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    Which way up/fitted does this worm drive gear go please.

    Im an idiot - I didnt take enough notice. Its the worm gear thats driven by the oil pump and sits on the same shaft - does the recess point up or down. Its fits either way and drives the tacho in the same direction as well. The nut has better purchase if its fitted with the recess up. Next time...
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    Is my Oil Pump serviceable - Advice please

    I am building a spare motor and cant decide/confused if the oil pump is serviceable. Inner to outer rotor clearance - 3.5 thou. (some specs on the forum - no specs in my 77 D Yamaha manual). Side clearance (straight edge across housing, feeler guage between straight edge and top of rotors) - 3...
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    Stand broke - Honda dropped

    I have a 2018 Honda CB1000R which has a single sided swingarm. I had a machinist make me an improved pin for the Single Sided Swingarm Stand which he suggested he would use 6000 (??) Aluminium. This worked well for 2 years but sheared through the other day which dropped the bike and caused small...
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    Rewound Rotor 4.70 Ohms - is this good enough

    I have got my undies in a twist over this spec. My Yamaha workshop manual (74-77) has a specification table in the front which says rotor resistance 5.15 +- 10% which equates to a low of 4.63. This is the spec that I sent to the guy who rewound my rotor. It looks like a good job and cost was ok...
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    Friendly Dissagreement about Mixture Screws

    Im having a friendly dissagreement/discussion about the way the mixture screw works on our BS38 Carbs. My friend says the early BS38's (he means up to TX) have a mixture screw that richens the mixture when you turn it out, and on later models (my 77D) it works the opposite i.e. it leans the...
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    Understanding oil flow in head/rocker area - how does it work ?

    I do not understand where the oil goes and the associated parts fit in, in the head and rocker box area. I have had a good look (including my Yam Workshop Manual and Hans book) but am confused, especially the purpose of the 4 sleeves in the outboard head stud holes. I understand the oil enters...
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    How to measure/assess play in small end of connecting rod.

    I am rebuilding a motor and want to know if the gudgeon pin to small end clearance/play is okay. Ive had a good look around the forum/internet and found bits and pieces. My manual (74-77 Yamaha) doesnt say anything about this specs. The best I have so far is rock the pin up and down by grasping...
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    Transmission Photos in Shift Order - maybe handy for somebody.

    This is the positioning of the transmission gears in order from Nuetral to 5th. The motor is turned upside down, the gears are in the top half of the motor and I am standing at the rear of the motor. Hoping it may be handy for somebody. Regards - Ray.
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    Bolts for mounting Starter Motor.

    I recently purchased a second hand starter motor without mounting bolts. One hole appears slightly larger than the other 3. Parts diagrams show 2 different part numbers for the 4 bolts. It appears 2 of the bolts have no thread on the upper part of the bolts. Are they a special shouldered bolt...
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    Gearbox Inspection - Opinions Please

    447 - 3GO I am slowly rebuilding a motor whose history is completely unknown. I have never seen a gearbox in the flesh and I dont know what i'm looking for - serviceable or not. The photos show so much detail that I'm having to seperate original machining marks from likely wear marks. I am not...
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    Later 6 plate clutch - Spring plate orientation

    I've made a rookie mistake. I took a late 6 plate clutch apart and didnt take any notice which way the spring plate goes. I have attached a picture of the plate in question - its the one under the steel plate that is retained by the wire - Part number 7 in the picture. It is "dished" so that it...
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    Clutch Spring Length confusion - some bits sorted

    I need to buy clutch springs for my 77D. (Standard 7 plate - short springs) Researching the forum was a bit confusing (to me) and whats available is also a bit confusing - looking for some clarification. Mikes sells 2 kits for the 650 : Part number 39-6506 - I have a set of these on hand and...
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    Model Planes

    I was cleaning out some stuff and came accross the boxes my model planes came in and before thowing them out I took some snaps. The last photo is the finished articles and unfortunately it doesnt show the work involved in building these. For example the correct colours for the hydraulic lines...
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    Having trouble with Master Cylinder - how to test.

    I recently fitted a 14mm front Master Cylinder I purchased from Mikes. Its for the twin discs on my 77D. It worked okay for a couple of weeks (bled real easy) even though to my surprise it didnt feel much better than the original (still wooden). The other day the lever sunk all the way to the...
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    Installing A Tri-Spark Ignition System

    FITTING A TRI-SPARK TO YAMAHA XS650 I recently fitted a Tri-spark electronic ignition to my Yamaha XS650D. I purchased the unit from Steve at Tri-Spark who lives in the same city as me. Disclaimer – I paid full retail price for it and advised Steve at Tri-Spark that I will do a “install and...
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    Choosing a rectifier

    Bike - 77650D. I have posted 2 links to Windy Nations rectifiers on Ebay. Even though I have saved lots of favourites on all sort Electrical, I'm still a bit confused on which rectifier to buy. I just want a spare so that I can always keep my OEM Alternator going as the forum has taught me that...
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    Hughs Handbuilt After Sales Service

    I think its important that the forum knows when a business, that supports our Yamaha XS650's, gives exceptional and unselfish after sales service. Regards Ray.
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    Buying rivetter tool for cam chain

    Getting prepared for a top end rebuild and need to buy a chain breaker/rivetter tool. I dont want to buy a cheap one that will break/bend but one that will do a home mechanic - may not get used again but its nice to have the tool handy in case. I dont intend to use it for breaking the chain...
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    On Holidays - went on a shopping spree for bike stuff

    Things get a bit slow at night, so I went on an online shopping spree. 8 litres of Castrol semi syn 10/40 - 60% off - $100. Vesrah Gasket set - as per the advise of this forum - $146. Bush/bearing driver set - cheap quality - could be handy - maybe not any better than using sockets - $76. Decal...
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    How to test Shock Absorbers and where to get mounting rubbers.

    If possible I want to keep my original shocks on my 77D, because they are the original look and I wont be using the bike for any competition type riding. If I remove the spring, what test do I do to know they are seviceable (hydraulically speaking) before I spend money on chroming and a bit on...
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