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Posted by: 2manytoys
I tell any one that I can that the stock airbox on these Chinese atv's are junk. I put on a clamp on K&N. Works great and gave it a little more power.
Posted by: 2manytoys
smb05,
Looks like you are pretty handy. You should have good luck with the chinese quad. Mine have been great for about a year now. Kids were out in the snow today and had a blast. One more thing I would highly recommend is a better set of tires. The stock tires are junk. They are very stiff and makes the handling poor. I went from the stock size 18x9.5x8 rear / 19x7x8 front to a 20x9x8 rear/ 20x7x8 front and went with Fox A/T tires. They work awsome in the snow. The stock ones would just dig down and he would get stuck alot. The handling is way better. He loves it now.
Posted by: 2manytoys
I think the Fox A/T tires are a great tire for a kids atv. They work really in just about any situation. I bought them from Dennis Kirk for $130. I went up a few sizes because the first gear was about useless and in 3rd gear it would wind out at about 25-26mph. Now he can use first and 3rd gear doesnt wind out till about 32mph. That is plenty fast for my son. He can keep up with me at a good cruise speed. I think overall that they are decent atv for the money but like you said there is plenty of improvement to be made.
Posted by: mywifesquad
I think it looks real good to me smb05, And like 2manytoys says your a perfect person to have bought a chinese quad. With a few fabrication skills these can be decent quads. I had to change a few things on my wifes Yamoto myself. There is a few pics on my page of the mods if your interested.
Posted by: smb05
I just completed an Air Filter Mod for a 150cc Quad. Take a moment and check out my pictures of the mod and let me know what you think. Any comment is appreciated whether good or bad. I am looking for ways to improve the mod if possible. Haven't had the chance to take it out and test it, however, when I do, I will post an update.
I had to modify this air filter due to the fact that the original paper air filter rubber, even though it was properly tightened down, did not keep the dust from getting into my carb. Also, I was concerned with the placement of the air filter. Original design required me to dismantle the front-end (i.e.: seat, fuel tank, plastic, etc...) to get to it. After taking the air filter off, I then proceeded to take off the carb and found light dust. Fortunately, I caught this in time and no damage was done.
I went out and purchased the following items:
1-1/2" to 1-1/4" Pipe Reducer Price: $6.45 Found in plumbing section at Home Depot
1-1/2" Electrical Conduit Pipe Price: $0.00 Already had, but you can find it at Home Depot
Two (2) 1" Rubber Insulated Clamps Price: $1.25 each ~ Used for pipe support
UNI Air Filter No.: UP-4182AST Price: $16.95
Total Mod Cost: $25.90 plus tax
Posted by: smb05
This quad did not come with a stock air box, just an off-beat style K&N air filter that was clamped directly to the carb. Looks just like a K&N, but obviously it is not. With my mod and the UNI filter, quad now has a lot more low end torque, is faster and will even pop a wheelie going up hill in the driveway whereas before it would not even pull up off the ground.
Posted by: smb05
toomanytoys,
Thanks, the tires will be one of my next to do's. The tire size is what I was not sure of. Are those Fox A/T tires a good brand to go with? Haven't looked too much into tires yet . We mainly trail ride and don't have to worry about snow that much.
Next, I am also going to tackle making a rear rack for this thing. I'm going to try and design the rack for under thirty dollars hopefully. Trying to keep cost down as much as possible. Bought this quad because it was fairly inexpensive and do not want to put a lot of money into it. The more money I dump into it I should have just bought a Japanese Quad.
This little quad keeps me busy when I run out of other things to work on. What is cool, is that a person can modify these quads due to the fact that they have some design flaws that a person can try and improve on.
Thanks again for the tire info.
SB
Posted by: smb05
rocketmagnet,
With just the pipe mod did not have to rejet. But with the new filter mod it does look like I am going to have to rejet carb. I will post info once I find a place to buy new jets for these carbs.
Posted by: smb05
mywifesquad,
Thanks, I have looked at your pics numerous times to get ideas for my 150.
Right now the quad is running very lean. But I think I have narrowed the main and pilot jet down. Still looking for the Jet needle. Will have more info next week on the jets that I purchase. Right now though if anyone is interested the Carb is a Dekni PD24J. Main jet is 111, Pilot is 35, and jet needle DB4. I measured the jets and it looks like Keihin is the winner for the jets. Now Mikuni also has a main jet that might work. If any one has any other info on these jets I would really appreciate it. Any info helps.
Posted by: smb05
rocketmagnet,
Thanks for the info. Started to look at the site. Lots of good information there. Those guys are putting different carbs on their buggy's, that's cool. I was thinking of doing the same to my 150.
The 127.5 to 130 seems a little rich but I still need to go the site to see what they did. I was thinking of more in the lines of a 118 to 122 main, and a 40 to 45 pilot. Still need to find needle. I may pick up the 125 and 130 main anyways, never know. I will drill the main as a last resort.
I installed the power up kits in my CRF 150's. Basically the same mod as this. The main jet was a 98 and it went to 108 in their kit. Changed the needle and bushing and did not change the pilot. This was Honda's kit they sold. So I was thinking I would start by jumping up the same number of jets as they did.
Look into the electric choke conversion kit. Which 150 do you have? If you look at my pics, the Pipe Reducer Pic shows the manual choke cable. Price compare between a conversion kit or a new carb with manual cable. I can get the carb for $35.00 and the cable is $20.00. My throttle cable is on the right side of the carb is yours on the left? Also did your 150 come with a fuel filter installed. Mine did, leaked from day one. Replaced it with another one and it's picking up the black flakes your carb has in it.
There is a shop in town that sells the buggy's and quads. I will find out from them what they have done, will have more information on these jets tomorrow. Hope to start rejetting by Wednesday or Thursday.
Posted by: smb05
rocketmagnet,
Don't worry if you wreck your main jet, I just ordered a bunch of them. I will send one or two your way if you run into any trouble. As long as your carb is the PD24J. I'm not going to change out the needle. I agree with you, those guys did not change them out. Not only that, I could not locate a replacement. Not worth the time. I will just do the carb upgrade if I have to. I will P.M. you with the place where you can get the carb and cable.
Posted by: smb05
XMUDCAT22,
The silencer is a Big Gun Race Pipe. The pipe was used on one of my CRF150's. The pipe had to be modified to fit the BMS.
If you are still using the stock air filter I would strongly suggest that you replace it with a UNI or a K&N. If you do replace the filter, make sure to check your spark plug color to make sure the quad is not running lean. Rejet as necessary.
You really don't need to upgrade your pipe. I did mine mainly because the pipe had a USFS approved spark arrestor in it. Here is a nice replacement pipe to think about if you do decide to replace yours. Pipe The cost on the pipe is not that bad either.
Good Luck.
SB.
Posted by: smb05
XMUDCAT22,
A black plug indicates a rich condition. The first place to look would be the air filter, make sure it is clean. The next place to look would be the carb. I do not know what carb you have but make sure the choke is not on after warm up. I have done this before, I left the choke on in the middle position, the bike would lose power and sometimes stall. If you have a CV carb you may have a leaking fuel enrichment condition. This will occur if the heating element does not close once the circuit warms up. Since you removed the insides to your pipe you should be ok there. I would also clean your carb and you may want to adjust the valves.
SB.
Posted by: rocketmagnet
Nice job! Since you've changed your pipe and your air intake, have you changed your jet in the carb? I'm going to do this air filter to mine too. Thanks.
Posted by: rocketmagnet
Hey smb05.
I noticed that they do quite a bit of modding on buggynews.com to these same engines and they seem to use 127.5-130 for the main jet after changing to a uni filter and opening up the stock exhaust. The 127 can be acheived by drilling the existing jet with a #56 drill bit from Irwin tools.
My carb seems to be very similar only throttle is on the opposite side. I need to learn more about it first, but my main jet is 105. I have it apart right now because I had a lot of black flakes in my gas tank from the factory and they made their way into the carb. Since so many have trouble with the electric choke (fuel enrichment circuit) on these, I think I will jbweld the choke ports up, leaving one with a fuel line stub to put a primer bulb on for choke.
Let you know how it turns out. Thanks for the information.
Posted by: rocketmagnet
Oh the choke thing. Does yours have that electric choke? Apparently, it lets extra fuel in by default, then when the engine is warm, it activates and closes the port to reduce the amount of fuel to normal. So if something goes wrong with it, your quad will run well when cold and sputter and die at idle when warm... which mine does.
Posted by: rocketmagnet
Hey smb05. Thanks, you give me a lot to think about.
I don't really know much about my 150cc, but it is a GY6 Honda clone. I was just going to change the main jet, put in the uni (on order), open up my stock exhaust, and convert my carb to manual choke with a primer (as is shown on this page: http://www.rc-trucks.org/gy6-engine-performance.htm). I thought you should change the needle too, but the guys on buggynews haven't as far as I can tell and theirs work well. I drilled my jet yesterday so if I need to go back, I'll have to by one (they have them on bladepowersports.com). Going with a new carb might be better. I didn't know you could get one for these so cheap. I got one for my son's 110cc a while back on ebay for $60 or so and I thought that was a great deal. Where can you get one for $30? and what size is it. Mine is a 24mm CV carb like in the web site above. It has a diaphram that raises and lowers the needle which has its advantages and disadvantages and an electric plunger that blocks the fuel enrichment port when it warms up, at least in theory. I took my tank off and washed it out and got about a thousand black flakes out of it. I'll use a good fuel filter this time, not the factory cheap one and hopefully be ok. I'll let you know how everything turns out and I appreciate you doing the same. Thanks.
Posted by: XMUDCAT22
I WAS WONDERING WHAT TYPE OF SILENCER THAT IS YOU HAVE ON YOUR DAUGHTERS BLUE ATV...?...Thanks My daughter has a Hi-Bird cHINESE aTV 200ST AND WE ARE HAVING FILTER PROBLEMS
Posted by: XMUDCAT22
I just checked the Spark Plug it was black...I just finished test riding it and it still seems to not have that much power like it used to and its only 4 months old...I did take the exhasut off back when i purchased it and cleared out the header it had some restrictions,But that shouldnt have done any damage,from what I understand that should have helped...I just dont know what else to do to get more power out of it,sometimes when we are out trail riding she can barely make it up steep hills and it wont even pull a wheelie and in your video you seem to be ripping it up on yours,should I try and rejet and if so what size should i start with...Any help would be greatly appreciated...Thanks
