Saving Old Seagulls

Hi Jeremy, I will be looking into the gearboxes such as featherweight, 40 and century.I have not had much to do with other models. Hoping to keep any fix ideas cheap cos I don't like spending money. Have been banding a couple of ideas around with CharlesUK and hopefully come up with something fairly...

Sorry for the short answer, sure it'd be 1/2 inch but recken could take it out to sleeve the pinion shaft. This way could bring any worn bearings/ shaft back up to tolerance. This in itself coupled with cutting a few oil seal recesses would be a fairly quick job. Seals should last longer with a suit...

No idea.

Consulted Mr Pythagoras and you are absolutely right, but in checking the answer is simple to this problem. Will try it on my spare box and let you know.

Failing that just throw a stainless sleeve on the oil seal area of the pinion shaft which is a two minute job and wouldn't detract from the strength of the shaft will so little hp going through it.

Fair comment. Although where there is a will there is a way. If it only comes down to this being the only obstacle I'm sure it can be overcome. Leave it with me and will get the grey matter working. As a biker also I discovered that soaking fasteners and ferrous metals in fully synth meant that they...

Just pulled a 40 box down and would be more than feasible to put a seal at the top and behind the prop. Smallest rotary seal I can find at quick notice is 18mm OD and only 3mm deep. The 40 box would more than accomodate this both top and bottom seals with very little engineering. Can't speak for oth...

Ok Charles, quick question as I don't have one to hand. How is the drive shaft held in the bush at the top of the gearbox? Is it assembled and the drive gear pressed on? Can't make out from available schematics as to how the shaft and bush assembly fit and stay together. Is there a roll pin/collet a...

Fling covers this much in the same way the bores of an ICE. It appears in the boxes I have been into that there is a cut out in the cap to supply the rear bush and the front supplied from the driving gear fling. All I was indicating was that the oil would be less critical than some put heed to. As l...

Realistically the teeth on the gearbox wheels only need the finest coating of g/box oil to prevent wear. If you set up can provide this all is well. Whether emulsified or not this is the only requirement. I once built a trike using a bevel box in the final drive train. The bevel box had less oil the...

Not saying I could come up with it for the average seagull user but sure it can be done. I am fortunate enough to have a lathe, miller etc so if it could be done cost effectively I would be happy to do it for others. If anyone has any shot gearboxes for the cause I'd be more than happy to address th...

Just a thought but is there no way of sealing the gearbox? Gearboxes on any other vehicle ordinarily don't run on a water/oil emulsion. As there are only two places that water can actually enter the box it can't be that hard surely. If so you could run on any box oil really. Coupled with crank seals...

Does the fact we're all here discussing carbys etc not make us bogans?? Lol

Cheers Jon, great answer and gives me good reference. Think I got this motor almost as is although done a few precautionary/tidying bits to it. Have not compression tested but judging from compression on pulling her over this isn't a problem. Had the block off to blast the clag from the water jacket...

Many thanks guys, defo food for thought. It bogs down in drive and runs fairly free otherwise, although not quite as crisp as I would like. From what I can conclude it seems logical to change the prop and the jet to be on the safe side. Has anyone ventured into the realms of crank seals for these be...