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Old 01-05-2017, 11:02 AM
750dave 750dave is offline
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Default rusted downpipe threads

About 100 years ago I remember seeing an article in 100% about freeing rusted nuts holding downpipe flanges. It had the usual tips like soaking them in oil and using an impact wrench, But there were some real gems like after a 24 hour soak run the engine up to operating temperature the idea being to replicate the conditions under which the nuts/studs rusted in the first place.
I now find myself in the position of having to replace a stock exhaust before my bike is examined by an insurance bod. The nuts are just blobs of rust but they used to be a steel tube with a thread in one end and a hex/allen hole in the other.
I really can't afford the hassle of having to deal with studs sheared off at the head as there is no access to get a drill on them.
I'm trying to collect a battery of tips and using them all together. tho' if I start looking through my collection of back issues I won't come up for air for days.
It's a kwak vn800 with steel nuts and studs into an ali head. If any one can help I'd be really grateful
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Old 01-05-2017, 11:52 AM
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strima strima is offline
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If you can weld a nut on the end, the heat should help free off any corrosion and give you something better to grip onto.
The best part of you ran down the crack of your mothers arse!!!
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Old 01-05-2017, 01:11 PM
750dave 750dave is offline
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Thanx strima. mostly I'm worried about shearing the stud off flush with the head. All four are in a bad way re rusty nuts and I can't get a good look at the studs while the flanges are in situ. If the nuts come off cleanly I'll just clean up the threads and fit new nuts. I don't want to get involved in taking the studs out unless they're obviously loose.
The bottom line is that a woman pulled out on me last week and it looks like the headstock and frame are pissed which is a write-off but I can't remember if I declared the aftermarket zorst when I bought the policy 10 months ago. If I can put the stock one back it negates the chance of my policy being invalidated for non disclosure and it saves me having to spend 550 on a new pair of straight shots for the vn I've got to replace her.
Thanx again for the quick reply
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Old 02-05-2017, 05:13 AM
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Friar Tuck Friar Tuck is offline
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Couldn't you just replace the end cans with some stock cans? I must admit this is the first time I've heard about an insurance claim being refused because of wrong exhausts being fitted. Lots of bikes are fitted with after market jobbies nowadays, refitting them usually only affects MOTs. If you are that worried I'd just take off the end cans (if there are any of course, you do have some dort of baffling I take it?) and get hold of some old cans with a load of dents and say to the inspector that the got damaged in the crash?

At least then you have time to the down pipes seen to at your leisure. When I bought back my old bike I had exactly the same problem with downpipes rusting through. I chickened out and took it to DRD's in North Walsham and got them to sort it!
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Old 02-05-2017, 08:28 AM
Tricky-Dicky Tricky-Dicky is offline
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I would be very surprised if an insurance claim inspector could accurately identify just which exhaust should be fitted to any particular bike, i have had them examine cars and unless its absolutely glaringly obviously an aftermarket part they wont know.
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Old 02-05-2017, 12:08 PM
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SS2 SS2 is offline
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Yeah, you might get a jobsworth but in my experience insurance examiner types are pretty relaxed about such things. I (allegedly) once had an XJ650 chop that I hadn't declared the extensive mods on and the assessor was good as gold. Said he would have normally just wrote it off but seeing how much work had gone into it, he offered me the option of whether I wanted him to make it financially unviable for repair or not. Very civil I thought. That was a no fault claim though, they might be a bit arsier if the company that's paying them had to pay?
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Old 02-05-2017, 01:27 PM
750dave 750dave is offline
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Unfortunateely they are obviously a/m pipes and if I leave the down pipes on I still have to buy a new set for my new bike.
I think I'll just buy a set of replacement nuts ant grind the old ones away with a dremel. that seems the safest bet if not the quickest.thanx for your feedback
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