DF250RTG Front Sprocket Options

Indianaman · 09-29-2019, 01:11 PM

I am looking to lengthen my gears a bit with a bigger front sprocket on my DF250RTG. Does anyone know where to find sprockets for it? I believe the engine is the 165FMM 223cc. Thanks in advance!

Indianaman · 09-29-2019, 03:02 PM

I have attached a couple of pictures of my bike, only mods so far is a led gauge cluster and led headlight

Indianaman · 09-29-2019, 04:28 PM

No, it’s just my name. My parents had a sense of humor I suppose. I am going to check those out. I haven’t even looked at the stock one yet, was just hoping someone would know off the top of their head.

culcune · 09-29-2019, 05:05 PM

Your engine, according to the DOT/EPA certification list, has Zongshen as the OEM. Either way, you can pretty much get the same sprocket as the XR250, but your limitations might occur at how much room you have once you remove the cover. 17 tooth is ideal for street, but some people (not necessarily with Dongfangs) have found the 17 a bit too big and they need to sand down things to get it to fit. Barnone would be the one to ask.

Barnone · 10-01-2019, 08:17 AM

I haven't felt the need to change the gearing on my DF250RTG. It seems to be geared just fine for riding here in the mountains as it is all two lane curves and elevation changes here. This area is motorcycle riding Mecca.

Indianaman · 10-01-2019, 04:00 PM

I believe I've found the answer.

https://www.amazon.com/Wingsmoto-Spr...9958416&sr=8-6

This is the same sprocket listed on Venom Motorsports website that they are selling for $60. I did a little digging and have found that the difference between the CB250 and CG250 is that the CB uses a 17mm shaft, whereas the CG uses a 20mm.

*I think.

Anyways, I went ahead and ordered this one. If it doesn't fit, its prime so I get free returns.

Once I get around to putting it on, I will confirm fitment and report performance changes.

Indianaman · 10-03-2019, 04:30 PM

I thought wrong. The 17mm shaft is too small and does not fit. I will continue the search for a larger sprocket that fits. The bike currently revs about 5.5k at 50mph in 5th gear which is a little on the high side for cruising in my opinion.

Any suggestions are much appreciated.

**JerryHawk250** · 10-03-2019, 04:40 PM

Being that it's Honda CB clone you probably will use the same sprocket as the Hawk. Check the dimension against the one on Amazon.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Take some measurements and spline count and post so we can help find the right one. pictures help too.

Indianaman · 10-03-2019, 05:50 PM

I think you’re right. I’ll give that a shot.

Barnone · 10-03-2019, 06:16 PM

Quote:

Originally Posted by Indianaman

I think you’re right. I’ll give that a shot.

How many teeth is stock on the DG250RTG? You going to 17?

Indianaman · 10-03-2019, 08:46 PM

Mine has a 15 front. I don’t know about the rear. But after holding up the 17 to the shaft, I think a 17 may be too big. Seriously, MAYBE a fingernail would fit between the chain and engine case on the front. I don’t really want to take a grinder to my brand new engine just yet, so I’m going to go with a 16 next. I don’t need 70mph out of this bike, I just want 5th gear a little later.

Indianaman · 10-03-2019, 09:18 PM

I wish I had calipers handy so I could just measure the stock one and be done with it. Maybe barnone has a pair and will measure his and share dimensions with the class

Indianaman · 10-03-2019, 10:41 PM

I’ve found out that the Apollo DB36 RX uses the same engine, but I can’t find anything on the front sprocket for it either.

Barnone · 10-03-2019, 10:48 PM

Quote:

Originally Posted by Indianaman

I wish I had calipers handy so I could just measure the stock one and be done with it. Maybe barnone has a pair and will measure his and share dimensions with the class

My calipers are in Florida. I ordered one but won't be here until the 7th.

Indianaman · 10-03-2019, 10:56 PM

Well if you find the time, it would be real cool of you to measure it up 👍🏿👍🏿

09-29-2019, 01:11 PM	#1
Indianaman Join Date: Sep 2019 Location: Georgia Posts: 62	DF250RTG Front Sprocket Options I am looking to lengthen my gears a bit with a bigger front sprocket on my DF250RTG. Does anyone know where to find sprockets for it? I believe the engine is the 165FMM 223cc. Thanks in advance!
	0

09-29-2019, 05:05 PM	#4
culcune Join Date: May 2006 Location: Yuma, Arizona Posts: 9,035	Your engine, according to the DOT/EPA certification list, has Zongshen as the OEM. Either way, you can pretty much get the same sprocket as the XR250, but your limitations might occur at how much room you have once you remove the cover. 17 tooth is ideal for street, but some people (not necessarily with Dongfangs) have found the 17 a bit too big and they need to sand down things to get it to fit. Barnone would be the one to ask. __________________ "They say that life's a carousel, spinning fast you got to ride it well..." TGB Delivery Scooter 150 TMEC 200 Enduro--carcass is sadly rotting in the backyard
	0

10-03-2019, 04:40 PM	#8
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,565	Being that it's Honda CB clone you probably will use the same sprocket as the Hawk. Check the dimension against the one on Amazon. https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1 Take some measurements and spline count and post so we can help find the right one. pictures help too. __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
	2

09-29-2019, 04:28 PM	#3
Indianaman Join Date: Sep 2019 Location: Georgia Posts: 62	No, it’s just my name. My parents had a sense of humor I suppose. I am going to check those out. I haven’t even looked at the stock one yet, was just hoping someone would know off the top of their head.
	0

10-01-2019, 08:17 AM	#5
Barnone Join Date: Feb 2007 Posts: 1,354	I haven't felt the need to change the gearing on my DF250RTG. It seems to be geared just fine for riding here in the mountains as it is all two lane curves and elevation changes here. This area is motorcycle riding Mecca.
	1

10-01-2019, 04:00 PM	#6
Indianaman Join Date: Sep 2019 Location: Georgia Posts: 62	I believe I've found the answer. https://www.amazon.com/Wingsmoto-Spr...9958416&sr=8-6 This is the same sprocket listed on Venom Motorsports website that they are selling for $60. I did a little digging and have found that the difference between the CB250 and CG250 is that the CB uses a 17mm shaft, whereas the CG uses a 20mm. *I think. Anyways, I went ahead and ordered this one. If it doesn't fit, its prime so I get free returns. Once I get around to putting it on, I will confirm fitment and report performance changes.
	0

10-03-2019, 04:30 PM	#7
Indianaman Join Date: Sep 2019 Location: Georgia Posts: 62	I thought wrong. The 17mm shaft is too small and does not fit. I will continue the search for a larger sprocket that fits. The bike currently revs about 5.5k at 50mph in 5th gear which is a little on the high side for cruising in my opinion. Any suggestions are much appreciated.
	0

10-03-2019, 05:50 PM	#9
Indianaman Join Date: Sep 2019 Location: Georgia Posts: 62	I think you’re right. I’ll give that a shot.
	0

10-03-2019, 08:46 PM	#11
Indianaman Join Date: Sep 2019 Location: Georgia Posts: 62	Mine has a 15 front. I don’t know about the rear. But after holding up the 17 to the shaft, I think a 17 may be too big. Seriously, MAYBE a fingernail would fit between the chain and engine case on the front. I don’t really want to take a grinder to my brand new engine just yet, so I’m going to go with a 16 next. I don’t need 70mph out of this bike, I just want 5th gear a little later.
	0

10-03-2019, 09:18 PM	#12
Indianaman Join Date: Sep 2019 Location: Georgia Posts: 62	I wish I had calipers handy so I could just measure the stock one and be done with it. Maybe barnone has a pair and will measure his and share dimensions with the class
	0

10-03-2019, 10:41 PM	#13
Indianaman Join Date: Sep 2019 Location: Georgia Posts: 62	I’ve found out that the Apollo DB36 RX uses the same engine, but I can’t find anything on the front sprocket for it either.
	0

10-03-2019, 10:56 PM	#15
Indianaman Join Date: Sep 2019 Location: Georgia Posts: 62	Well if you find the time, it would be real cool of you to measure it up 👍🏿👍🏿
	1