If the crankshaft seal dries out, cracks, or breaks, it can cause an oil leak. You can usually hear hissing inside the crankcase if the seals are shot. The bike is a very old YZ50 with points ignition. The oil might have seeped through one of the bearing seals, too. MissSpentYouth MissSpentYouth TT Newbie; Members; 14 posts; Location: United Kingdom; Posted May 19, 2011. Would this be the best way to trouble shoot the situation? The same goes for engines that have a paper gasket between the head and cylinder. Gord404 Apr 10, 2018 A bad seal between the cover and case can allow the fluid to leak. Why would these seals need replacing? Knowledgable US Sales & Support. Your gear oil level goes down too since it is being burned up. I have been searching the this forum and found several post discussing the symptoms of a bad crank seal. Reed petals are situated inside a specially designed contraption known as the reed cage that attaches between the throttle body/carburetor and engine. The first thing to check before anything else is the mixture screws. So in short the crank bearings are shot (which I kind of knew) but I think it is the effect this is having on my ignition timing that is giving me the bogging at low and medium RPM problem rather than the seals. When an engine failure occurs, the piston is likely to take the brunt of the damage. I don't know if losing that much oil is normal or not. The last 2 times I replaced the tranny fluid I was about 100cc short. But the long and the short of it is that you should not be fooled into an unnecessary, and expensive center seal replacement. Worn Belts and Transmission Noise. That's why i was thinking "points on a YZ?"LOL! Service Location. I'm guessing the oil you added fowled the plugs?? Pull on the starter rope. Arnego is right the flywheel side seal is not in a bath of oil so it will wear quicker than the clutch side. I have a 2003 cr 125 i rebuild it and before then i fouled three … If you buy a 2-stroke dirt bike with a lot of hours or you ride a lot every month, chances are it will need the top-end replaced sooner rather than later. Symptoms include: over reving, overheating, stalling on acceleration, failure to idle, and worst of all, an engine seizure if the problem is neglected. Well to do this right classically requires a leak down test. I have adjusted the jetting to lean out the pilot, needle and main jet. Member. Hi, What are the symtoms of worn crank seals ? After removing a cylinder, chances are good that at least some of the base gasket material will be stuck to the crankcase and bottom of the cylinder, and it needs to be removed to ensure an airtight seal is achieved when the cylinder and case are reunited. Engines with reed valves that are failing can present symptoms of hesitation during acceleration. Once I am in there it seems like I should be able to remove the seal by drilling a hole in the old one, insert screw and pull out. The head gasket is inside this joint, and seals the cylinder head to the cylinder block. Sounds kinda suspicious to me. I believe it is bored out to 65cc if that makes a difference. To me it seems a little early for a 2007 to have a bad crank seal, or is it just my bad luck? If everything you checked is ok as you say it is, then you better focus on the crankshaft seals. while idleing, spray started fluid at behind clutch to see if rpm's jump up. Hi Guys thanks for all your responses. Copyright© ThumperTalk, Inc. - All rights reserved. By 2strokent94, January 11, 2009 in Honda 2 Stroke. The engine may fail to respond to the increased fuel flow and then jump forward as the gas is finally ignited. Member. Your idle will hang and/or the bike will rev erratic randomly. Misdiagnosis often causes unnecessary service costs and part replacement. How do bad crank seals (left or right side) affect a two stroke? Install the compression tester. This is because a spun rod bearing, i.e., a loose bearing that rotates independently of the connecting rod and the crankshaft, seals the oil holes on the crankshaft. I see this a lot on old and new bikes. Originally Posted by bitzz Lousy idle, screams at top end, plugs show lean after screaming at top end. Crank seals in two strokes can wear and start to leak, creating problems. BS Hall Of Fame Member; Posts: 3733; Near Green Bay Wi. It surges and you know. In today's video I finally tear into the snowmobile and find out why it was leaking oil everywhere. The bike does appear to smoke a little more than I would like and has a white appearance. Life span on the seal is related to many factors so 2 to 3 years of use would not be unreasonable for a life span. The oil might have seeped through one of the bearing seals, too. $0.00 . On 2 stroke dirt bikes, there is a rubber seal on either side of the crankshaft. You need to be a member in order to leave a comment. I believe this may be what I am dealing with. Facebook; Twitter; Youtube; Instagram; Newsletter; Sign in to follow this . You can make one with common components here is a link to the thread that explains it. Pull the starter rope a few times to get an accurate compression reading. Followers 0. signs of bad crank seal?? Is this the best technique? After the case is refilled with oil, adjust the chain to the manufacturer’s specification. Checking the condition of a 2 stroke dirt bike's LH crank bearing and crank seal is something that should be done occasionally and this is true whether riding motocross, off-road disciplines or FMX. However, I currently know that I have a leak somewhere at the power valve assembly, due to the oily residue coming from the py linkage cover. If the crank seal on the primary side fails you will get transmission oil coming into the bottom of the crank and get a smokey exhaust and a fairly distinct smell of burning tranny fluid. There is a gasket between the two cases, what is the chance that this will not get destroyed when removing the right side case? Normal compression is … 3) Tried squirting carb cleaner behind the stator plate but couldn't notice a change in Idle, couldn't really get at the seal. Joined Jun 17, 2003 Messages 21 Likes 0. MissSpentYouth, May 19, 2011 in Yamaha 2 Stroke. So the question is what are the symptoms of shot seals - guessing lack of power and running like a pig, guess it would also affect starting. The secondary in the background is more in focus than the center seal. Geeez,at first i thought you said '250'. For the engine mechanical I have 100 psi compression on the 3rd kick and 135-140 psi by the … When you install new seal be sure to lube inner lip of the seal with premix but do not lubricate the outer mating surface. A seal test is to do a pressure and vac test on each individual cylinder. would be very much appreciated. Copyright© ThumperTalk, Inc. - All rights reserved.ThumperTalk® is a registered trademark. Is the new seal easily pressed in. Does anything have to be done to the kick starter before disassembling the right side case? Symptoms of a Bad or Failing Crankshaft Seal If your car is reaching high mileage or is experiencing oil leaks, it may be time to replace the crankshaft seal. Thanks for the help AV8R. Turned the flywheel to get the points fully open and then tried moving the flywheel up and down as the crank bearing are badly worn and the points gap varied hugely. The seal on the magneto side (left side) prevents air from getting into the combustion chamber. Thanx . Thing is it idles and starts just fine but I dont seem to be able to set the ignition correctly I am having to retard it allot just to get some low end power if I set it to 1.8mm BTDC you just cant ride it as it completly bogs down at anything less than screaming. The end seals are rubber gland seals and actually wear on the crank. Install the compression tester where the spark plug would normally be. So best get myself some new crank bearings, seals and gasket set then. That is the most dangerous side. almon. the idle almost died out! I put in 750 and get out approximately 650. Neither will give the symptoms you describe unless oil is fouling the plug. Had a funny lower end knock.. I have an 07' yz 250 that I have been dealing with a rich running condition. Seals are ordered, engine parts are clean, pretty much ready to reassemble as soon as parts roll in, but I need to seal the mating surfaces of the crankcase and wonder what's the best stuff for doing that? Is it erratic idle, easy stalling, hard starting and poor low RPM power ? I believe this may be what I am dealing with. I usually don't ever see a problem with it other than the drooling making a mess. New seal is temporary fix 1 Share this post . If you develop a little tear try to fix it with a silcone sealer like Permatex ultra black. When you try to start your snowmobile and the engine cranks but won't start, or it turns over but won't start, you may have a bad fuel pump. You do follow Factory maintenance intervals don't you? If you feed in the throttle gently with incresing RPM it is better but if you crack open the throttle at low RPM you just start slowing down and it dies. That does not mean it was broken in properly, but at least if it was new I knew it was not going to grenade on the face of a triple. Over time these dry out. 3. Jun 20, 2003 #1. Two Stroke Piston Diagnosis The process of examining a used piston can tell a mechanic helpful information on the condition of an engine. - posted in Vintage Ski Doo's: I tried a test someone on this site posted to check for a bad crank seal. Crank Seals. Joined Aug 22, 2002 Messages 13 Likes 0. especially if you just crack the throttle open rather than feed it in, can that be attributed to worn crank seals ? A typical sign indicating you need to replace a two-stroke crank seal is an oiled plug or oil dripping from the exhaust pipe. Since 2 strokes have compression rings only and no oil in the crankcase, there's no use in talking about oil burning. Thank you, Seth . … Also I would wiggle on the flywhell if it moves the rollerbearings are shot which makes it impossible for the seals to seal. Obvisously, I have to remove the clutch basket, but will I also have to disassemble the water pump, kick start assembly and remove the next portion of the case? The transfer ports of this two-stroke engine are flowing equally and the color of the carbon pattern is chocolate brown. 2-Stroke Gasket Surfaces Prep. If a crank seal is leaking it can allow gearbox oil to enter the crankcase and causes the bike to run rich. A bad seal between the cover and case can allow the fluid to leak. As far as putting in a new top end that's up to you and the kind of riding you do. But if you pour 750cc's in a brand new motor, it's impossible to get exactly 750cc's back out through the drain plug. Link to post Share on other sites. In this post we’ll look at the top 5 signs and symptoms that your 2 stroke dirt bike may need a top-end rebuild. Welcome ... Well those are bad looking photos! Thanks Tom, thing is mine starts fine when hot and idles lovely which is why I am not sure it is the crank seals. Carefully examine this joint all the way around the engine. An often overlooked item on 2-stroke motorcycles is the crankshaft seal/s. 2 Stroke Design Spreadsheets, 2 Stroke Tuners Info A four stroke is leak down tested at 100psi and a 2 stroke at 6-10psi. Lose Power Going From Stop. Nothing needs to be done with the water pump it will remain intact . It does have worn crank bearings and as a result likely the seals are leaking. When you try to start your snowmobile and the engine cranks but won't start, or it turns over but won't start, you may have a bad fuel pump. 3. Sure it's not a DT motor? If it is the other seal going to the power valve assembly I believe it will affect the leak down test. Ok, hopefully I will be back on it this evening. Reed valves might be one of the most neglected parts on a two-stroke snowmobile. If the oil light on the car dashboard goes on, then this might indicate a problem with a rod bearing. If the leak is on the other end where it passes into the tranny area/govenor then it will not show up on the leak down test. Does the water pump have to be disassembled before removing the right side case? Pretty much anytime I'm under a load and wide open, the … So 100cc short on tranny fluid, for the last 2 times, is not necessarily a bad crank seal? i did my xlt it wasnt to bad, just a pain you have to take every thing out, but the good thing is that i found that my mag side was shot too. When it does, it'll run at full throttle but as soon as you close the throttle it dies. Replacing 2-stroke engine Crankshaft Seals An often overlooked item on 2-stroke motorcycles is the crankshaft seal/s. Excess oil leakage at the crank and rods can starve the valvetrain of needed pressure, resulting in a seemingly innocuous lifter tap that actually indicates worn crank or rod bearings. Like any mechanical component crankshaft seals have a limited service life and … I am bringing a 72ish GT380 back from the dead. If you install it too deep you risk starving the crank of oil. Just a quick video on how to change crank seal on snowmobile 2 stroke engines. Thanks for your response AV8R, your insite has always been helpful. I have adjusted the jetting to lean out the pilot, needle and main jet. Here are the symptoms: lots of oil in the casing (not bar oil, but nice blue 2 stroke oil) and dripping out of the casing, a general lack of power, erratic idling, and pretty hard to start after running for a while. The fuel air mixture screws on the side of the carburettor are marked H for High for the engines high speed adjustments and the L means Low for the engines low speed adjustments. while idleing, spray started fluid at behind clutch to see if rpm's jump up. I usually don't ever see a problem with it other than the drooling making a mess. I don't own a vacuum tester so I can't check it that way. I think your best option would be to start with a leak down test to confirm a leaky seal. You also might find the crank surface that rides on the I.D. Some oil is lost during normal operation more if you have a habit of laying it down. I rode my sled the other day and it ran great. Worn or broken rings will certainly cause reduce compression readings, but low compression often shows up as hard starting but not dying once it's running and especially after it's warmed up. I have been searching the this forum and found several post discussing the symptoms of a bad crank seal. In fact i saw it this week on a 09 CRF 450.
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