So I was riding a sand track and....

Andy_White
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Andy_White
Today I went to local sand track after having my carbs adjusted on my 2017 ktm 150sx. After riding for a few hours I was getting a binding feeling in my throttle.... I ignored it since I figured it was from the couple of tip overs I had since sand and I haven't been acquainted in quite some time. After leaving and washing the bike I got home and noticed on the top of the carb where the needle and spring sit there was a bolt that was completely gone.... thus causing the binding of the throttle. I removed the remaining bolt and ran a paper towel down the wall of the carb and I felt sand..... should I be concerned and completely remove the carburetor and clean it?
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MotoX85
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MotoX85 10/23/2016 7:59pm
10/23/2016 7:59pm
You'll need a new engine, be prepared.
jeffro503
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jeffro503 10/23/2016 8:00pm
10/23/2016 8:00pm
Andy_White wrote:
Today I went to local sand track after having my carbs adjusted on my 2017 ktm 150sx. After riding for a few hours I was getting...
Today I went to local sand track after having my carbs adjusted on my 2017 ktm 150sx. After riding for a few hours I was getting a binding feeling in my throttle.... I ignored it since I figured it was from the couple of tip overs I had since sand and I haven't been acquainted in quite some time. After leaving and washing the bike I got home and noticed on the top of the carb where the needle and spring sit there was a bolt that was completely gone.... thus causing the binding of the throttle. I removed the remaining bolt and ran a paper towel down the wall of the carb and I felt sand..... should I be concerned and completely remove the carburetor and clean it?
Dear god , yes! Hopefully not much if any got past the slide. But yes , I would tear that carb down and check every inch of it before you re-install and run it. I'd double check the reeds and so forth too. A couple grains of sand can play havoc on the entire top end.
zehn
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zehn 10/23/2016 8:01pm
10/23/2016 8:01pm
Sand in carb likely means sand in cylinder... Who adjusted the carbs? Definitely pull the carbs and clean them.
jeffro503
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jeffro503 10/23/2016 8:02pm
10/23/2016 8:02pm
MotoX85 wrote:
You'll need a new engine, be prepared.
I wouldn't go that far. Those two 2 strokes are pretty resilient and can hold up to a lot of abuse. Btw , might wanna pull the head off and check things out as well if you see anything near the reeds.

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aeffertz
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aeffertz 10/23/2016 8:03pm
10/23/2016 8:03pm
Rebuild or at least tear it down and clean before you cause more damage. Top end kits are cheap enough.
colintrax
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colintrax 10/23/2016 8:04pm
10/23/2016 8:04pm
Pull the carb apart, remember Yamaha got in trouble for carb slides sticking due to flaking chrome. Hate to see someone die from a grain of sand.
Also, pull the cylinder. You need to make sure no sand got in there, doesn't take much to wreck the top and bottom end.
Andy_White
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Andy_White 10/23/2016 8:07pm
10/23/2016 8:07pm
Just adds to the list of issues I've had with the bike since I bought it. I had the carbs done since I came off a four stroke and I know the tmx carbs are super finicky. It doesn't feel super grainylated past the slide but I will take the carb completely off and clean it throughly tomorrow.
MotoX85
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MotoX85 10/23/2016 8:09pm
10/23/2016 8:09pm
MotoX85 wrote:
You'll need a new engine, be prepared.
jeffro503 wrote:
I wouldn't go that far. Those two 2 strokes are pretty resilient and can hold up to a lot of abuse. Btw , might wanna pull...
I wouldn't go that far. Those two 2 strokes are pretty resilient and can hold up to a lot of abuse. Btw , might wanna pull the head off and check things out as well if you see anything near the reeds.
35 years as a mechanic says....new motor, from the crank up.
Andy_White
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Andy_White 10/23/2016 8:18pm
10/23/2016 8:18pm Edited Date/Time 10/23/2016 8:20pm
MotoX85 wrote:
You'll need a new engine, be prepared.
jeffro503 wrote:
I wouldn't go that far. Those two 2 strokes are pretty resilient and can hold up to a lot of abuse. Btw , might wanna pull...
I wouldn't go that far. Those two 2 strokes are pretty resilient and can hold up to a lot of abuse. Btw , might wanna pull the head off and check things out as well if you see anything near the reeds.
MotoX85 wrote:
35 years as a mechanic says....new motor, from the crank up.
Hopefully that's not the case... anyone have any insight to where to get a top end kit for a '17??
kzizok
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kzizok 10/23/2016 8:21pm
10/23/2016 8:21pm
jeffro503 wrote:
I wouldn't go that far. Those two 2 strokes are pretty resilient and can hold up to a lot of abuse. Btw , might wanna pull...
I wouldn't go that far. Those two 2 strokes are pretty resilient and can hold up to a lot of abuse. Btw , might wanna pull the head off and check things out as well if you see anything near the reeds.
X2.
colintrax
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colintrax 10/23/2016 8:30pm
10/23/2016 8:30pm
MotoX85 wrote:
35 years as a mechanic says....new motor, from the crank up.
I think most people consider a new motor, an all new motor. Meaning cases, cylinder, head. Not the consumables you're referring to.
colintrax
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colintrax 10/23/2016 8:32pm
10/23/2016 8:32pm
Andy_White wrote:
Hopefully that's not the case... anyone have any insight to where to get a top end kit for a '17??
Your dealer, ktmworld.com, ebay, amazon. Same top end as the 16.
Don't bother buying anything till you pull the jug, it might be perfectly fine. Might need a new crank, piston/rings, cylinder recoated, and crank bearings. Don't take but 30 minutes to pull the jug.
Andy_White
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Andy_White 10/23/2016 8:40pm
10/23/2016 8:40pm
Andy_White wrote:
Hopefully that's not the case... anyone have any insight to where to get a top end kit for a '17??
colintrax wrote:
Your dealer, ktmworld.com, ebay, amazon. Same top end as the 16. Don't bother buying anything till you pull the jug, it might be perfectly fine. Might...
Your dealer, ktmworld.com, ebay, amazon. Same top end as the 16.
Don't bother buying anything till you pull the jug, it might be perfectly fine. Might need a new crank, piston/rings, cylinder recoated, and crank bearings. Don't take but 30 minutes to pull the jug.
Thanks for the reply, what exactly am I looking for when I pull the jug. I'm pretty amature when I comes to two stroke working parts but I'm sure I can figure it out. I'm in the process of pulling the carb now..
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kzizok 10/23/2016 8:43pm
10/23/2016 8:43pm Edited Date/Time 10/23/2016 8:44pm
Andy_White wrote:
Thanks for the reply, what exactly am I looking for when I pull the jug. I'm pretty amature when I comes to two stroke working parts...
Thanks for the reply, what exactly am I looking for when I pull the jug. I'm pretty amature when I comes to two stroke working parts but I'm sure I can figure it out. I'm in the process of pulling the carb now..
Score marks, cylinder, piston, etc. Even having not seen it before, pretty easy to tell.

What is compression like?
Andy_White
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Andy_White 10/23/2016 8:51pm
10/23/2016 8:51pm
I'll have to get a compression tester tomorrow
colintrax
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colintrax 10/23/2016 8:56pm
10/23/2016 8:56pm
Andy_White wrote:
Thanks for the reply, what exactly am I looking for when I pull the jug. I'm pretty amature when I comes to two stroke working parts...
Thanks for the reply, what exactly am I looking for when I pull the jug. I'm pretty amature when I comes to two stroke working parts but I'm sure I can figure it out. I'm in the process of pulling the carb now..
As said, look for vertical marks on the cylinder and piston. Check the coating isn't chipped off anywhere (shouldn't be)
And lastly check that all the bearings spin free. The piston should smoothly rock on the connecting rod, without any vertical play. The connecting rod should smooth spin on the crankshaft, again without any vertical play. The crankshaft should also spin freely without any vertical play, but it's a little harder to feel because you will be spinning some gears. You also have to pull up with some effort to be sure there's no play, because crankshafts are so heavy.
colintrax
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colintrax 10/23/2016 8:57pm
10/23/2016 8:57pm
If you got any questions post pictures on here or take it to your dealer. A bad bearing in the crank can wreck havoc; connecting rod will break off, and destroy the cases.
Katoomey
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Katoomey 10/23/2016 8:58pm
10/23/2016 8:58pm
what's up with the janky thread bait you hoser.

this thread belongs in raceshop, where people there can have 3 minutes of their life wasted....

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Andy_White
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Andy_White 10/23/2016 9:11pm
10/23/2016 9:11pm
colintrax wrote:
If you got any questions post pictures on here or take it to your dealer. A bad bearing in the crank can wreck havoc; connecting rod...
If you got any questions post pictures on here or take it to your dealer. A bad bearing in the crank can wreck havoc; connecting rod will break off, and destroy the cases.


Andy_White
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Andy_White 10/23/2016 9:12pm
10/23/2016 9:12pm
Katoomey wrote:
what's up with the janky thread bait you hoser.

this thread belongs in raceshop, where people there can have 3 minutes of their life wasted....
I know I'm an idiot. I was just sort of in a hustle and I was whoring myself out for replys and I figured this was the best corner with the most customers...
kzizok
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kzizok 10/23/2016 9:13pm
10/23/2016 9:13pm
Man, just a pic, but looks pretty good. However, still is quite a bit of the cylinder that isnt seen.
colintrax
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colintrax 10/23/2016 9:16pm
10/23/2016 9:16pm
Well looking good but you still need to pull the cylinder.
Also, are those white spots sand? If so clean it out asap
Andy_White
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Andy_White 10/23/2016 9:19pm
10/23/2016 9:19pm
That's what I thought after I took the picture but it's just reminants from the paper towel. I'm in the process now
mingham97
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mingham97 10/23/2016 9:59pm
10/23/2016 9:59pm
Andy_White wrote:
Just adds to the list of issues I've had with the bike since I bought it. I had the carbs done since I came off a...
Just adds to the list of issues I've had with the bike since I bought it. I had the carbs done since I came off a four stroke and I know the tmx carbs are super finicky. It doesn't feel super grainylated past the slide but I will take the carb completely off and clean it throughly tomorrow.
Did you play with the brand new carburettor?? I hate playing with brand new stuff because there's always a chance of it getting busted up, especially if you're like me and have no real idea what you're doing. How ever, I'm a firm believer in religious maintenance so don't take me for an idiot either lol

I really feel for you because those new KTM 125s and 150s look soo good. Would hate to be in your position rn
Andy_White
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Andy_White 10/23/2016 10:03pm
10/23/2016 10:03pm
Well after taking the cylinder head off there is defiantly sand on the walls, but it doesn't really seem to have any scratches... which kind of has me thinking the bolt possibly came loose while I was pressure washing the bike. So now I guess it leads me to the next question of how to rid the sand that's in the engine.
DuneRider250
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DuneRider250 10/23/2016 10:04pm
10/23/2016 10:04pm
Sand is hard on everything, might want to also look into putting outerwear over your air filter. Hell pantyhose if anything
Andy_White
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Andy_White 10/23/2016 10:04pm
10/23/2016 10:04pm
Andy_White wrote:
Well after taking the cylinder head off there is defiantly sand on the walls, but it doesn't really seem to have any scratches... which kind of...
Well after taking the cylinder head off there is defiantly sand on the walls, but it doesn't really seem to have any scratches... which kind of has me thinking the bolt possibly came loose while I was pressure washing the bike. So now I guess it leads me to the next question of how to rid the sand that's in the engine.


Andy_White
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Andy_White 10/23/2016 10:05pm
10/23/2016 10:05pm
I'll post pictures of the piston tomorrow
colintrax
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colintrax 10/23/2016 10:13pm
10/23/2016 10:13pm Edited Date/Time 10/23/2016 10:17pm
If sand got in there it should need a new piston and honing min. No way pressure washing got sand into the cylinder, it got sucked in.
Don't forget to check the bearings

When you look for scratches in the cylinder, hold it up to a light as if you're checking the bore of a gun.
Andy_White
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Andy_White 10/23/2016 10:28pm
10/23/2016 10:28pm
colintrax wrote:
If sand got in there it should need a new piston and honing min. No way pressure washing got sand into the cylinder, it got sucked...
If sand got in there it should need a new piston and honing min. No way pressure washing got sand into the cylinder, it got sucked in.
Don't forget to check the bearings

When you look for scratches in the cylinder, hold it up to a light as if you're checking the bore of a gun.
Awesome, thanks for all the help I really do appreciate it. I'll post more pictures when I get the free time to tear it the rest of the way down. Definite bummer seeing how the iron man is this weekend Dry

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