Manfred's TR1. Discussion Boards - Mixing parts from various motors?

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30.06.25 at 23:27:21

Manfred's TR1. Discussion Boards › Old TR1 Discussion Boards (read only) › Discussion Board 2000
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Mixing parts from various motors? (Read 6255 times)

Morten Standahl(Guest) Ex Member	Mixing parts from various motors? 11.12.00 at 00:24:00 First of all, thanks for the existence of this internet site!!! Also thanks for advertising the book "Yamaha XV - Von der TR1 zu Vmax und Drag Star". I bought it and I think it's great! Now to my question: I have 2 TR1 motors and 1 from "Midnight Special" XV1000. Is it possible to use the Midnight Special cylinders/tops and engine house internals (gears, crankshaft) on/in an old TR1 engine housing?. According to specifications, the motors seem to be identical, except for the output gear for the shaft drive. I suppose I have to grind/sand flat the mating surfaces between cylinders and engine house? Are there other critical factors to observe? Even the smallest trickle of tips is appreciated, especially from those of you who have any experience with this. The motor currently in use leaks oil from under - I think the two engine halves are badly joined by the former owner. Are there any glue or similar that can be applied on engine joints without taking the engine apart? Epoxy? Best regards Morten
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Harry Spruit(Guest) Ex Member	Mixing parts from various motors? Reply #1 - 21.01.00 at 12:14:00 I don't know very much yet about TR 1's and the likes, because I own one only for the last few weeks, but what I know is, that there is a difference in chain and shaft driven engines is far as the engine parts are concerned. The left crankcase halves are totally different. The left side at the rear houses either the output bearing for the chain drive, or the output bearing and conical gears and bearing for the drive shaft. So you can't put a shaft drive engine into a chain drive bike without taking the engine apart into basic components. Also the gearbox output shafts are totally different. It might even be easer to put the rear frame of a shaft driven bike onto a chain driven one, but it involves the swapping of the rearwheels and probably the exhaust system and of course the rear fork bearing system. All in all think it over before you start swapping parts around. You might be in for a few surprises. Harry Spruit
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Morten Standahl(Guest) Ex Member	Mixing parts from various motors? Reply #2 - 29.01.00 at 14:27:00 Your comment is absolutely relevant, Harry. I won't even consider dismantling the engine currently in use before I really have to. I've read that the cylinder heads of the Midnight Special (XV1000) has some improved oil supply modifications (retains a portion of oil that gets to the cams quickly at startup). May be I can change cylinders and heads when need arises. Now I'm just anxious to get the bike in order for the coming season (seems far off, looking out the window though - fresh snow in abundance). Regards Morten Happy new year!
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Armin Föll(Guest) Ex Member	Mixing parts from various motors? Reply #3 - 07.02.01 at 20:02:00 Hi Morten, the zylinder heads of the TR1 had also changed in late 82. From then on all XV1000 engines had teh oil reservoir in the zylinder heads to improve cold start stability. Tthe midnight special is from 82 or later as I hope to remember well and therefore it should have already the new heads. Beside of the outlet there should be no difference in any parts of the engine. If you have original cylinder heads you might hav a problem with the cylinder head gaskets. But to get rid of that problem you need not to change the engine. It's rather easy to repair. If you want more information about this contact me again via email. regards Armin
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