The story so far.

[number33]

Bonez, I had a brandnew 79750K eventually with 4-1 and tweaks, made it like an F. I remember it as a smooth motor with a good kick at high revs. Good to see you know your bike inside out too.

[Bonez]

Bonez, I had a brandnew 79750K eventually with 4-1 and tweaks, made it like an F. I remember it as a smooth motor with a good kick at high revs. Good to see you know your bike inside out too.

Cool. Saw a nice dohc 750k, along with a few 900Fs and a sohc k about a month back at the Patangata bub. All were in good nick.

[bohdan]

Hi Bonez,
Nice to see someone else with an interest in these bikes. Here's my old girl down in Dunners - its actually a 900 in a 750 frame.

Have rebuilt the top end with a Wiseco 985 kit, also has Dyna2000 ignition & coils and also a rather tasty set of 33mm CR specials. It's a whole lot of fun for a 25 year old bike.

I'm also bohdan on the CB1100f.net site, I think I've seen some posts by you over there..? Cheers.

[Bonez]

Hi Bonez,
Nice to see someone else with an interest in these bikes. Here's my old girl down in Dunners - its actually a 900 in a 750 frame.

Have rebuilt the top end with a Wiseco 985 kit, also has Dyna2000 ignition & coils and also a rather tasty set of 33mm CR specials. It's a whole lot of fun for a 25 year old bike.

I'm also bohdan on the CB1100f.net site, I think I've seen some posts by you over there..? Cheers.

Excellent. Yip same nick over there. Would'nt mind getting a US spec top 39mm triple clamp to use tubular handle bars though.

Kids have moved back out, so Gerty's sister may get some attention-more room in the workshop YAH!!. Like the fact you aren't paying an arm and a leg for tires etc.

Welcome to KB.

[bohdan]

Would'nt mind getting a US spec top 39mm triple clamp to use tubular handle bars though.

Sounds good - they don't do it for me but different strokes eh? Personally I'd kill for a set of 1100 cams for my 985 but they're extremely hard to find even in the US.

I don't know if you've been on cb1100f.net recently, but if not you may not know that member matt@psb died in a car vs bike last weekend. Very sad.

[Kickaha]

Sounds good - they don't do it for me but different strokes eh? Personally I'd kill for a set of 1100 cams for my 985 but they're extremely hard to find even in the US.

If you can get the specs for the cams,why not just get some ground?


ever thought of Pre82 racing?

[bohdan]

If you can get the specs for the cams,why not just get some ground? ever thought of Pre82 racing?

Just one of those things - if I happen to see any on ebay I might buy them but content to wait. They require a bit of clearance work on the head to make them fit so it's not a straight-forward swap.

Pre-82 racing? Probably not its just a bit of fun for me both on the bike and mechanically
Cheers.

[Bonez]

Tossed 1 inch spacers in the each of the fork legs today. An old cb250t rear wheel spacer, which a mate cut in half on his lathe. Should jack the ol girl up a bit when the air leaks out of the forks.

[Bonez]

F'n glorious ride back from the folks place this morning. Leaving at around 8:00am. Discovered some awsome back country "lanes", with a pinch of gravel thrown in. Basicly one of those "I wonder were that road goes" kind of rides.

Time again for a blood transfusion. So off I pop to Super Cheap Autos for 4ltrs of their finest (read cheap) oil for Gerty. Opted for Valvoline this time as Mitre 10 doesn't stock Duchams any more, pity. Adjusted both cam chains while I was in a generous mood. The oil and filter were a smidgeon darker than usual [mentle note to self- after 20 years of ownership I STILL haven't started a servicing log] Oh well, will record here the next change is due around 130,000 to 131,000km mark. Will maybe even check valve clearances around the same time. She'll be due for a replacement final drive chain about then too I might add. Got a BT45 that I'll throw on the spare front wheel shortly also. It's nice having a few spare bits n peices floating about.

Just out of interest max recommened psi on the forks is around 14psi. I'm finding 20psi seems more suitable when the pace gets up a bit.

Oh and just topped up the battery and placed on trickle charge for a couple of hours.

Edit-Had new tire fitted to spare wheel will fit mid October looking at the condition of the ME33 currently fitted.

[Bonez]

The old dears electrical system is playing up. Found one of the yellow wires from the alternator had chaffed on the exhaust heat sheild mounting bolt. Tested windings, reg/rectifier and replaced the carbon brushes. Compared readings with known good items too. Still no luck. Seems to be charging but not as much as it should. Battery recharged and in good nick. As soon as any thing light related goes on, idicators, park/main beam the voltage just plummets. Not surprising but certanly more than previously. Noticed some of the laquer had come off some windings, probably due more to old age /vibration by the looks, but no shorts at all. I'll relaquer them.

I'm in the process of inspecting the wiring for chaffing. Am I on the right track?
If I haven't got it sorted in a fortnight, no hurry, it's off to someone with a clue

[Bonez]

Popped the old girl into the local Honda shop last week. Seems the alternator is doing it's thing. Suspected the reg/rect, they got a replacement one. Still no go. Could be a wiring fault of some sort as I suspected. Suggested I take it into an auto electrition. It's nice to have a second opion. Decided to wait till after the xmas humbug. Quite freindly folk.

May swap out the loom of the spares bike in the meantime, not a hard job. As you can see I'm in no hurry or panic. Have a few other scoots to keep mobile on. Quite enjoyed tinkering. Even gave her a bit of a clean before she went to the shop.

Hope you all have a good day tomorrow. Might see some of you at Wangas on boxing day.

[bohdan]

Allegedly the rotor windings can go partially open circuit - I say partially because supposedly the failure mode is that when resting you measure them and all is fine, but with a bit of centrifugal force (x000 rpm) they go open circuit and your charging system takes a nose dive. One of those bitch faults to find as the fault actually disappears during the time that you can do the faultfinding.

If you've got another rotor lying around, swap it out and try it. If you don't have the right tool for the rotor removal (who does?) remember that the rear axle bolt works beautifully (I've done it - it works great).

[Bonez]

Allegedly the rotor windings can go partially open circuit - I say partially because supposedly the failure mode is that when resting you measure them and all is fine, but with a bit of centrifugal force (x000 rpm) they go open circuit and your charging system takes a nose dive. One of those bitch faults to find as the fault actually disappears during the time that you can do the faultfinding.

If you've got another rotor lying around, swap it out and try it. If you don't have the right tool for the rotor removal (who does?) remember that the rear axle bolt works beautifully (I've done it - it works great).

Thanks for the advice. Yip changed windings. Used a rear axle of a cb500 I scrapped years ago to remove/replace the rotor (have a spare one of those too and ret/reg). Works great alright. Just tighten it up a bit then a swift clout with a club hammer did the trick.

I see replacement permanent magnet alternator assy, complete with suitable reg/rect, are available from Japan. As well as some other ideas to consider.

Edit- Off to the auto electrician she goes.

[Bonez]

Turns out there were a couple of broken wires around the steering head area. Thanks New Era Auto Electrix, especially Mike.

Tossed a BT45 on the manky spare front wheel and fitted it. Never tried one before. Noted front disk pads are getting low so will fit the set the came with the spares bike.

Edit- May have gotten my hopes up a bit to soon regarding the charging system. Was fine for 250kms now back to it's previous trait. Found some good info here- http://home.earthlink.net/~trinomial/DOHCcharge.html

[sarahtvet]

Found some good info here- http://home.earthlink.net/~trinomial/DOHCcharge.html

Well have to admit, lots went totally over my head but I know where to come if SK1PY needs any TLC I think!!! Would love to come over and meet Gertie in the metal sometime.

Certainly fun bikes to ride and I loved the dichotomy of swapping between the Daytona and the Honda on saturday. Felt a very priviledged girlie

Made me really appreciate their different traits

Brother suggested that a small fairing around the headlight would be good, would respect your advice on that sometime. Also will need a new headlight too as this is a sealed unit, so any suggestions?

Found the compartment for the tool kit too but no tools so what size spanners etc would you reccomend?

Will have loads more questions I am sure. Can't wait to ride legally