · 04-08-2018, 07:25 PM

I'm guessing it's a resonance chamber. Sometimes called helmholtz chambers.

From Wikipedia :
The theory of Helmholtz resonators is used in motorcycle and car exhausts to alter the sound of the exhaust note and for differences in power delivery by adding chambers to the exhaust. Exhaust resonators are also used to reduce potentially loud and obnoxious engine noise where the dimensions are calculated so that the waves reflected by the resonator help cancel out certain frequencies of sound in the exhaust.

In some two-stroke engines, a Helmholtz resonator is used to remove the need for a reed valve. A similar effect is also used in the exhaust system of most two-stroke engines, using a reflected pressure pulse to supercharge the cylinder (see Kadenacy effect.)

Probably just for looks on this pipe.

11-02-2016, 03:33 PM	#2
ChondaChondaChonda Join Date: Oct 2016 Posts: 547	I prefer to stay 520 just to have commonality of spares with my riding compadres. Ordered up a 45 tooth PBI rear sprocket today. __________________ 1993 CR125 powered by Zongshen 223cc OHC 2̶0̶1̶6̶ ̶L̶X̶R̶ ̶2̶5̶0̶ ̶E̶F̶I̶ ̶ Sold 2018 GPX Moto FSE250R 1993 Fantic Key-Roo 250
	0

11-11-2016, 11:19 PM	#3
ChondaChondaChonda Join Date: Oct 2016 Posts: 547	Mounted the 45 tooth sprocket and shortened the chain one link. Bike is really a smooth cruiser now. The temperature was mid 40's and the 115 main jet is spot on at this altitude and temp. Motor seems stronger with the longer legs. Going to take it out this weekend for a long off-road trial run. __________________ 1993 CR125 powered by Zongshen 223cc OHC 2̶0̶1̶6̶ ̶L̶X̶R̶ ̶2̶5̶0̶ ̶E̶F̶I̶ ̶ Sold 2018 GPX Moto FSE250R 1993 Fantic Key-Roo 250
	0

11-14-2016, 10:20 AM	#4
ChondaChondaChonda Join Date: Oct 2016 Posts: 547	41 miles of very technical desert single track yesterday. The Zong motor performed flawlessly!! First little while it ran ok.... then something happened and it just flat out ran amazing for the rest of your trip. Looking at the temperature log on my Trailtech shows that I hit 415 degrees early in the day and after that it never went over 400 all day. Break-in seems to be happening. The torque of this thing is awesome. I can now steer with the throttle input again. It will also pull 3rd gear in places I couldn't before. My riding buddy was on a bored/stroked 218 with a custom cam. Ever since he built that motor I couldn't keep up with him... I still can't in the tight stuff, but now the Zong seems to at least allow me to reel him in on the faster straight sections. The only downside I can see is the loss of the 6 speed. With the higher gearing this motor requires to hit 55, my first gear isn't near as low as my old setup. Might just take some getting used to. We climbed some pretty gnarly rock walls and a few loose, loose silty sections. As long as I could keep my ground speed up it wasn't a problem. Lovin' the Zong after this outing!! __________________ 1993 CR125 powered by Zongshen 223cc OHC 2̶0̶1̶6̶ ̶L̶X̶R̶ ̶2̶5̶0̶ ̶E̶F̶I̶ ̶ Sold 2018 GPX Moto FSE250R 1993 Fantic Key-Roo 250
	1

11-15-2016, 10:21 AM	#6
ChondaChondaChonda Join Date: Oct 2016 Posts: 547	__________________ 1993 CR125 powered by Zongshen 223cc OHC 2̶0̶1̶6̶ ̶L̶X̶R̶ ̶2̶5̶0̶ ̶E̶F̶I̶ ̶ Sold 2018 GPX Moto FSE250R 1993 Fantic Key-Roo 250
	1

02-22-2017, 03:23 PM	#8
ChondaChondaChonda Join Date: Oct 2016 Posts: 547	Crackerjac, My ZS169FMM is still stock internally. It turns out that the 250cc cylinder I purchased has a larger bolt pattern than these 230 (223) cc clones. Won't work. My bike does have a new Honda Keihin carb and a Powr-roll exhaust header. Runs really, really well. __________________ 1993 CR125 powered by Zongshen 223cc OHC 2̶0̶1̶6̶ ̶L̶X̶R̶ ̶2̶5̶0̶ ̶E̶F̶I̶ ̶ Sold 2018 GPX Moto FSE250R 1993 Fantic Key-Roo 250
	1

02-22-2017, 01:47 PM	#7
crackerjac Join Date: Sep 2016 Posts: 103	Not sure why your thread didn't come up when I searched but it would have answered some needless posts I made, lol. Question, just to be clear, in the end what did you convert your motor to? I believe you said it was a ZS169FMM which is 69mmx62.5mm - 232cc but you found a kit to make it 247cc?
	0

04-03-2018, 09:37 PM	#9
ChondaChondaChonda Join Date: Oct 2016 Posts: 547	New update Decided that I needed to give this bike some love. It's been neglected since I picked up the Pitster LXR 250. Member Chadzu ordered this Otom stainless header for his 230 powered XR200, but decided it would not work and gave it to me. I had hoped it might fit the LXR, but not even close. With a little effort I was able to fit it up to this old Chonda;
	1

04-04-2018, 11:51 AM	#10
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Did you have to bend it? __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
	0

04-04-2018, 09:03 PM	#12
franque Join Date: Nov 2017 Location: Marseille, France -> Conakry, Guinea Posts: 1,481	Can you get some more pictures of the engine mounts? I'd love to do something like this!
	0

04-04-2018, 09:43 PM	#13
ChondaChondaChonda Join Date: Oct 2016 Posts: 547	Pics of Otom exhaust
	1

04-08-2018, 07:25 PM	#15
ChondaChondaChonda Join Date: Oct 2016 Posts: 547	I'm guessing it's a resonance chamber. Sometimes called helmholtz chambers. From Wikipedia : The theory of Helmholtz resonators is used in motorcycle and car exhausts to alter the sound of the exhaust note and for differences in power delivery by adding chambers to the exhaust. Exhaust resonators are also used to reduce potentially loud and obnoxious engine noise where the dimensions are calculated so that the waves reflected by the resonator help cancel out certain frequencies of sound in the exhaust. In some two-stroke engines, a Helmholtz resonator is used to remove the need for a reed valve. A similar effect is also used in the exhaust system of most two-stroke engines, using a reflected pressure pulse to supercharge the cylinder (see Kadenacy effect.) Probably just for looks on this pipe.
	0