Well, after a looong absence, I took the second half of today and really dug into my '81 Heritage Special donor bike. The last time we chatted about this bike, I had gotten the BS34 carbs back from our local carburetor wizard - Bruce - and after installing them, the bike started and ran really quite well. She has a couple of other problems (front brake may be wonky and there are some electrical gremlins) but the major issue at this point really is that the starter make that delightful "teaspoon down the garburator" sound that we all know and love about our XS650s.
The problem is that I have a bad right knee from an injury I suffered as a 13 year old kid, and so my days of riding a kick-start-only-bike....are over. Thus, I really cannot to do too much more on this bike until I can get it started reliably - "on the button". So, in my usual uptight, engineer fashion, I have been researching the famous 4th starter gear hairpin repair and assembling parts, tools and equipment to do the job. This dumb little component has kept me up late for weeks as I prepared to fix it.
The hairpin lives inside the RH engine case cover and is hidden behind the clutch.
The actual hairpin (clip?) is mounted on one of the starter gears and that assembly looks like this:
The difficulty with the hairpin - clip occurs if it is too loose on the gear which causes the starter to fail to engage properly. There is a lot of info on the clip, on squeezing it in a vise so that it grips the gear more positively and so I won't go into that. My purpose in this post is to describe the initial steps of actually getting access to the hairpin clip so that I can squeeze it, or change it. The damn thing is bad - and CHoHW - I am going to deal with it. I also wanted to point out the pitfalls in this task that I have found - so far - so hopefully, the next person to do this very common repair will benefit from my experience.
First, I removed the fuel tank and laid the bike down on her left side with an axle stand (suitably padded of course) under the LH exhaust header pipe. This gets the bike over far enough that I don't need to drain the oil, but more importantly, it places the clutch and attendant components at the ideal height and orientation for me to work on them.
I then removed the foot peg ass'y, the kickstarter lever and the rear brake lever from the bike. After disconnecting the tach drive cable, off came the many (is it 10 or 11?) socket head capscrews (aka Allen head bolts) that secure the right-hand side engine case-cover (aka clutch cover). Then I removed the cover itself. It came off very easily (no mallet tapping required) - BUT - there is a major gotcha in this step:
LESSON 1 You must push the kick start shaft IN - as you remove the RH engine case cover.
If you don't push the kick start shaft in - the whole kick start mechanism can come away with the engine case cover - and that is a major PITA when you go to reassemble the engine. Once you've got the case cover off - set it aside and drape it with a clean cloth to keep the nasties out.
NOTE: don't bother to remove the oil strainer and its little round cover - they come off with the engine case-cover. The oil pump comes off and stays in the case cover. Also, after you get the engine case cover off, you need to clean ALL remnants of the gasket off the case and the engine itself to ensure a clean smooth surface for the new gasket.
At this point, I was facing this:
Let's take a really close look at those side clutch-pack securing screws. Note how the 11:00, 3:00 and 5:00 o'clock screws are pretty badly...well, screwed. Somebody has been in there before, and whoever it was didn't use good tools on those big JIS clutch fasteners. All I could think was "
holy crap - how the he!! am I going to get these friggin' screws out?"
But wait! I remembered that in my enduring quest to acquire every single tool ever made, I had bought a #3 JIS
impact driver - the IMPACTA.
So, I set that big bad boy #3 into (
what was left of) the head of the 3:00 screw - which was the worst one. I pre-loaded the driver by turning it counter-clockwise in the screw head, and gave it a mighty swat with my mallet. It loosened about 1/8 of a turn on the first hit. VICTORY!!! After a couple of good hits, each of the other five screws were loose and I turned them out 1/2 turn at a time in a cris-cross sequence and in a few minutes, I had the clutch inner-member off. Needless to say, I have already a set of XS Performance socket head clutch screws for the re-install. Those dumb and damaged JIS clutch screws are going into the can - for sure.
LESSON 2 - everyone should have one of those grey Vessel brand #3 JIS impact drivers. I ordered mine on Amazon, you can get yours there too, or from your Aunt Mary's utensil drawer or from Santa Claus - but get one.
IMPACTA - YEAH BABY!
At this point, I figured that I had this whole job on the run - but I didn't. My bike still had another gotcha in store for me - and this one IS truly puzzling. I had checked very carefully and found that the clutch assembly is secured by a big 27mm nut - and so I had bought a 27mm socket and a clutch holding tool just for this job.
Imagine my surprise when I found that my shiny new 27mm socket would NOT fit on the nut. How....odd.
I whipped out the ole' digital vernier caliper and measured that big nut - and it is a solid
29mm across the flats. This is very surprising and quite puzzling. Anyhow, I went out to Princess Auto and bought myself a few more BIG metric sockets. I am now the proud ovwner of 27, 28, 29, 30, 32, 33 and 34 mm sockets.
C'mon big metrics - I'm ready for ya!!!
LESSON #3. Never assume you have enough tools - there are always more tools that YOU need and you must seek opportunities to buy them.
OK, it's late and Lucille and I are going to cover about 450 km tomorrow so - stand-by for chapter 2 of the saga of the starter hairpin repair.
Cheers,
Pete