Yfm 350 Knocking engine

[Matthewthompson]

Hi I'm new to this site and hoping to find people that can help me. My Yfm 350 engines knocking quick loudly does anyone know of any common problem what it could be, thinking it's about 1999 model but not sure on that on as well if anyone has an idea on how to tell? Thanks very much

 

[bomber315]

either your valves need adjusted or it is normal. this motor does make a decent amount of "ticking" even when it is right

 

[Warrior1996]

Check the vin if you want to know the year. It looks older to me, probably a 90-91. Where is the "knocking" noise coming from on the engine? If it's in the head, then adjust your valves. Warriors are known for loud valve trains. If it's down low, then you may have some bigger issues...

 

[hammy7734]

if you could take a video so we can here it for our selves

 

[Matthewthompson]

either your valves need adjusted or it is normal. this motor does make a decent amount of "ticking" even when it is right

Never knocked like this before and had the valve checked and they were right

 

[bomber315]

then it something worse, its real hard to guess over the internet, more than likely crank or cam related. where is it coming from?

 

[Matthewthompson]

Check the vin if you want to know the year. It looks older to me, probably a 90-91. Where is the "knocking" noise coming from on the engine? If it's in the head, then adjust your valves. Warriors are known for loud valve trains. If it's down low, then you may have some bigger issues...

How do u tell by the vin I'm new to these, had it a while but not done much with it, Sounds more bottom end but not 100% think I'm just gonna go for engine rebuild to make sure all is right,

 

[Matthewthompson]

then it something worse, its real hard to guess over the internet, more than likely crank or cam related. where is it coming from?

Yes I know it's hard just wondering if there was a common problem or anything simple to check. Think bout just doing a full rebuild

 

[bomber315]

the starter clutches are a common problem, but they only make noise when you are cranking the engine over

 

[Warrior1996]

The tenth digit in the vin number is the year. Go to this website: http://www.atvstyle.com/atv-vin-number

If it sounds like bottom end, you're looking at rod/crank/crank bearing related issue. Your best bet is to split the cases and rebuild it if you don't know exactly what is causing the noise.

 

[Matthewthompson]

The tenth digit in the vin number is the year. Go to this website: http://www.atvstyle.com/atv-vin-number

If it sounds like bottom end, you're looking at rod/crank/crank bearing related issue. Your best bet is to split the cases and rebuild it if you don't know exactly what is causing the noise.

Thanks for that info will look tomorrow. Engine is out and ready to be split when I find time. Any good websites out there to get parts from?

 

[Warrior1996]

I get my parts from ebay and RockyMountainATVMC mostly.

 

[hammy7734]

i get mine from motosport.com


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[urable]

I am new to the quad life myself. I got a warrior and loved it. I am preping a frame to transfer everything over to a fresh painted frame. However, I was wondering if the knicking noise is normal for them. Wanted to see if it was before i transfered the frame that way i can touch up the engine before i swap it over to the new frame. Attaching video to the post.