noel063 Posted January 16, 2021 Report Share Posted January 16, 2021 Does anybody know if the exhaust mid sections differ between 250 and 350 on m158 onwards. Quote Link to comment Share on other sites More sharing options...
pschrauber Posted January 16, 2021 Report Share Posted January 16, 2021 The exhaust flange of the 350 and the 250 might not fit in comparision that the only thing I know, all other components are pretty much the same. I experienced that difference as I bought a much used middle exhaust from a 198a rebuild it an also (luckily) made the exhaust pipe deattachable to exchange the pipe or clean the hole tube inside easily without opening the middle box, to bolt on ny 199b. So you might do there the measurements to determine that it fit. (axis of the 4 exhaust bolts in comoarison to the axis of the flange holes if the middle exhaust section). Quote Link to comment Share on other sites More sharing options...
noel063 Posted January 16, 2021 Author Report Share Posted January 16, 2021 The first sections differ between 250 and 350 and the bends can differ slightly. As long as the silencer is the same Quote Link to comment Share on other sites More sharing options...
woody Posted January 18, 2021 Report Share Posted January 18, 2021 On 1/16/2021 at 11:05 AM, noel063 said: Does anybody know if the exhaust mid sections differ between 250 and 350 on m158 onwards. Differs in what way? It depends on which aspect you mean and what you want to do I think physically the actual silencer bodies are the same size model to model although they come off the front pipe at different angles depending on the height of the pipe bend as this differs amongst the 250 models. The 350 models also have different bends The outlet to the rear silencer on the 250 is a smaller diameter than the 350. 25mm OD against 27/28mm OD I'm fairly certain that the inner core is the same diameter on 250/350 The flange that bolts to the cylinder has a bigger stud spacing on the 350 Earlier model pipes aren't a good fit on the A or B models as they had the engine raised in the frame so had less of a bend to clear the underside of the tank. A higher bend will be too close or even contact with the tank and the heat will cause damage, especially to a plastic tank Quote Link to comment Share on other sites More sharing options...
noel063 Posted January 19, 2021 Author Report Share Posted January 19, 2021 Hi Woody I’m thinking of modifying the front section. I just need a silencer section and wanted to check. Thanks for your help Quote Link to comment Share on other sites More sharing options...
nigel dabster Posted January 22, 2021 Report Share Posted January 22, 2021 i would modify central section if you want an improvement. Quote Link to comment Share on other sites More sharing options...
noel063 Posted January 23, 2021 Author Report Share Posted January 23, 2021 22 hours ago, nigel dabster said: i would modify central section if you want an improvement. Probably will do 1 Quote Link to comment Share on other sites More sharing options...
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