Customize my D250RTC

[Homebuilt84]

Hey guys, I wanted to set up this thread for when I start to modify my 250rtc. I remember reading something from a guy who said not to modify if you ever plan on reselling your bike. I honestly have no interest in selling it. I will keep it till it runs into the ground even if I own another bike. I am posting a pic of the stock bike and then my rough drawing of what it will look like when I am mostly done. I hope to start a movement with custom chinese bikes. Show the world that I really can mod anything you put in front of me. Post your progress and custom work. I look forward to having people with me start this movement.

[mototech77]

Hey guys, I wanted to set up this thread for when I start to modify my 250rtc. I remember reading something from a guy who said not to modify if you ever plan on reselling your bike. I honestly have no interest in selling it. I will keep it till it runs into the ground even if I own another bike. I am posting a pic of the stock bike and then my rough drawing of what it will look like when I am mostly done. I hope to start a movement with custom chinese bikes. Show the world that I really can mod anything you put in front of me. Post your progress and custom work. I look forward to having people with me start this movement.

I have the same bike. I have considered dropping it some in the front, but would have to find an adjustable mono-shock to fit the rear. Might need to put on a steering damper if the rake angle gets changed too much so it doesn't get squirrely. Let us know how it works out. I'd like to see it. I ordered a 35-tooth sprocket for the rear, and am researching a re-jet for the carburetor.

[anthony.parris4]

what is the size of the carb on that

[mototech77]

what is the size of the carb on that

It is a Deni PZ30 with a 42mm inlet. The stock main jet is a 105 which I measured with a small drill bit to be approx. .038". I drilled it out to .051" after installing a performance air intake. The bottom end and midrange are better, but top end is a little rich. I'm trying to find replacement jets to experiment with a little smaller jet size to see how it works.

[anthony.parris4]

ok so you are staying they come jetted stock? would you recomend drilling it out? and how much of an increase in speed did you recieve when you did im looking to try and get 90 mph out of it

[mototech77]

ok so you are staying they come jetted stock? would you recomend drilling it out? and how much of an increase in speed did you recieve when you did im looking to try and get 90 mph out of it

No, they come with standard jets and a fairly restricted airbox. I got an angled-mount high-performance air filter kit from eBay. The reduction in air restriction causes the air/fuel mixture to become too lean. I drilled out the main jet to make up for this. Unfortunately, since I went a little too big it is too rich at wide open throttle so I actually did not get a top end increase. If you choose to drill it out, do it in small increments so you don't go too far with it. I would try to find a spare main jet too if you can. Supposedly, this carb is a Keihin PZ30 clone, so maybe spare jets for that carb would fit? I will have to try to find some or I will need to buy another carburetor. These bikes are geared low also. If you want to increase the top speed, you will need to get a smaller rear sprocket. You can get them from http://china-moto.com/cm/store/#ecwi...=0&sort=normal Be warned though that their sprockets are made of aluminum and have a shorter lifespan than the steel ones. I am trying to find a steel one, but have had no luck. Let me know if you find one.

[anthony.parris4]

It is a Deni PZ30 with a 42mm inlet. The stock main jet is a 105 which I measured with a small drill bit to be approx. .038". I drilled it out to .051" after installing a performance air intake. The bottom end and midrange are better, but top end is a little rich. I'm trying to find replacement jets to experiment with a little smaller jet size to see how it works.

what would u recommend the finish drill size