08-11-2015, 12:30 AM | #31 | ||
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Quote:
You need to discover how the engine is now operating before you decide to try larger, or smaller jets. Quote:
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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08-11-2015, 12:39 AM | #32 | |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Quote:
If you can't tell the difference, I suggest you try both smaller and larger main jets. Get a main jet which is one size smaller, and a main jet which is one size larger than your current main jet. Your engine will perform better with one, than the other. From that point you can continue to experiment until you find the proper main jet. I wouldn't mess with that particular company, or 'performance jet kits' in general. You can save money, and have less frustration, if you experiment with individual jets and seek incremental improvements until you reach the final desired result.
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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08-11-2015, 07:41 AM | #33 |
Join Date: Mar 2015
Location: Florida
Posts: 88
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Thanks Weldangrind!! My motor is a 229cc I probably should have added that bit of info...it's a Yamaha 225 clone...with a 30mm Teikei cv carburetor... raptor yfz450 atv frame clone...Thanks again Matt
Ooops I posted this on the wrong thread!!! Last edited by bucklove; 08-11-2015 at 12:58 PM. |
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08-11-2015, 08:48 AM | #34 |
Join Date: Mar 2015
Location: Florida
Posts: 88
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Thanks for the reply!!! It seems to be starved...it has a K&N aftermarket air filter... the fuel mix screw is about 5 turns out from seated...(shouldn't stock be about 2??) The piolet jet is a 34....when I take off the air filter lid it pops n sputters n bogs down at wide open throttle (it starts from half throttle on) the main jet is a 96 (when I put the lid back on I don't notice the poping as much at full throttle but it still boggs in the last 1/4 wide open throttle ) ...what sizes should I get to figure them out??? I don't mind getting the mikuni jets if they won't damage the threads especially when their over half the cost!!! I just don't know how much to jump in sizes as a starting point!!! I'm working with a 229cc motor with a 30mm cv Teikei carburetor with 34 pilot jet n 96 main jet...n a K&N aftermarket air filter.... ther doesn't "feel" to be any disturbing acceleration in the first 3/4 of the throttle action except for the 5 turns of the fuel mix screw...the spark plug is white n dry ...n when I turn the fuelfuel screw to 2 turns from seated the exhaust pipe starts to heat up n it stalls out...thanks for your help, I hope I mentioned everything to inform you, thanks again Matt (I'm gonna stay with the stock exhaust for now)
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08-11-2015, 08:54 AM | #35 |
Join Date: Mar 2015
Location: Florida
Posts: 88
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08-11-2015, 09:47 AM | #36 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Based upon the following thread, I recommend you start experimenting with the following jets.
http://www.thumpertalk.com/topic/512...rket-upgrades/ Pilot Jet: Teikei size 40 Main Jet: Teikei size 125, or Mikuni size 130 I don't know where to find Mikuni pilot jets which fit the Teikei carburetor. I also suggest you visit the XT225 forum. http://www.xt225.com/forums/ubbthreads.php?ubb=cfrm In addition, I encourage you to read the following thread. http://www.chinariders.net/showthread.php?t=6501
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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08-11-2015, 12:48 PM | #37 |
Join Date: Nov 2007
Location: Kansas, USA
Posts: 228
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Would it be possible to replace that CV carb with a Mikuni VM26?. CV carbs don't seem to do well with low restriction air filters. You need a new throttle cable as well. But if the diameter of intake manifold lines up (perhaps you could even bolt on the intake manifold from another upright engine), it should be a bolt on swap. The VM26 works very well with 223CC motorcycle engines.
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2000 HD XL1200C 2006 Hi-Bird QH-250-GY 2004 150CC Dual Sport (Chongqing Xgjao) 1978 Honda CB750K 1977 Honda GL-1000 (Goldwing) Project/Parts bikes 1977 Honda CB-750K 1977 Honda CB-550F |
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08-11-2015, 01:01 PM | #38 |
Join Date: Mar 2015
Location: Florida
Posts: 88
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Thanks Spudrider!!! I ordered the Teikei main n pilot jets...we'll see how that goes when they get here ina week or so!! Also do I need to be concerned about the needle??? It's in the middle position right now and I'm at around 10ft sea level...
Rice e I thought about doing that but for now I'm gonna just go with the jets n see how it goes!!! Thanks!!! |
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08-11-2015, 02:48 PM | #39 | |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Quote:
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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08-11-2015, 05:43 PM | #40 |
Join Date: Mar 2015
Location: Florida
Posts: 88
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Ok!! Thanks for all your help SpudRider!!! Matt
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08-30-2015, 10:47 PM | #41 |
Join Date: Mar 2015
Location: Florida
Posts: 88
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Ok, Update!! I did a Z1 mod on the exhaust and put in a K&N air filter with an outerwear cover on it and took off the lid/cover. I put in the 130 main jet and didn't touch the pilot yet because it runs like a raped ape right now!! (But I will be checking it out soon but I just have'nt been riding it much as i've been replacing other things on it!!) I moved on to the clutch plates whitch are the same as the YZ85 and a handful of other Yamaha products... and some electronic parts. Time to learn about that now!! A service manual would be nice!!! But I cant seem to find one for this model anywhere!! Well thanks for your help!!! Matt
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08-31-2015, 12:07 AM | #42 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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I'm glad the 130 main jet worked so well for you. If you search, you can certainly find XT225 and TT-R225 service manuals available for download. Of course, you can also purchase a printed manual for both of these Yamaha bikes, which will include valuable information regarding the engine.
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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08-31-2015, 12:40 PM | #43 |
Join Date: Mar 2015
Location: Florida
Posts: 88
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Thanks!! I've thought about the manuals for a while, what really stumps me is the fact that everywhere I look it says it's a "YFM250" design (because of it being a 229cc I assume) BUT that motor is a shaft driven motor, and the whole bottom end is totally different!! (Except for the Raptor YFM250 engine which is obviously different) so do I need to buy both manuals??!!! And I've noticed the clutch side case is different by the kick start area but a kick start kit will fit and I'm going to install one of them...I'll post some pictures... it'd be nice if there was a 229cc XT/TT/TTR motor to buy the service manual to...but it seems that JIANSHE combined the XT225 bottom end with the YFM250 top end...I guess AND the really weird thing is I can not find ANY information on this motor 'except' that it's a YFM250 copy and if you look up the JIANSHE 229cc motor it comes up with the newer version of the Shaft driven model....oh well...Somewhere out there is the information!!!!
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08-31-2015, 12:42 PM | #44 |
Join Date: Mar 2015
Location: Florida
Posts: 88
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08-31-2015, 12:44 PM | #45 |
Join Date: Mar 2015
Location: Florida
Posts: 88
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