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Post by midlifecrisisrd on Oct 14, 2020 19:22:48 GMT 1
Could it be gasket?
It's lost a bit of the crown edge on one side
I'd have expected some crown damages if really lean
Steve
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Post by 4l04ever on Oct 14, 2020 19:22:51 GMT 1
Were you running the oil pump?
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Post by perazzi350 on Oct 14, 2020 19:23:57 GMT 1
If it was set on the dyno it shouldn't be mixture Any chance it has stopped oiling that cylinder? Steve No it runs on premix, I know Dave had trouble with it going weak at some stage about 8k rpm
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Post by headcoats on Oct 14, 2020 19:33:30 GMT 1
What was your final jetting ?
Never ran less than 152 main jet (YPVS) engine
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Post by midlifecrisisrd on Oct 14, 2020 19:37:58 GMT 1
If it was down to jetting there would be signs on the other cylinder
Steve
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Post by perazzi350 on Oct 14, 2020 19:51:01 GMT 1
What was your final jetting ? Never ran less than 152 main jet (YPVS) engine jet in this side is 140 main i checked to see if it was blocked causing weak, old carbs ran on 150's, Dave had trouble with one going weak at 8k rpm , crank was also out of spec .8 and .9 on other side so going to rebuild whole thing. cheers Steve
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Post by midlifecrisisrd on Oct 14, 2020 20:03:05 GMT 1
Initially thought that was small but forgot it's LC
Noticed you were on 2.25 bore
Have seen issues with hot spots if bore is not central in the liner
Its right thin at that size
Does the liner look the same thickness all the way round or thinner at the front
Steve
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Post by perazzi350 on Oct 14, 2020 20:17:35 GMT 1
Initially thought that was small but forgot it's LC Noticed you were on 2.25 bore Have seen issues with hot spots if bore is not central in the liner Its right thin at that size Does the liner look the same thickness all the way round or thinner at the front Steve Barrel was really scored after this so i have sent them off to PJME to be relined so start from fresh, hopefully it will cure it , I read some people don't like sleeved barrels but have little choice . Steve
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Post by dusty350 on Oct 14, 2020 20:24:06 GMT 1
Think there is only 1 person that doesn't like relined barrels !! Paul at PJME has done thousands of them. I've had them on an Lc, with no problems at all Dusty
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Post by perazzi350 on Oct 14, 2020 20:55:14 GMT 1
Think there is only 1 person that doesn't like relined barrels !! Paul at PJME has done thousands of them. I've had them on an Lc, with no problems at all Dusty Hi Dusty, Thank for the reassurance , and at least i have original bore sizes this way, looks like I am going to be busy never done bottom end rebuild so will be looking at your builds again and again, I have six weeks to prepare ,thats how long for sleeves so collecting crank [PJME ]and everything I need . Cheers Steve
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Post by dusty350 on Oct 15, 2020 7:23:47 GMT 1
I bought one of Paul's new cranks too - again, absolutely spot on Good luck with the rebuild Dusty
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Post by mouse on Oct 15, 2020 7:58:49 GMT 1
Sorry to see this has happened, Paul at PJ should be able to tell you why he thinks it has seized, please let us know what he says. Good luck with it
Mouse
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legin
L plate rider.
Posts: 14
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Post by legin on Oct 15, 2020 8:25:41 GMT 1
Is this the barrel you had welded at the stud. If so did you check the barrel was still round and parallel. The chances of doing that much welding and not losing the dimensions is slim I would say.
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Post by moneypit on Oct 23, 2020 17:35:29 GMT 1
Hi guys latest dyno run from Dave ( Mutts) 67.4hp highest was 68.9 l believe so well happy 😃. Sent bike with new pwk 28’s to be fitted with Mutts new pipes and my end cans , bike was a real pig for him to sort out (sorry Dave) ended up with Dyno pro, and ignitech fitted but also a lot of wiring probs which he sorted out so a massive thanks to you Dave your a star ⭐️ 👍👍
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Post by perazzi350 on Oct 23, 2020 19:13:37 GMT 1
Hello everyone , got a nice package today new crank arrived and all the seals and O rings, I ordered genuine Yamaha little end bearings, when I looked the crank had little ends in it anyway!. I will fit the genuine ones now I’ve bought them so just waiting for Three Bond to arrive then ready to start. I have a question, my gear shaft has slight in and out play on it is this a concern?
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Post by dusty350 on Oct 23, 2020 19:24:43 GMT 1
Hi Regards the gear shaft - no problem, they all have some small amount of in and out movement. There is a post cast into the clutch casing, that presses against the gear shaft - it stops the gear shaft moving too far to the clutch side. Enjoy the build
Dusty
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Post by perazzi350 on Oct 23, 2020 19:52:10 GMT 1
Hi Regards the gear shaft - no problem, they all have some small amount of in and out movement. There is a post cast into the clutch casing, that presses against the gear shaft - it stops the gear shaft moving too far to the clutch side. Enjoy the build Dusty Ok thanks For that Dusty
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Post by 4l04ever on Oct 24, 2020 10:26:01 GMT 1
The cylinders on this engine had quite a lot of porting done to the transfer ports and the outer walls were thinner than usual. I made some wider than normal gaskets for these to give them a better chance of sealing. If you need some more of the wider kind, let me know.
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Post by Tobyjugs on Oct 26, 2020 22:07:30 GMT 1
I would advise the use of some Loctite 5910 to make a good seal on the base gaskets. Make sure the surfaces are clean and decreased and apply the sealant with a very small paint brush. No need to gloop it on, just a fine layer. This sealant is very good. I don't normally use it because it is difficult to part the components later, but I do use it on the base gaskets when the transfer walls are thin.
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Post by shaunthe2nd on Oct 26, 2020 22:20:09 GMT 1
Gosh, just read yr last few months of posts, this bike has been a devil for some reason. Looked great in the KR colours though. Hope you get is sorted for the spring. Good luck with it.
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Post by perazzi350 on Oct 27, 2020 20:08:33 GMT 1
The cylinders on this engine had quite a lot of porting done to the transfer ports and the outer walls were thinner than usual. I made some wider than normal gaskets for these to give them a better chance of sealing. If you need some more of the wider kind, let me know. Hi Rob , yes i will be needing some gaskets later on once i start the rebuild so i will be in touch thanks. Steve
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Post by perazzi350 on Oct 27, 2020 20:12:06 GMT 1
Gosh, just read yr last few months of posts, this bike has been a devil for some reason. Looked great in the KR colours though. Hope you get is sorted for the spring. Good luck with it. Hi Shaun, yes its been a right bstard bike but it knows its got me hooked LOL, I will get it sorted though. Cheers Steve
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Post by perazzi350 on Oct 27, 2020 20:23:47 GMT 1
I would advise the use of some Loctite 5910 to make a good seal on the base gaskets. Make sure the surfaces are clean and decreased and apply the sealant with a very small paint brush. No need to gloop it on, just a fine layer. This sealant is very good. I don't normally use it because it is difficult to part the components later, but I do use it on the base gaskets when the transfer walls are thin. Hi ,Thanks for this information its good to know about this product. Cheers Steve
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Post by perazzi350 on Oct 27, 2020 20:57:36 GMT 1
So because my transfer walls are thin on the outer edge could I get a small bit welded on them to make them larger, and how thin is to thin ?
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Post by Tobyjugs on Oct 27, 2020 21:47:56 GMT 1
That should seal. I would use Robs siamese gaskets.
Welding it could cause more problems. Just pressure test it once built up.
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Post by perazzi350 on Oct 27, 2020 21:56:50 GMT 1
Thanks I am going to get Robs gaskets and the use the loctite you said Cheers Steve.
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Post by mouse on Oct 28, 2020 8:23:55 GMT 1
Hi, good luck with the rebuild, did you ever discover why she seized?
Mouse
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Post by 4l04ever on Oct 28, 2020 19:23:01 GMT 1
I have seen quite a few LCs which go leaner on the road than when on the dyno. My bike likes 230 mains on the dyno, but more like 280 or 290 on the road.
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Post by perazzi350 on Oct 28, 2020 20:02:04 GMT 1
Hi, good luck with the rebuild, did you ever discover why she seized? Mouse Hi Mouse , no i still don't know why its seized I can only think it developed an air leak,I asked Paul to look at the porting he said Exhaust port was a bit large so after a chat he is going to tone it down a bit when he sleeves them. Cheers Steve
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Post by perazzi350 on Oct 28, 2020 20:04:58 GMT 1
I have seen quite a few LCs which go leaner on the road than when on the dyno. My bike likes 230 mains on the dyno, but more like 280 or 290 on the road. Rob why is this ? is it because more air passes through the pod filters as it is moving along ?
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