Cylinder inspection/ ugly marks on cylinder
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Cylinder inspection/ ugly marks on cylinder
I decided to check out and make sure the kips valves were all closed and hadn’t skipped/sheared any teeth on my e series kdx. That checked out fine. However I was caught off guard when I peered into the cylinder and noticed some markings in line with the bridges on the intake side. I always gave the engine a solid warm up before taking off. Doesn’t look good. What do you guys think could have caused this?
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2005 KDX220r 1991 KDX200 2022 KTM 500excf
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Re: Cylinder inspection/ ugly marks on cylinder
That doesn't look to be from a cold seizure. Did you check the ring gap? Were all ports chamfered?
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
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- Supporting Member II
- Posts: 569
- Joined: 12:36 pm Mar 28 2021
- Country: United States
Re: Cylinder inspection/ ugly marks on cylinder
I had Ken O’Connor rebuild this engine last year. Was stained and rusted to crap. So I assume he did make sure everything was correct. I noticed the marks are right in line with the bridges between the intake ports, about the same width as the distance between the ports. Pic for example.
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2005 KDX220r 1991 KDX200 2022 KTM 500excf
- SS109
- KDXRider.net
- Posts: 5796
- Joined: 05:11 am Aug 23 2009
- Country: USA
- Location: Tucson, AZ, USA
- Contact:
Re: Cylinder inspection/ ugly marks on cylinder
Hmm, makes me think the port wasn't chamfered. Is it a sharp edge on the ports?
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
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- Supporting Member II
- Posts: 569
- Joined: 12:36 pm Mar 28 2021
- Country: United States
Re: Cylinder inspection/ ugly marks on cylinder
I’ll have to dig in further and find out. Thanks
2005 KDX220r 1991 KDX200 2022 KTM 500excf
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- Supporting Member II
- Posts: 569
- Joined: 12:36 pm Mar 28 2021
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Re: Cylinder inspection/ ugly marks on cylinder
I don’t believe I ran the engine too lean. Used a 42 pilot, 1173l needle and 150-152 main. I understand it varies but I don’t think those sizes are too questionable. It did rev up quite high cold starting with the choke on using the 42 pilot but I was also religious with tipping the bike prior to get extra fuel and that helped remedy that.
2005 KDX220r 1991 KDX200 2022 KTM 500excf