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YPVS TONE

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Posts posted by YPVS TONE

  1. Usually if you get a faulty rectifier / regulator you will get a lot lower voltage then you have so i would check the connections and make sure they are clean and tight. You can test the stator coils in the generator by disconnecting the block connector with the three white wires coming from the engine and checking the resistances across the wires i.e three tests they should be within 0.44 - 0.66 ohms . If this checks out the manual then just says replace rectifier /regulator .Tony.

  2. Looking at the picture am i right in saying that you still have the drum connected to the cables if so then you will find if you remove the cables the shoes will fit flush against the operating cam.The gap is where the cables have taken up the freeplay in the shoes / drum and is normal.When removing the shoes leave the springs connected and pull the shoes up in a V shape doing the same in reverse when refitting. When refitting clean the shoes and put a LIGHT smear of copperslip on the pivots and operating cam where the shoes fit. Tony.

  3. Did you adjust the camchain with the engine in the correct position ? If you take off the LH side crank cover you will see a C mark on the ignition rotor which you line up with the line on the upper pickup coil turning the crank in the direction of rotation i.e anticlockwise using the square on the end of the ignition rotor not the allen bolt.Then loosen the locknut on the camchain tensoner and then the bolt. This releases the spring loaded tensioner rod and takes up any slack in the camchain.Retighten the tensioner bolt to 8Nm and the locknut to 9Nm. Hope this helps. Tony.

  4. I had the same problem on my Rd350 powervalve tank and came across a product available from tank care products tel : 07834415921 mon to fri that is used to line aircraft fuel tanks.It comes as a one part red sealer that you pour in to the tank and swill round to coat the inner surface. It does take a few days to set but once set will remain flexible and fuel resistant.You will have to make sure the inside of the tank is totally clean and degreased ( i used brake cleaner ) and dry also if someone has used petseal on the inside this will have to be removed first.I wouldn't use petseal as this tends to break up after a while and block carb jets. Tony.

  5. If your having trouble starting after not being started for a week or two try turning the petrol tap to the prime position to fill the carbs for a few seconds then back to the on position this saves the battery while the carbs fill up. I have this on my RD350 powervalve if left for a few weeks the fuel seems to evaporate from the carbs so now i turn to the prime position for a few seconds then back to the on poition and it usually starts second or third kick. Tony.

  6. Hello to anyone checking this question out.

    I am a confirmed coffin dodger still mucking about with 2 strokes. (cant be bothered with valves and chains etc)

    but I have always had #uzu#is up to now,apart from when I was a youngster.

    Anyway my son has a rd 125 lc which I put him onto so now he has the 2 stroke illness,and a few days ago he kindly filled my empty shed with a yamaha which he came across on a rundown farm building.

    The engine size is stated as 195cc and it has a drum front brake,its a big old beast for the engine size and its a new one on me.Have no v5 yet just a key engine no say's #3L2-000472# Cant read frame no at minute.It also has a single carb although its a 2 stroke twin,its in pretty poor nick so need to find out if its worth the winter resto or not?

    It also has what look like usd forks,I am wondering if its an import as its on a x reg 1981/82 .

    I would be extremely gratefull if anyone can point me in the right direction with this bike,and would anyone know where to check the registration Number for info.. i.e internet site..

    Many thanks and a smokey new year to all oil burners.

    The 3L2 prefix is a Yamaha RS200 and an X reg would be about right if this is in UK. They were basically a commuter bike with the engine based on the RD200 but with a single carb as you say and drum brakes front and rear where the RD200 had a disc front and drum rear. They were an official UK bike and not an import.Hope this helps . Tony.

  7. If the tap is the same as a UK spec XJ650 what you have is a main fuel pipe which as you say goes to the carbs but the other smaller pipe is actually a vacum pipe which runs from the tap and goes to a stub on one of the inlet manifolds between the carbs and cylinder head,which i think is N03 cylinder counting from the left as you sit on the bike.If you look at the tap you should have 3 positons marked on it i.e ON,RESERVE and PRIME.The idea is under normal running you leave the tap in the ON position so when the engine is running it creates a vacum in the tap which opens the diaphragm in the tap which then lets fuel to flow.The prime positon bypasses the vacum side and lets fuel flow out without the engine running so you can fill the carbs when they are empty.The reserve position should only be used when you run out of fuel in the ON position but should be turned back to ON when you fill up the tank again.The other inlet stubs i.e 1,2 and 4 should have a black blanking cap fitted to them as these are only removed when you are balancing the carbs with vacum gauges. Hope this is some help. Tony.

  8. Hi Morgy

    Just noticed in the manual they also list a fuel level of 6 to 7mm checked by connecting a piece of clear tube to the float bowl drain and undoing the float bowl drain screw with the fuel tap on and holding the tube next to the carb. The distance is measured from the horizontal line of the carb / floatbowl join to 6 to 7mm below the line with the bike level and upright. This is probably easier to check then having to take the carb off to check float height.Hope this helps.Tony.

  9. HI Morgy

    The float height for the 05 YBR125 is 21.8mm measured from the float bowl gasket face (i.e gasket removed} to the bottom of the float. Also when checking make sure the tang of the float just touches the needle valve and doesn,t compress the spring inside the valve. Hope this helps. Tony.

  10. HI

    I also have an 83 LC2 fitted with a steering damper. I managed to get a damper from MandP,a Kawaski type as there still made but the brackets i got from Mead Speed as they had a set kicking about. If you look on ebay and search "YPVS DAMPER" there is a set with a few days to go but it will probably go for quite a bit. MandP do a universal fork clamp for the 35mm forks but when i tried to fit it i couldn't get it to fit behind the headlamp/fairing bracket just to let you know. Tone.

  11. XT550 ( 5Y3 ) Prefix

    Spark plug NGK DR7ES Gap 0.6 - 0.7mm i.e 24 - 28 thou

    Valve clearance Inlet 0.05 - 0.10mm ( 2 - 4 thou ) Exhaust 0.12 - 0.17 ( 5 - 7 thou )

    Air filter i think is a foam type which you can wash out and lightly reoil

    Hope this helps Tony

  12. If i remember rightly the SR and XT125 had a oil level sight glass in the right hand crankcase cover at the rear which has an upper and lower level mark which you check with the bike standing upright. If you don't have one and you have a dipstick you are right in saying that you unscrew the dipstick wipe the oil off and rest the dipstick on the threads i.e. do Not screw it in at all again making sure the bike is standing upright i.e Not on the sidestand .Hope this helps. Tony.

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