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Post by Clinton Cool on Sept 16, 2020 11:47:48 GMT
It's a Honda MSX125, also known as a Grom.
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Post by Deleted on Sept 16, 2020 12:04:52 GMT
Its called a 'Grom' (bloody stupid name) and the exhaust pipe has the same arrangement as every other bike ever manufactured in Japan - engineering studs onto which nuts are screwed. Ricco stated the studs are 12mm which seems a bit big because the Japs usually use a 13mm or sometimes a 14mm nut in this application.
Heat the nut as much as possible. Very gently attempt to move the nut just a tiny smidge both ways. Repeat until either the nut moves or the stud shears. There is something called a 'nut splitter' but sounds like it wont fit there. Some workshops have a special gadget for these problems which is an electrically heated metal band that fits snugly around the nut so you might want to see if someone has one (because it probably involves a top-end disassembly if the stud shears).
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Post by Deleted on Sept 16, 2020 12:10:15 GMT
Also once saw (on that cable show about old military vehicles) some seized parts heated to cherry-red and then doused in water to break the rust 'bond'. I wouldn't recommend that given the proximity of steel to alloy but it demonstrated the principle of using heat to un-sieze rusted parts nicely. This has worked well on many a seized Seagull fastener. www.toolstation.com/auto-blowlamp/p43245?bvstate=pg:2/ct:r
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Post by TonyDunkley on Sept 16, 2020 13:06:12 GMT
The question is phrased in mechanical gibberish, . . bolts don't "screw on to threaded studs" - they both have male threads. What you're probably describing are two elongated nuts - ie. deep plain or dome nuts with their largest dimension measured along the axis of the nut instead of across the flats - or at right angles to the axis - with little to no clearance between the corners and flats of the nuts and the wall of the exhaust pipe where it emerges from the flange. If this is so, there are ways to go about shifting stubborn ones. Post a photo or two, including views of the gap between the nuts and the wall of the pipe, and of the 'end on' access for using a modified socket. Yes, exactly. Deep plain nuts. I've damaged part of the nut with my attempt with the open ended spanner but because it's deep there's still undamaged material to have a go at. I can't post pictures unfortunately. If there isn't enough clearance between the flats and corners of the nuts and the wall of the exhaust pipe to get a ring spanner on them, the best bet would be a thin walled deep hexagon (as opposed to a bi-hexagon) socket. Second best would be a standard deep socket of either type with a quarter to one third of the circumference of it's outer wall ground down as necessary. Third best option with deep/elongated nuts with no space to get a ring spanner or a socket of any sort on them is to use two, or even three, open-enders side by side on the same pairs of the flats on the nuts. Whatever tool you end up using, heat the difficult nut up as quickly as possible and try to move it immediately - don't wait for it to cool. Start by applying some force clockwise - in the direction to tighten it - before attempting to move it in the other direction, and then once it's moved a little, cool it down by squirting some penetrating oil, or diesel, around the base of the nut until it's cooled down enough to touch. Leave the penetrating oil to soak in for a few minutes, and then try unscrewing in small movements, no more than one third to half a turn at a time alternating with more oil and similar movements/turns back in the opposite direction.
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Post by Deleted on Sept 16, 2020 13:54:18 GMT
Or scrap the bike and get a proper one knowing you won't be limited by the narrow boat situation in future.
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Post by Clinton Cool on Sept 16, 2020 14:09:56 GMT
Or scrap the bike and get a proper one knowing you won't be limited by the narrow boat situation in future. You and I often seem to think alike. This has crossed my mind. I fancy a 250, café racer style. The project will then be to fit a surfboard rack. They do them in Bali, they swivel out of the way when not in use. Only 25 quid. Nobody seems to know if they are legal or not over here so I'll probably get arrested at some stage. All part of the fun.
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Post by naughtyfox on Sept 16, 2020 14:21:44 GMT
Yes, blow torch plus hitting with hammer. Baby seals, run away!
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Post by Clinton Cool on Sept 16, 2020 15:11:44 GMT
All this talk about possible snapped bolts is putting fear into my soul. I might sack the idea and try something else instead. I've tried undoing the rear of the exhaust and pushing down on it to give a bit more clearance for the sump plug. Can get another 2mm or so but I don't know how long the thread is on the sump plug yet, whether the extra clearance will be enough to get it out. I suspect not. Otherwise just unscrew it as much as possible and hope that's enough to drain the oil out, maybe leave it draining overnight on the towpath if it only drips out slowly. Or finally, ignore the plug completely, try to drain out as much as possible by inserting a plastic tube into the engine and pumping, as I do with my boat engine.
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Post by Deleted on Sept 16, 2020 16:03:24 GMT
I was going to suggest going through the dipstick hole with one of those suction pumps, while the oil is hot, but not sure if you have one of the pumps.
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Post by Clinton Cool on Sept 16, 2020 16:09:00 GMT
Right that's decided, it's a pump out job. I have a pump that I use for my boat engine. I've had a fish around in there with a bit of tubing. It's a bit of a bastard really, the tube can only access the nearside of the engine so I'm going to have to lean it right over in order to get most of the old oil out. I think I'll tie a rope to the handrail of the boat of the correct length so that the bike is at around 45 degrees, being aware of any passing boats
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Post by Deleted on Sept 16, 2020 16:16:20 GMT
What about just not changing the oil?
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Post by Deleted on Sept 16, 2020 16:19:32 GMT
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Post by Deleted on Sept 16, 2020 16:24:04 GMT
TD already suggested a nut splitter might not fit.
Of course Jim got in earlier with the Dremel thing which was a sound solution.
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Post by Deleted on Sept 16, 2020 16:34:35 GMT
TD already suggested a nut splitter might not fit.* * may not be true
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Post by Deleted on Sept 16, 2020 16:35:10 GMT
True
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