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hello from kentucky.
November 27, 2012
12:58 pm
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gonzo
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November 27, 2012
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  it's been several years since i have rode a bike. i have been looking at buying a bobber with my bonus next febuary and buying a chopper with a 250cc motor on it as well around tax time.

 

  i was wondering if anybody on here is rding either of these bikes and what they think of them. does anybody make aftermarket parts for them? things like a choppier camshaft, better pipes, a bigger jet for the carb stuff performance minded. if i understand what i have been reading they are clones of honda motors. will the parts from a honda motor fit these motors?

November 27, 2012
2:54 pm
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River
Wheeling, West Virginia
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May 27, 2012
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Heey Gonzo..

..welcome to the forum.  I got my bobber last July, and have had a blast with it despite any issues.  Most common problem I know (and I had this problem also) was the tank leaking.  It appears that it's a cold pressed tank, with the mounting brackets welded on.  My broke at one of those welds.  I used Caswell's epoxy tank seal, so I would recommend sealing the tank even before it's first fill up.  Another had recommended that to me, but it was too late, I had already filled it.  Those of us that are here that have them have been finding parts.  Though I haven't done it yet.. jets are easy to find.  I don't know about the engines, I haven't gotten that far with mine yet.

I thought of mine more like a 'kit'.  Not much to build, but need to go through things thoroughly.  I'm always waiting for nice days now.. especially when I think of $6 a week for gas vs $60 a week for truck gas, lol.

No problems ... Only opportunities for solution.

November 27, 2012
3:21 pm
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gonzo
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November 27, 2012
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 the fuel milage was what i was looking at. i drive 50 miles one way to work. i figure if i can ride a bike for 90 days a year it will shave off alot of fuel price for me.

November 27, 2012
5:48 pm
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AlmonP
North Alabama
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Until we get them in our store these are the jets right here on eBay, 

http://www.ebay.com/itm/400228611286?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

I've used them and they work well. I rejetted an RTB with them.

I think you should be seeing around 75 to 80 mpg on the RTB as long as you use a smaller rear sprocket which will give it a lower cruise  rpm. I have not done the math but it takes forever to burn a tank.

The main thing you can do for this bike is to cut the exhaust pipe in half on the weld under the foot peg and pull the restriction crap out of the pipe. You will notice at least two or three times better throttle response and it has more pep as well as you can imagine after getting rid of the restriction. MPG should increase as well...

November 27, 2012
5:49 pm
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River
Wheeling, West Virginia
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May 27, 2012
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I know I sure saved a lot.  Just remember though, the bobber is a hardtail.  I know around where I live, it's not always a smooth ride. Smile

No problems ... Only opportunities for solution.

November 27, 2012
8:02 pm
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gonzo
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November 27, 2012
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 what else can be done to this bike so far to enhance performance? i read where you where thinking a sprocket 4 or 5 teeth less might pick up the top end speed, but how much would that take off the bottum end torque? i do remember reading you think first gear was short(in my book that means it was low geared) and that it ran out of gear on top end with motor left. that could mean the smaller sprocket would put the gear range about right cuase it sounds like it is geared to low right now.

 

  opening up the exhuast is the number one thing i planned to do. it allows the motor to breathe better.

 

does doing the performance mods we have talked about void the warrenty on the bike is the next question? if the place selling the bikes does the work will they still warrenty the bike? these are all things that need to be asked.

November 27, 2012
10:53 pm
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AlmonP
North Alabama
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I can't say that doing personal mods will void the warranty or not, just don't tell me about them if you have a warranty claim. wink wink :)

On any work we do to the engine we will still warranty it for the full six months from purchase. But we are also doing a lot of pressure testing to see how the engine mods will hold up. 

 

I can't remember if the stock RTB rear sprocket is a 42 or a 45, I think it's a 45. I have one bike running a 32 if you can believe that. Takes about 2k to 2.5k to get it rolling. A better choice would be a 36 or 37 I think. With the 32 you really never need to get into 5th gear until we have more power.

The main thing we have been doing to these bikes is head work. This winter I still plan on dropping a larger engine in one and figuring out the wiring harness to match something like a Honda TRX300 that has a lot of work done to the head. You can get around fifty hp out of that engine with a performance jug and the after market parts are already there. Ebay has lot's of TRX engines from $800 to 2k if you look around.

It just not cost effective to use a TRX300 engine and expect people to pay for the upgrade en mass. However, some people will. Heck I have 10k worth of carbon bicycle wheels for my time trial bike. I think there is a LOT of room for improvement.

November 28, 2012
11:24 am
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gonzo
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November 27, 2012
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god yes head work!! 10 years ago i purchased a set of 230cfm dart heads for a small block chevy. i took the brand new finished heads straight to the machine shop and had $4000 worth of work done to them. head work is as important as any other mod done to a gas engine. then getting the motor to breathe. the intake has to match up to the flow of the carb and the head and the camshaft has to match up as well. i see your comments on riding a bicycle. it is like this. you can biuld up your muscle mass and be fit as any man in the world, but when the time came to ride your bike you try to breathe through a straw. what have you come up with for the intake side? is the factory intake already able to handle a high cfm carb? have you ported the intake and bead blasted it?

 

  the reason i'm asking is i would love to have the 250cc motor pushing alot more than it should. there honestly isn't a better way to make power than cc's, but when you are limited to what you have you have to use what you got. maybe a bigger bored jug, a longer rod with a piston with the wrist pin set a little higher to clear the head(in the future).

 

  i understand the aftermarket parts aren't exactly there or should we say here!! LOL!!!  these engines are supposed to be clones of honda motors from what i have read. has anybody tried using any honda parts inside the engine? the parts could be here i don't know becuase nobody has said one way or the other.

 

  i know i want one of the bobbers and i want you to mod it out before it is shipped to me. a chopper will come a week or two later with the same mods done to it. i'm hoping my questions might get others to looking and seeing what can be done.

 

  getting the motor to breathe is just the first steps to making power. when you get it breathing right there are limitless possabilities!! i know a man who owns a machine shop. he makes his own custom ground camshafts and crank shafts. if i could get my hands on a cam shaft i'd say he could make one to start trying to make more hp on top of the mods you are doing already. not a huge lift long duration camshaft that would destroy all bottum end torque. something smaller that would be choppy enough at idle to turn heads to see what the hell that was. not harley choppy, but just enough that people know that just aint right in that motor.

November 28, 2012
6:32 pm
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AlmonP
North Alabama
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May 16, 2010
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I get what your saying and there is more than one way to skin a goat :) I think I want to get Chris back on the forums, he is our local engine master and the guy who does most of the work on bikes for us currently. He can get pretty deep into different ways to make more power. It's really easy, just requires more money to make it happen, which based on some of the toys you told me you have had in the past you already know all about laying the green down for more power.

I'm also attaching a photo of a 7/8" drag bar which we will be selling in black or chrome in our store soon. You guys are about to be blown away by all the stuff we will have.

56-9558C.jpg

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November 28, 2012
6:47 pm
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AlmonP
North Alabama
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We will also be selling a 7/8" clubman which Qingdao will love! This will go good with the RTB or the RTC-R.

56-9556BK.jpg

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November 29, 2012
12:57 am
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gonzo
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November 27, 2012
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 things may happen to where i can maybe get a bike sooner(i may sell a rifle). i have been on a few other sites and they are all saying a 35 tooth rear sprocket really wakes these bikes up. a 105 jet also helps out(which they are saying these bikes are now coming with that jet in them). how about another pipe for it? use the factory pipe if you have to pass emission tests(we don't in kentucky) and a pipe without a cat in it for when your done with emissions. they are saying the cat is rattling in the pipe. i have no problem cutting the pipe and pulling it out and welding it back up.

 

  my old lady hated the hot rods!! hated everything about them. i loved them. nothing like leaving the line at 5000 rpm and shifting gears at 9500rpm!! i'm used to uncapped headers and loud pipes, so i'm sure this bike won't be that loud to me. i have alot of high end toys right now at the moment. i shoot ibs score matches with benchrest rifles and idpa matches with pistols. i have one custom benchrest rifle i could sell and more than cover the price of the bike, the mods you are doing at the moment and shipping. i just hate to let that rifle go. it has set several international records. i'll just wait. i can't let that rifle go!!!

November 29, 2012
1:03 am
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gonzo
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November 27, 2012
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 oh yeah. when i order my bike i'll want it in flat black and all decals removed. i don't want the white stripes on it period!! we'll talk more later on. maybe by febuary you'll have a few more mods to make a little more power over what you have now. it would be sweet to get 45-50hp and more torque out of one of these motors wouldn't it!!!

November 29, 2012
2:02 am
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AlmonP
North Alabama
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May 16, 2010
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Matte black ones are hard to come by right now. I happen to have two new ones locally. One with a 32 tooth sprocket already on it and the flat bar. I think I told you about that one already.

You'll have to remove the stripes, that sounds like weekend project to me :)

 

This is the bike right here,

http://china-moto.com/cm/gallery/?album=all&gallery=2

 

Handlebar conversion on that bike,

 

http://china-moto.com/cm/china-moto-forum/dong-fang-rta-rtb-and-rtc-support/new-handlebar/

 

Jet upgrade on this bike,

 

http://china-moto.com/cm/china-moto-forum/dong-fang-rta-rtb-and-rtc-support/jet-upgrade/

 

And here is a photo of it today, this one has only 49 miles on it.

IMG_20121120_150257-1.jpgIMG_20121120_150348-1.jpgIMG_20121120_150358-1.jpg

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