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  #1  
Old 05-27-2011, 09:39 AM
Pencek Pencek is offline
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Default Runs but not good
I am new to this and not sure I am in the right place. I have a 782 that will start and run but not very well. When sitting on the seat the plug on the right side is black, really black all over. I put a spark tester on both plug wires, then connected them to the plugs. It looks like I have a white spark to both plugs. I thought I would have a blue spark. The spark to the right side is harder to see. It looks like the plug wires and coil are all orginial. I have though about replaceing coil, plug wires, points and condenser. Anyone have any suggestions? Oh, I do have new plugs in it. What should the points be set at?
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  #2  
Old 05-27-2011, 12:14 PM
JeffD JeffD is offline
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Your KT17 has a broken rod.
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Old 05-27-2011, 02:37 PM
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young enthusiest young enthusiest is offline
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I agree. Compression test it. (put thumb over spark plug hole and crank)
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Old 05-27-2011, 07:53 PM
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I am not disagreeing ,and I am always wanting to learn. But please explain to me how you can tell that an engine has a broken rod from the information the poster has given us.
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Old 05-27-2011, 09:28 PM
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If it did have a broken rod would you not hear a massive knock?
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  #6  
Old 05-27-2011, 10:35 PM
ad356 ad356 is offline
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Quote:
Originally Posted by ljones View Post
If it did have a broken rod would you not hear a massive knock?
well my thought is that since its a twin it would continue to run with 1 completely broken rod but only on one cylinder. there would be no knock because the rod is completely broken. im not sure if he has a broken rod, but i agree that a simple finger over the hole test would confirm of deny a broken rod. take spark plug off of other cylinder while doing test test. test at cranking speed more than fast enough.
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Old 05-27-2011, 11:04 PM
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aagitch aagitch is offline
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If you confirm the rod isn't broken, replace the points, condenser, and wires. I had a similiar problem on a 782 and it was the coil.
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Old 06-06-2011, 10:45 AM
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Turbo Archie Turbo Archie is offline
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Is it common for these to break the right rod?

I just replaced the HG and that didn't fix it.

I turned over the engine with the head off and the piston didn't move..


I hope this is an easy fix????




..
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Old 06-06-2011, 01:46 PM
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Matt G. Matt G. is offline
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That's a typical failure mode, but it doesn't necessarily have to be the right cylinder.

If it's a series I, keep the carb, jugs, heads, and pistons (if they aren't shot), and scrap the rest. If it's a series II, you can rebuild it but you'll need two new rods, main bearings, governor, gaskets, etc at a minimum, assuming the rod didn't take the block, cam, or anything else with it. I have never taken a blown one apart that didn't have block damage. The only way to know is to take it apart and inspect it.
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Old 06-06-2011, 03:40 PM
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Turbo Archie Turbo Archie is offline
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Thanks for the reply Matt.

Its a series II.

If there is block damage, can I just replace the bad part and use the rest. I see the block is two pieces.

I also have a window'd series I. Would that block work or anyof the parts?


I have looked and there are no cheap series II's for sale to replace it.


..
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