Dazzler Posted May 15, 2017 Posted May 15, 2017 Hey, Picked up an 88 750 last week. Hasn't been used for ten years apparently and has been sitting in a shed. Nooks and crannies full of spider webs and nests so it's definitely been sitting unused for some time. Paint is actually a real good job. So was wondering if it has a genuine yosh system on it or is it a home job? Quote
Dazzler Posted May 16, 2017 Author Posted May 16, 2017 Thanks Fazz. Got exhaust off last night, thought it would be major drama but no real issues. Lots of surface rust on headers but no holes. Tank had some muddy liquid in it which turned out to be acetone. Inside of tank is not too bad apart from some giant flakes of rust that was floating around in the acetone. Have to get em out sommehow. Anyone have suggestions on attempting to get rust off headers? Electrolysis...acid bath? Quote
Captain Chaos Posted May 16, 2017 Posted May 16, 2017 Hi and welcome. That exhaust looks a lot like the Yoshi I had on my '88 750. But mine had the duplex system. Quote
Swiss Toni Posted May 16, 2017 Posted May 16, 2017 (edited) Welcome! Electrolysis for the pipes. Phosphoric Acid ( Pool Cleaner) mixed 4-1 with water for the tank. Failing that, White Vinegar. You could also mix a tin of Black Treacle (Molasses) to a bucket of boiling water, and sling that in! Don't do the usual 'handful of nuts' to loosen rust from the tank insides, instead use a length of chain (not a bike chain), far easier to fish out than nuts! Edited May 16, 2017 by Swiss Toni 1 Quote
Dazzler Posted May 16, 2017 Author Posted May 16, 2017 7 hours ago, Captain Chaos said: Hi and welcome. That exhaust looks a lot like the Yoshi I had on my '88 750. But mine had the duplex system. First thing I looked for when I picked it up was the duplex header. Still looks like all other Yosh type headers I can see with a google search. End can I am not so sure of... 2 hours ago, Swiss Toni said: Welcome! Electrolysis for the pipes. Phosphoric Acid ( Pool Cleaner) mixed 4-1 with water for the tank. Failing that, White Vinegar. You could also mix a tin of Black Treacle (Molasses) to a bucket of boiling water, and sling that in! Don't do the usual 'handful of nuts' to loosen rust from the tank insides, instead use a length of chain (not a bike chain), far easier to fish out than nuts! Electrolysis is my first choice to try remove rust from exhaust. Tank is quite good but might try some kind of light acid bath to get more off, cap has no lock so will need to seal it somehow so I can flip it upside down. Quote
Swiss Toni Posted May 16, 2017 Posted May 16, 2017 (edited) Blanking plate for petrol tap opening, and brim tank right up with whatever concoction you choose to use. Edited May 16, 2017 by Swiss Toni Quote
SiBag Posted May 17, 2017 Posted May 17, 2017 Nice looking start. Not looking at all bad for sitting for the past 10 years. Oh, and welcome.... Quote
Jaydee Posted May 17, 2017 Posted May 17, 2017 On 5/16/2017 at 1:34 PM, Dazzler said: First thing I looked for when I picked it up was the duplex header. Looks like Yoshi Cyclone downpipes to me, not Duplex. Quote
Dazzler Posted May 17, 2017 Author Posted May 17, 2017 Brilliiant! Thanks Jaydee. After a lot of wrestling i managed to get the carbs off last night. Getting the throttle cable off was the hardest part, there must be some trick to it... Quote
Captain Chaos Posted May 18, 2017 Posted May 18, 2017 disconnect the throttle cable at the handlebars and remove the carbs complete with the cable. For putting the carbs back in, remove the battery and batterybox and air filter so you can push the airbox-carb rubbers on from the inside. A bit more work but much easier. Quote
Dazzler Posted May 18, 2017 Author Posted May 18, 2017 Ah, at the bars...I got carbs out no probs by removing boots into airbox, getting that throttle cable off tho... Couldn't get airbox out either, alternator is in the way. Does a heat shield plus side covers = an airbox (or closely) I am assuming you would still want to run with some kind of filters on carbs. Does a heat shield really help? Summer can get pretty hot here and I remember my L model being a bit rough in the heat. Quote
Oilyspanner Posted May 18, 2017 Posted May 18, 2017 Smart looking bike Dazzler, those exhausts are pretty rare now too ! The standard airbox can supply over 150hp worth of air with the right filter in it (feeding 90-100hp isn't going to be a problem), the short stroke motors like the a.box and it shields a lot of the heat from the engine entering the filter - the cool air duct from the front helps too. The rubbers from the carbs to a.box act as velocity stacks too . . . the standard set-up with jet kit and filter will net the best overall power - it just seems a bit boring, it works well though ! Quote
Dazzler Posted May 18, 2017 Author Posted May 18, 2017 Thanks for info everyone, much appreciated Quote
Upshotknothole Posted May 18, 2017 Posted May 18, 2017 I've still got a couple old Yosh 750 headers that look exactly like that one, with at least the same amount of rust. The can might be from a later system, but that header looks like a Yosh to me. It's been too long since I've seen a V&H to remember what they look like. Quote
Dazzler Posted May 22, 2017 Author Posted May 22, 2017 Is this a stock needle? (A well worn one) Going to get carb kits to replace o-rings etc and these needles. Quote
Dazzler Posted May 22, 2017 Author Posted May 22, 2017 Looks like main jet has a star on it and they are 100 Quote
Upshotknothole Posted May 22, 2017 Posted May 22, 2017 Check the emulsion tubes too. If the needles are extremely worn, the tubes are usually shot too. In the states, if the needle height is adjustable, it's aftermarket, not sure about the UK. Quote
Dazzler Posted May 25, 2017 Author Posted May 25, 2017 So looks like it doesn't have standard jet sizing or needles in it. I guess you would expect that with yosh exhaust on it. Also think rotor pickup is not standard. Doesn't have Denso on it, only three dots for tdc. Will hopefully get out for a look tonight...if i get home from work at a decent hour Quote
Dazzler Posted May 29, 2017 Author Posted May 29, 2017 Can barely make out 5FZ89 on needles but according to parts site they are stock for Aust. Anyway have ordered a bunch of carb parts, fuel lines and other bits. Hopefully have them later this week. Quote
Dazzler Posted May 31, 2017 Author Posted May 31, 2017 Standard needle for Aust. After lots of poking around, only thing not standard in carbs is main jet @100 Quote
Antman Posted May 31, 2017 Posted May 31, 2017 Hi Mate Those needles are right, I have 4 new I could of sold you for half the price of what you paid. Are you in Oz? Going by the pictures looks like Cairns? Ant Quote
Dazzler Posted May 31, 2017 Author Posted May 31, 2017 Yeah i am in Melbourne...not too close to Cairns lol. The needles are $11 ea new so not too bad. Was expecting to pay more tbh. Ordered all new o-rings too and fuel lines. Front brakes still feel solid but kinda thinking of replacing with braided, will have to get new discs most likely too. Quote
Antman Posted June 1, 2017 Posted June 1, 2017 Use Mick Hone for Oem parts they are in Melbourne. Carb O -rings are all available through most bearing shops. Quote
Dazzler Posted June 2, 2017 Author Posted June 2, 2017 I used to live near Mick Hone and thought they closed down not long ago. I used Western Motorcycles in Penrith for the online order. Great service from spares team and had parts in my hand a few days later. Bit cheaper than others too. On a side note... Big fan of black and red colour schemes. Found this pic and am considering aiming for something resembling this. 2 Quote
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