Maintenance & Technical > KX500 Original

engine mounting

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chrisxj:
hello gentlemen i need to know if the engine mounting holes are the same on the cases through out the different years i.e. will a 91 engine mount to an 86 frame

jonny500:
no is the answer, you may get it to bolt in but the exhaust will not go on due the frame difference. 85 or 86 motor are your only
choices  an possibly 84

dave916:

--- Quote from: jonny500 on October 17, 2011, 05:50:10 AM ---no is the answer, you may get it to bolt in but the exhaust will go on due the frame difference. 85 or 86 motor are your only
choices  an possibly 84

--- End quote ---

Jonny i think 89/on motor should fit in the 86 chassis ,
the only thing you might need is the 86 inlet manifold 

jonny500:
no it wont (in the nicest possible way) :-D. the 86 and earlier had a single cradle frame where the exhaust went round the out side of the single down tube. the 87 on had a semi twin cradle where the exhaust went in between the 2 cradles. the engine may bolt in but the left side cradle tube will be directly over the exhaust port. below is the 86 and the 87 look at where the pipe comes out of the cylinder on each. also the exhaust fits directly in to the cylinder with no manifold. it could be done but major frame mods would be needed

dave916:
thats a 86 kx125  not a 500

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