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10-31-2016, 06:26 AM | #1 |
Join Date: May 2013
Location: finger lakes NY
Posts: 2,047
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as an fyi, my CB200 (163fml pushrod engine) runs right on the 340-365 range when I am riding... and that's pushing the wngine a bit... if I really flog it, I will see 375-400, and given new engine and tight parts, 400 isn't out of the realm of possibility, however I think your temps will come down a good 50 degrees with a fatter main jet...
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10-31-2016, 09:09 AM | #2 | |
Join Date: Oct 2016
Posts: 547
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Quote:
Those are more like what I would expect. I tore the carb top off last night and richened the needle position by moving the clip down 2 notches. I'll try it again tonight and see if it runs cooler. It also has fresh Mobil1 V-twin in the case now.
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1993 CR125 powered by Zongshen 223cc OHC 2̶0̶1̶6̶ ̶L̶X̶R̶ ̶2̶5̶0̶ ̶E̶F̶I̶ ̶ Sold 2018 GPX Moto FSE250R 1993 Fantic Key-Roo 250 |
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10-31-2016, 11:45 PM | #3 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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You might be really close at 110 at your elevation. Fine tuning, experimentation and plug reading will help you dial it in, but you already knew that.
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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 |
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11-01-2016, 08:41 AM | #4 |
Join Date: Oct 2016
Posts: 547
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Last night's ride was much better, but the ambient was also 20 degrees cooler. Temps stayed 360-375 for the most part. I did one "speed run" 5th gear high rpm that triggered my temp alarm at 392. The difference was this time the temperature dropped quickly as I slowed down.
My sprockets are 12/50 which is way too low for this motor. A 13t is on the way and I think it will help. Also going to try a 112 main, especially for cooler weather like this. It was 56F riding around last night; fun getting waved at by all the little trick-or-treaters!
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1993 CR125 powered by Zongshen 223cc OHC 2̶0̶1̶6̶ ̶L̶X̶R̶ ̶2̶5̶0̶ ̶E̶F̶I̶ ̶ Sold 2018 GPX Moto FSE250R 1993 Fantic Key-Roo 250 |
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11-01-2016, 11:50 AM | #5 | |
Join Date: Feb 2016
Location: George West, Texas
Posts: 4,097
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Quote:
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***************************************** 2015 Bashan"Blaze" BS250GY-31 (DB-07K-250) GONE 2017 Suzuki V Strom 650 XT "We are all born ignorant, but one must work hard to remain stupid." ~Benjamin Franklin~
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11-01-2016, 02:23 PM | #6 |
Join Date: Oct 2016
Posts: 547
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Just my usual ATTGAT.
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1993 CR125 powered by Zongshen 223cc OHC 2̶0̶1̶6̶ ̶L̶X̶R̶ ̶2̶5̶0̶ ̶E̶F̶I̶ ̶ Sold 2018 GPX Moto FSE250R 1993 Fantic Key-Roo 250 |
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11-01-2016, 07:07 PM | #7 | |
Join Date: Feb 2016
Location: George West, Texas
Posts: 4,097
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Quote:
Great costume , headless horseman!
__________________
***************************************** 2015 Bashan"Blaze" BS250GY-31 (DB-07K-250) GONE 2017 Suzuki V Strom 650 XT "We are all born ignorant, but one must work hard to remain stupid." ~Benjamin Franklin~
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11-01-2016, 10:08 PM | #10 |
Join Date: Oct 2016
Posts: 547
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Test Ride 3
OK. Another night, another glorious ride through town! No costumes this time!
My riding partner had a 115 Main jet and a 14 tooth counter sprocket, so i bee-lined over to his place after work. One confounding factor is that the temperature has dropped to 46F this evening. Also note that the sprocket cover would not fit with the 14 toother. Might be able to trim it out. The 115 main behaved well during warm up, I let it sit on half choke for a few minutes while I rounded up my DOT pumpkin hat and some warmer gear. It pulled hard and felt clean. Immediately noticed no more lean decel popping. Rode the same uphill route that I had the previous 2 nights- temps were 330-350 with a peak of about 375 at the top of the hill. Could be a combination of lower rpm and cooler temps so no significant conclusions there. Between town and my house there is a little stretch of highway, so I opened it up and managed to hit about 60 mph, but the revs were too high so I backed off. Accelerating up through the gears it was apparent that the motor ran out of steam at 9000rpm; it would just go flat. Noted that at 55MPH my tach was at 8000 rpm. After a quarter mile at 55MPH the temp was 387 and climbing, however it dropped as soon as I began to slow for my turn. Still seems hot, but I guess spinning 8K will do that to a motor. There was also a slight hesitation or surge when decelerating or cruising 1/2 throttle. Not always, but every once in a while it would cut out just a tiny bit. The 115 may be too big, or I need to drop the needle one clip. More tuning to do. And some re-gearing to figure out too. I think it would be nice if it would cruise at 55 at 6000rpm or less. Don't want to lose climbing gear either.
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1993 CR125 powered by Zongshen 223cc OHC 2̶0̶1̶6̶ ̶L̶X̶R̶ ̶2̶5̶0̶ ̶E̶F̶I̶ ̶ Sold 2018 GPX Moto FSE250R 1993 Fantic Key-Roo 250 |
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11-02-2016, 08:20 AM | #11 |
Join Date: May 2013
Location: finger lakes NY
Posts: 2,047
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are you running 40# or 50# chain on that? i have been curious if a 14t 50# sprocket fits these china motors, as my 13 is real close....LOL
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11-02-2016, 09:05 AM | #12 |
Join Date: Oct 2016
Posts: 547
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Its a 520 chain. Same one I ran on it all last summer. The 14T is very tight to get the chain on, but it clears the guard. Rubs on the cover, but it might be possible to "clearance" the section that rubs.
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1993 CR125 powered by Zongshen 223cc OHC 2̶0̶1̶6̶ ̶L̶X̶R̶ ̶2̶5̶0̶ ̶E̶F̶I̶ ̶ Sold 2018 GPX Moto FSE250R 1993 Fantic Key-Roo 250 |
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11-02-2016, 10:10 AM | #13 |
Join Date: May 2013
Location: finger lakes NY
Posts: 2,047
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good to know... you must be screaming to get 55 out of that sprocket combo... i have a 13-38 and i top out about 60 on flat land.... fastest i have ever hit was 72 downhill with the wind at my back...LOL you wouldnt happen to have the part# for that 14t handy would you?
as a side note.. i lost my sprocket cover a few yrs ago so no worries there.... |
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11-02-2016, 11:31 AM | #14 | |
Join Date: Oct 2016
Posts: 547
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Quote:
Playing around with a gearing calculator leads me to want to try a 14/45 which would be 10% higher than the 14/50 and should put 55MPH right at 6000rpm. That would allow me to swap the 13 on for those days of gnarly single track that we sometimes ride. Often 5-6 hours and we will only cover 30-40 miles. Fun stuff.
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1993 CR125 powered by Zongshen 223cc OHC 2̶0̶1̶6̶ ̶L̶X̶R̶ ̶2̶5̶0̶ ̶E̶F̶I̶ ̶ Sold 2018 GPX Moto FSE250R 1993 Fantic Key-Roo 250 |
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11-02-2016, 02:43 PM | #15 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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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.
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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 |
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