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Post by acceleration on Nov 1, 2018 11:59:22 GMT -5
We completed Dave's crank rebuild a couple of weeks ago.As you could see in the last pictures it started out at .007 at one end and .009 on the other end.Wasn't straight at all.All the bearings and seals were replaced including the big end rod bearings.One rod was pitted on the pin end so we replaced it.The new rod was 10 grams heavier so we re-balanced it and matched the other two rods.Yes we do have a rod balancing scale.Not everyone re-building these cranks has a balancing scale ? Reassembled it, and got it with in factory spec.But went the added distance to get the run out UNDER .001 It took a little effort to get it there, because the crank was way out to begin with.But it is Duane's resolve to make an effort to get the run out on ALL the cranks we do,at under .001 and so far EVERY one rebuilt has been under .001 be it a Triple crank or a Yamaha crank.Here are a couple of pics including one with the rod we replaced.Thanks to Dave for giving us the work.We appreciate it.
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Post by norm on Nov 1, 2018 13:20:26 GMT -5
We completed Dave's crank rebuild a couple of weeks ago.As you could see in the last pictures it started out at .007 at one end and .009 on the other end.Wasn't straight at all.All the bearings and seals were replaced including the big end rod bearings.One rod was pitted on the pin end so we replaced it.The new rod was 10 grams heavier so we re-balanced it and matched the other two rods.Yes we do have a rod balancing scale.Not everyone re-building these cranks has a balancing scale ? Reassembled it, and got it with in factory spec.But went the added distance to get the run out UNDER .001 It took a little effort to get it there, because the crank was way out to begin with.But it is Duane's resolve to make an effort to get the run out on ALL the cranks we do,at under .001 and so far EVERY one rebuilt has been under .001 be it a Triple crank or a Yamaha crank.Here are a couple of pics including one with the rod we replaced.Thanks to Dave for giving us the work.We appreciate it. The crank looks great Keith. Looking forward to getting it in my motor! Thanks for posting. Dave
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Post by crazycunuc on Nov 1, 2018 13:41:21 GMT -5
Looks great!!
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Post by acceleration on Nov 1, 2018 14:47:05 GMT -5
Yeah, It is a nice piece, and a work of art.Duane is a master at building these cranks.And as they say the straighter it is and the better it seals.The MORE "power" you are going to mak, and it will live a long time. I can't wait to see you put it in your motor and get it up and running too !!Thanks again for sending it to us Dave !!
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Post by norm on Nov 15, 2018 9:31:52 GMT -5
I have finished putting the Z1 stuff put away and have made a bit of progress on the H2 rebuild. I completed the fork rebuild, the wheels have new bearings, spokes and tires and my chain guard has been refinished. I am also trying to repair a stator that came in a box of parts I got at Paris a few years ago. I now have some used pickups I can install. However, i tested the circuits and the low speed coil resistance was only 140 ohms. So it will need to be replaced as well. I have looked at Jim's site for a new low speed coil and also have read through the instructions to do this. All the other tests checked out OK and the overall stator condition seems good enough to give this repair a go...
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Post by crazycunuc on Nov 15, 2018 10:24:44 GMT -5
Looking Great!! Your H2 is going to be beautiful
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Post by norm on Nov 20, 2018 9:03:36 GMT -5
The low speed coil is out. I followed Jim's instructions which made it pretty straight forward. I was able to dig out a good length of wire on the right side of the old coil.
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Post by norm on Dec 4, 2018 16:18:30 GMT -5
A new low speed coil for the stator is on the way to me. I took the time to complete the re-assembly of the transmission shafts. Everything engages well and moves smoothly. I installed new Kawasaki and SKF bearings and circlips as well.
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Post by crazycunuc on Dec 4, 2018 16:19:48 GMT -5
She's beautiful
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Post by Curtis on Dec 4, 2018 20:09:15 GMT -5
There is a really good shimming compilation on the resource site if required!
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Post by brewguy on Dec 5, 2018 23:56:15 GMT -5
looks great Dave
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Post by acceleration on Dec 14, 2018 10:04:32 GMT -5
We completed the crank rebuild on Dave's H2 750 crank and it is ready to go.Dave will be visiting soon.Wanted to mention that we are working on another H2 750 crank right now too.And it too is out and has a run out of .009 !! Which we will correct in the process and bring it down to under .001 Wanted to mention, having a balancing scale for the connecting rods, that we also balanced the rods in the process of rebuilding Dave's crank.Something that not all crank rebuilders do ? Just for example we weighed the rods from the 100% factory stock H2 750 crank that we are presently rebuilding and the weights are: #1 = 178.8 /#2= 191.4 / #3 = 186.5 The rods are NOT balanced at the factory when they build these cranks and they do not have a run out of under .001 the average is around .003 at factory specs and often much higher.When we are completed with this crank it will be a under .001 and the rods will be balance too.
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Post by norm on Dec 14, 2018 13:48:02 GMT -5
The new low speed coil arrived this week and I put in this morning without any issues. When I was done, I measured a resistance of 210 ohms so everything is looking good. I also have acquired two used pickups (signal generator coils) to install to complete the rebuild. After soldering the wires to install the first unit, I measured the resistance and got a reading of 165 ohms. I then checked the second pickup and got a reading of 164 ohms. Pic below. I am concerned this is too low and I may run into problems with poor spark. Any advice please?
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Post by brewguy on Dec 17, 2018 2:35:08 GMT -5
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Post by norm on Dec 17, 2018 19:06:18 GMT -5
Thanks for the link Doug. Very interesting, It raises the same question I have which is "Will the below spec resistance of 165 ohms in the SG coil impact performance? Below is a notable comment in that thread "from a very reliable source"....
"No, the signal generators either trigger the CDI unit or they don't. They can't cause a weak spark. If the right cylinder is firing reliably, don't worry about the slightly low resistance measurement." That makes me think I should go ahead and give it a try and see what happens.
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