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Posted by: oldyeller
Putting larger jets in a properly tuned carb won't make it run faster it will just make it run richer and hurt performance...For more power and speed you could make the engine bigger with a larger piston/cylinder or go with a bigger carb and performance pipe or do all three for really big gains....Try WRH racing or hetricks etc to see what package is good for you.
Posted by: Fastestdad
REmove the front variator restrictor too. It's the wedding band looking thing in between the front clutch halves. Or get a better variator for cheap. You'r bike will need rejetted with the exhaust mod and it will run MUCH better and not run hot. More air requires more fuel. Always. You can get your "Round slotted head mikuni mainjets" at most any cycle shop for $3 . With the exhaust mod you need to go up 2 jet sizes. I cant remember what stock is but it's on the jet itself. The 90s have a 77.5 to 82.5 stock depanding where they are sold. A 70cc kit will help as will a 35 tooth rear sprocket instead of the 50 for topend, or a WRH, Hetrick pipe and clutching to match will make it scream and topout about 40 mph. If you want to run good gas a 70 kit setup with the compression setup right has a lot of torque and topend. The topend is under $150 or so for the whole topend. You can even get a 15-1 setup that runs really good. They more than double the output of the 50s.
Posted by: Fastestdad
I dont think the bomb has a restricted cdi. I know most of the 90 bombs dont. You'll know if it does cause it will bounce off it and cut out off and on every 1/2 second or so. Bah Bah Bah Bah and not pull. A Kymco is a Kymco not a Bombardier, DRR, Arctic cat there are a few differences in the bikes. Yes look at your spark plug if it's light tan or grey rejet it up 1 or 2 sizes and try that. If it's a nice rootbeer brown then it's OK. Darker than that and it's too rich and needs jetted down. As for using a pilot and mainjet from a 90 cause it's not restricted thats not right at all. Glad it's running well for you.
Posted by: Fastestdad
Did you read the first page of this post?
Posted by: ROTTY261
Someone please correct me if I am wrong. But letting a quad (or anything) rev beyond what the engine is designed for could cause excessive engine wear and/or breakage right? I just assume there are better ways to speed something up without excessive RPM's. If I am wrong I will be out buying new CDI's for all four of our quads...
Posted by: vmutt
Im still new to the site, and to riding. I bought my son an 05 DS50. Even with the thing being new, it will stall and not run untill it got home. I have posted on here to find out what I can do, but I didnt get a clear answer. After reading some of the post from this thread, I wonder if you guys may help me out. Its a huge bummer when we are out riding and the thing stops. For a while it will start up by just changing the plug, but as time has gone by that wont even work. At first a friend thought the fuel wouldnt go thru the filter, so he rand it direct, and it did run great for a while. A while later it would stop once again. Usually when I get home after riding, when I pull it off the trailer just his luck the thing would start.(kind of late for that). So for my sons riding sake, can someone please help.
Thanks,
Posted by: JetTurbines
OK. I finally got my kid's stock DS50 running more like it ought to. But, now looking for a little bit MORE top end... Here's what I've done so far:
1) removed slug from intake tube.
2) removed SA screen and exhaust end cap. Enlarged exhaust tip output hole.
3) bought new $12 Taiwanese race CDI box and wired it up.
...his 50 runs a LOT quicker now and isn't limited at the top end except for jetting and/or carb size. All for an hour's light work and $12 + shipping!
So, where can I buy larger jets for this carb/ Or should I just increase the carb itself? Any help greatly appreciated. Thanks!
Posted by: JetTurbines
I agree, but the greater amount of fuel/air mixture you can get into (and subsequently out of) an engine, the greater the HP without adding cc's/inches...after all, we're just processing as much compressed air as possible. I can see that opening up intake/altering exhaust capabilities will accomplish that...then maybe shave the head a few thousandths to increase compression is probably the cheapest way to go for me.
The CDI I bought from Scooter-Assassins.com works like a charm- It removed the governor and advanced the spark. The Bomb has more low-end torque and higher top speed. Even the wire coding matched up without guesswork. I found it on Ebay for $12+7 shipping. Definitely the best investment so far.
And thanks for the WRH website---I contacted them regarding a pipe for it.
Mike
Posted by: JetTurbines
Wow that's all great information! Thanks a lot. I'll go the "jet" route first, then "variator" route next. I'll do a google search for Hetrick and see what I can come up regarding a pipe, as well. Thanks again!!!
Posted by: JetTurbines
I removed the variator ring and yes it made a great difference! Getting the crank nut off of this virgin motor was a little tedious,
but I made a tool to lock the variator while wrenching and it went easily after that. The clutch cover gasket was pretty tight too, but that's expected.
Next/final thing is to jet it up one or two sizes and re-check the plug.
The quad is now just about as fast as it needs to be for my kid until he gets better on it. What a world of difference $12 and some simple
wrenching made!
Thanks for your help!!!!
Mike
Posted by: JetTurbines
Like I mentioned (above) Yes, the CDI in a DS50 restricts the RPM top end. The one I replaced ours with was from Scooter Assassins off or Ebay and it definitely made the quad much better. No more sputtering at RPM and top end definitely increased. It's a lot quicker, as well. Pretty simply soldering installation, and color-coded wires even matched up. Good times now, for sure.
Posted by: JetTurbines
Well, I just did an ebay search for "CDI box" about 4 months ago and read all of the text I could tolerate about them on MANY auctions. There were many!
"Scooter Assassins", on EBay, actually sells them....around $12 if I remember right. They ship from Taiwan, and were expeditious. Look for the one which mentions bombardier in the text. Wish I could remember more-
The one I got soldere in just perfectly and quad fired up immediately. VERY PLEASED (for cheap!!!!!!!) thanks, Mike
Posted by: JetTurbines
OK- I found a link on Ebay to on elike I put on the DS50- Here you go and hope it helps!
Mike
http://cgi.ebay.com/ebaymotors/Yamaha-ATV-Mini-Quad-50-Eton-Dinli-Blue-RACE-CDi-box_W0QQitemZ290070624642QQihZ019QQcategoryZ43976QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Also, here's their website:
www.scooter-assassins.com
Posted by: check
FASTESTDAD, I removed the variator from my daughter's Arctic Cat DVX50 (which made it go faster), but do I need to rejet as well, or can I just leave it at that? You mentioned something about running hot that worries me.
Als, I taked to the Kymco guys at the Motorcycle show here in Toronto last weekend, and the said I should also disconnect the green wire that runs into the CDI box, because it is also a restrictor. Sound familiar?
Posted by: check
Good for you, JetTurbines.
I was told by a Mimco rep that I could just disconnect one of the 4 wires that PLUG into the CDI box on my daughter's 2006 Arctic Cat DVX50, and he even showed me the releveant wires on the Kymco Mongoose 50 he had there. (Kymco apparently makes a lot of the parts for the '06 AC DVX50.)
When I looked at the CDI box on our Arctic Cat, however, I found,;
1.) a 4-plug connector with only 3 plug-in wires (one green, one black with a yellow stripe, and one blue with a yellow stripe,
2.) a 2-plug connector with only 1 (black) wire plugged in.
The CDI box itself was labelled "30400 PWAS-900 2006 Jan"
So, does anyone know if it is the green wire I disconnect, or is there perhaps no CDI limiter wire on the quad?
James
Posted by: cocoinc
I read on previous emails that replacing the CDI on a DS50 (2004) with one from a DS90, and also the Main and Pilot Jet from a 90 would increase top speed since the 90 does not have a limiter. So I went to the Bombardier website and looked up the part numbers but the CDi for the 90 says C.D.I Unit (5900RPM) which leads me to believe that it is also lmited, since I would guess it will rev higher than that no? Is it one from an older ds90? I am confused as to what I need to do since I don't want to lose reliability since I have another son inline waiting for that 50.
Posted by: cocoinc
My son's DS50 sputters at high rpms it does not cut off. I was told by Bomabardier that was normal because of the CDI limiter. I ordered a non-restricted one from Scooter assasins, we'll see when it arrives. I wonder if I have another issue in addition to the cdi, so much for the mechanics at the Bombardier dealer.
Posted by: gmc400ex
I too have a ds50 and can not find a cdi, what part number and brand of cdi did you get?
I have to of these quad and would like to make them faster.
Lou
Posted by: gmc400ex
Thanks for the quick reply, I will check it out and order. I checked for the ds90 cdi which I read somewhere that it had no rev limiter and worked on ds50. Thay want $89.....ouch
Will check and thanks again.
Lou
Posted by: gmc400ex
http://www.provoscooter.com/shop/product_info.php?cPath=30&products_id=87
this web site show's great how to's. They are on scooters but they are them same motors on these tiawanese (sp?) motors.
hope this helps sombody.
Posted by: gmc400ex
I traced the wires to that silver thing and it ended up to the electronic choke. (on the carb)
Posted by: gmc400ex
Where exactly is the slug on the intake? Do I need to take the reeds out with intake? I have an 04 and 05.
Posted by: Drewsome
i have been searching for some help in removing the governors from a 2006 arctic cat 50. sounds like you have it licked. i got the part about the slug in the intake tube, but what is the sa screen? do you have a link for the cdi box? i called the dealership about removal and was told the carb had to come off and the trans cover had to be removed. i can handle both of these, im just not sure what to look for. im just trying to get a little more pep out of this thing. nothing extreme. thanks
Posted by: teampacifica
Thanks fellas all this has been great and usefull, Now I have a bigger problem went to restart quad after son got off, it sat for about 30 min and will not restart, NO SPARK I think! replaced plug still nothing anyhelp will be apreacciated. Also how do I get rid of oil injection is it easy! and do you reccomend getting rid of the oil injection
Posted by: teampacifica
I just bought a manual on e-bay just type in bombadier ds 50 manual and they send it to you on disk! I think the seller is like foxmoto manuals or something if you cant find it write back and ill find my invoice for you!
---Still waiting to see if anyone has any info on the no spark and oil injection, and where is the slug in the intake I cant find it!
Posted by: jutcie
i just bought a ds 50 2002 bombadier for my son and was wondering where i can get a good used service/repair manual for it.if anyone has one for sale please let me know.also any suggestions on how to make it alittle faster without engine work please let me know.i was told i can remove something in the intake and install a cdi box limiter.any info would help.thanks ..peter
Posted by: jutcie
i just bought a 2002 bombardier ds50 for my son and it feels like it is rev'd out when full throttle.any way of making the 50 faster without engine work?i was told i can remove a slug in the intake and replace the cdi box.is this all safe to do for the engine?also was looking for some wheel spacers to make it a bit wider.anyone know of a company that sell aftermarket proformane parts for this quad?any help would be great...thatnks...also does anyone know where i can get a good used service/repair manual for this quad.thanks...peter
Posted by: jutcie
i looked for the foxmoto manual link but cant find anything.could you try to find the invoice and give me a number?thanks alot.maybe fastestdad can help you out with your no start condition,he seems to have alot of knowledge about these little quads. good luck.wish i could help but i'm just getting into this sport/hobby so i dont know much.thats why i ask stupid questions.
Posted by: jutcie
jetTurbines,does your electric start and your kill switch still work after installing the cdi?also,isnt the slug/brass washer inside the carb?i called hetricks today and they said there was a brass washer in the carb that has to taken out by removing the 2 screws on top of the carb.and has to be pulled out the top.(is that true?)(is that what you did?) and there is there anything in the intake pipe?thanks.
Posted by: g22bob
Does the CDI box from Scooter Assassins come with directions? It doesn't look like it matches up. I have a 2002 DS50. I see another box in there 1 1/2" X 1 1/2" silver in color with a 4 wire plug the schematics say this is a "pacifier" does that mean restictor? I unpluged it and ran fine just not faster. what the heck is this thing if it runs the same with or without it pluged in???
Posted by: g22bob
The "slug" is a metal washer welded into the intake tube from the air cleaner. Pull off the tube (metal pipe) and on the carb end of the tube you should find the washer. I used my Dremel tool to grind off the weld, be careful the washer is stronger than the tube, you don't want to bend the tube. Also clean all the metal shavings off so they don't get in the engine.
Posted by: g22bob
Silver box is electic choke...that makes sense, thanks
Posted by: g22bob
Things to try: Clean spark arrestor screen and air filter. Jetting?? Oil injector, spark plug gap (when it is running good shut if off and check the plug this may help with jetting).
My kids DS crapped out one day, it idled perfect but would not rev up... dealer replaced the CDI box and it's happy trails.
Posted by: g22bob
I just got the "race" cdi from Quad Squad on ebay for $25. They sell a regular one for $12 and had a "race" one for $30 or best offer and was able to get it $25. They told me the race cdi advances the timing at lower rpms for faster acceleration. I got it in the mail straight from tiawan in 7 days. The connector doesn't match up but the wires are all exactly the same color (snip snip, splice splice). It started right up and WOW, it revs way more now.
