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I have no compression on my 250 bear tracker what things would cause this

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timing may have jumped and bent the intake valve causing it to blow back into the carb on the compression stroke.

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then the timing is not set properly .

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Hi Ryan , the timing gear marks will possible not mark hundred percent when timing chain is worn much . the tensioner should be inside when you check the valve timing .

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Yamaha Timberwolf. How can I find model number to order parts


If you can tell me your vin - or your year I can tell you what model you have. But - if you go onto any parts site - such as cheapcycle.com or partsmonster - you name it - you won't need your 'model' # - just your year. You'd click - Yamaha OEM Parts, then ATV then Year - 1992 - 1998 was the Timberwolf - a lot of parts from the 99 - 04 Bear Tracker will work (just about only changed the plastics and carb in 99 - 04) same engine/transmission/rear end, etc. the brakes also went from drum to disc - but you'd click on the year - and then look - the timberwolf will be right there the 1992 - 1998 Yamaha Timberwolf 250 - I can't remember if they offered a timberwolf 350. If you can tell me the vin or year - like I said - I'll reply with your exact model # - but you can buy and order most parts just by model name and year 95 Timberwolf.

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1 Answer

Yamaha Timberwolf. How do I find model number to order parts?


I apologize - my answer to the previous question didn't really clarify your actual question - Your VIN can be found along the frame rail - left hand side - about a foot or so ahead of your left foot guard -

26028714-jbdqfs5232kzbw0rj532ox50-2-0.png

If it's still there - your model number is here:26028714-jbdqfs5232kzbw0rj532ox50-2-2.png

If you can read your VIN - and here's a tip to know you're getting the whole number and it's not rusted away a digit; your second digit should be a (Y) - if you write down your VIN, second digit is Y so you know the placement is right - the 10th digit is the year. And here are the breakdowns for that 10th Digit:

(For all Yamahas - not just the Timberwolf):
88 - J, 89 - K, 90 - L, 91 - M, 92 - N, 93 - P, 94 - R, 95 - S, 96 - T, 97 - V, 98 - W, 99 - X, 2000 - Y, 01 - 1, 02 - 2, 03 - 3

From 1992 - 1998 the Yamaha 250 4-stroke, shaft drive, trail bike was the Timberwolf.

From 1999 - 2004 the Yamaha 250 4-stroke, shaft drive, trail bike was the Bear Tracker.

*****SAME ENGINE, SAME TRANSMISSION, SAME REAR END, TIRE SIZE, PULL START - THINGS THEY DEFINITELY CHANGED IN 1999 WHEN THEY STARTED CALLING THEM THE BEAR TRACKER: - PLASTICS BECAME A LITTLE LONGER I BELIEVE; AND THE SEAT WITHOUT A DOUBT BECAME LONGER. THE CARB WENT TO A CONSTANT VACUUM - INSTEAD OF THE SLIDE CARB WHERE THE THROTTLE CABLE WENT THROUGH THE CAP LIKE THE TIMBERWOLF. HARD TO REMEMBER - BUT I THINK THE TIMING CHAIN TENSIONER BECAME UNADJUSTABLE - AND NOT MUCH ELSE CHANGED. IN 99 THEY EVEN KEPT THE BRAKING SYSTEM THE SAME. SOMETIME AROUND 2000, 01 OR SO THE BRAKE SYSTEM CHANGED FOR THE FRONT WHEN YAMAHA WENT TO DISC BRAKES. HOPE THIS HELPS. ANYTHING ELSE YOU NEED TO KNOW ABOUT YOUR TIMBERWOLF JUST LET ME KNOW - I'VE OWNED, REBUILT, BOUGHT, SOLD, TRADED A TON - I'VE CURRENTLY GOT A 99 BEAR TRACKER THAT IS THE MOST DEPENDABLE 250 4 STROKE I'VE EVER OWNED AND A 1996 YAMAHA WOLVERINE 350 4X4 - I'VE REBUILT THEM FROM THE BOTTOM TO THE TOP. THOSE BIKES ARE GOLDEN IF YOU TAKE CARE OF THEM AND DO A LITTLE ROUTINE MAINTENANCE. ALL THE BEST - JUSTIN MCCARTNEY

THE 99 I MENTIONED THAT I STILL HAVE:
26028714-jbdqfs5232kzbw0rj532ox50-2-5.jpg

A 98 I BOUGHT WITH THE ENGINE IN A MILK CRATE THAT I BOUGHT, REBUILT & SOLD:
26028714-jbdqfs5232kzbw0rj532ox50-2-9.png

A 2004 I BOUGHT, REBUILT AND SOLD:
26028714-jbdqfs5232kzbw0rj532ox50-2-14.jpg
All the best - let me know if you're ever in a jam with yours; not too much I haven't seen, fixed or had to deal with.

Dec 29, 2015 | ATVs

1 Answer

99 bear tracker


ok did you check for a good engine ground

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You seem to have many problems with this ATV reading the different postings have you checked the compression on all 4 cylinders if so what were the readings ?

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Low compression due to cam bearing issues


Pull oil sample from engine, send It to http://www.blackstone-labs.com/ and for $25.00 they will confirm or refute what the shop is telling you. Blackstone will also send you the testing kit for free!

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