New to me KDX 220
-
- Member
- Posts: 3
- Joined: 07:15 pm Oct 23 2022
- Country: United States
New to me KDX 220
I got a 98 KDX220 a few weeks ago from a guy who said he had just replaced the piston with a wiseco one. I rode it around the block and it seem good. Once I got it home I rode around the block and it rode good (about two miles) then died while riding and wouldnt start. I pulled the carb to clean and then the reeds to inspect. The reeds looked like they had metal shavings in them… So i looked down in where the reeds had been and could see the back of the piston and it looked awful (see attached image) what could have caused this? I guess Im gonna pull the top end and see what it looks like. Will I need to split the cases to remove metal shaving?
- Molly's 70
- Platinum Member
- Posts: 569
- Joined: 04:29 pm Jun 18 2017
- Country: USA
- Location: Wichita, Kansas USA
Re: New to me KDX 220
Wow! That looks horrible. Take the top end off & take more pictures.
If you lend someone $20, and never see that person again, it was probably worth it.
-
- Member
- Posts: 49
- Joined: 10:05 am Mar 16 2022
- Country: Germany
Re: New to me KDX 220
It is zwo stroke… i dont think u need to split the case
- bufftester
- Platinum Member
- Posts: 3463
- Joined: 06:03 pm Oct 31 2012
- Country: USA
- Location: University Place, WA
Re: New to me KDX 220
If you have any shavings down in the bottom end (likely) then you should split them to properly clean and also check/replace the mains and seals. Being a new to you bike with a top end that just appeared to let go, better to have the peace of mind from doing a through tear down/inspection/rebuild. It is not hard and can be done with very few special tools, especially if you are handy with a wrench.
- Tyl3r
- Platinum Member
- Posts: 1338
- Joined: 06:51 pm Nov 26 2012
- Country: USA
- Location: SW Pennsylvania
Re: New to me KDX 220
ahh man, that is a bummer for sure! I had the same thing happen to me. I bought a 220 from someone who said it had a new piston in it. Rode it for a short time and the piston skirt let loose, locking it up. The stock cast pistons on the 220's are known for that, it needs replaced with a forged one, like a Wiseco. When it happened to me, I had to replace the head and I sent the cylinder to Millenium Technologies to repair and replate.
I did split the cases for peace of mind. It really wasn't that bad. In this day and age, you know someone has documented how to do it on the internet, making it even easier: viewtopic.php?f=77&t=12241&hilit=splitting+cases
Sorry for your luck! But its definitely fixable
I did split the cases for peace of mind. It really wasn't that bad. In this day and age, you know someone has documented how to do it on the internet, making it even easier: viewtopic.php?f=77&t=12241&hilit=splitting+cases
Sorry for your luck! But its definitely fixable
05 KX220 Hybrid all decked out
-
- Member
- Posts: 3
- Joined: 07:15 pm Oct 23 2022
- Country: United States
Re: New to me KDX 220
This is my first time trying to rebuild a bike so any advice helps! I took the cylinder off and found some interesting things, I will attach some pictures. It looks like one of the wrist pin clips fell out and caused a bunch of damage… I found the bent up clip down by the crank once i pulled the cylinder, you can see where it was in the attached pictures. I’m probably going to send the cylinder to powerseal usa, it seems like this is the best option. Im not sure what to do about the cylinder head though, it has lots of pitting, Im assuming this is from the metal shards bouncing around. Anyone have advice on what do about the head, can it be repaired? Looks like ill be spitting the case on my first rebuild as well haha. Thanks for the help!
- Attachments
-
- 1F7FCE9C-2CE8-4611-8729-9794E47080F2.jpeg (3.09 MiB) Viewed 1199 times
-
- 848D6AA7-5F64-4E75-9208-0F66BA299906.jpeg (3.36 MiB) Viewed 1199 times
-
- 8ABFEEFE-43F7-42BE-A7C0-86A1836DCD4D.jpeg (3.01 MiB) Viewed 1199 times
-
- DBBFFEDE-2901-47DB-ADE3-E848F65C4516.jpeg (3.95 MiB) Viewed 1199 times
-
- 195BC393-36C6-4A7C-A48B-5882B92D563E.jpeg (3.49 MiB) Viewed 1199 times
-
- Member
- Posts: 3
- Joined: 07:15 pm Oct 23 2022
- Country: United States
Re: New to me KDX 220
Tyl3r, thanks for the comment I think I posted again right when you replied. Sounds like I need to look for a new head! Also I’ll check out millennium technologies! Im glad there’s plenty of documentation on these bikes here, I’ll will be studying up on splitting the case haha!
- Tyl3r
- Platinum Member
- Posts: 1338
- Joined: 06:51 pm Nov 26 2012
- Country: USA
- Location: SW Pennsylvania
Re: New to me KDX 220
Ah hah, so they did replace the piston... just didn't get the wristpin in there right, bummer.
I was trying to get a RB-Designs modified head when I was putting mine back together, he told me mine couldn't be saved and I needed a new one, it looked a lot worse than yours though. Could send him an e-mail to see what he thinks or ask the place that repairs your cylinder for their opinion.
I was trying to get a RB-Designs modified head when I was putting mine back together, he told me mine couldn't be saved and I needed a new one, it looked a lot worse than yours though. Could send him an e-mail to see what he thinks or ask the place that repairs your cylinder for their opinion.
05 KX220 Hybrid all decked out
- SS109
- KDXRider.net
- Posts: 5808
- Joined: 05:11 am Aug 23 2009
- Country: USA
- Location: Tucson, AZ, USA
- Contact:
Re: New to me KDX 220
Ouch. Yep, typical circlip failure. The big worry is that where are all those little pieces? My bet is in your main bearings and, even if they're not still there, have probably caused damaged to them. IMO I would be splitting the cases and doing a complete crank/rod overhaul and new crank bearings seals.
Youtube Channel: WildAzzRacing
AZ State Parks & Trails OHV Ambassador - Trail Riders of Southern AZ
Current KDX: '98 KDX220
Old KDX: '90 KDX200 -White/Blue
'11 GasGas EC250R
AZ State Parks & Trails OHV Ambassador - Trail Riders of Southern AZ
Current KDX: '98 KDX220
Old KDX: '90 KDX200 -White/Blue
'11 GasGas EC250R
- Tyl3r
- Platinum Member
- Posts: 1338
- Joined: 06:51 pm Nov 26 2012
- Country: USA
- Location: SW Pennsylvania
Re: New to me KDX 220
05 KX220 Hybrid all decked out