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Fuel Fuel Delivery


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February 16th, 2017, 02:18 AM   #31
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I'm actually considering taking the whole head off and see everything is okay. It's not a bad idea since it has been unopened for years, so before it blows the whole engine if something is wrong with the head, timing chain etc.

Maybe take it to a bikeshop if it seems bad.
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February 16th, 2017, 02:47 AM   #32
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the 450s are dropping the heads off the exhausdt valves or the single valve springs are breaking. peple cheapskate and fit only one new exhaust valve and so the other head falls off! it is the fault of the "percussion" from the single valve springs and only happens to the 450. not even one 550 or 650 so it is revs related as well.

not to say it is this but so that others change their exhaust valves and their springs soon enough. I have two blown 450 ewngines here now and what with some liner and jetting troubles I am sick 'n tired at the mo with 450s....

I'll get over it....

Taffy
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February 16th, 2017, 05:58 AM   #33
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Thanks Taffy, good to know. I think I hassled last time to put back the valve cover. I will take a real deep look inside the valves and springs next week and see for anything you suggested.
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March 9th, 2017, 06:50 AM   #34
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It all feels funny afterwards, but now that I took apart the valvecover, I found 2-3mm clap in my exhaust cam follower bearing. There's my problem. I missed it earlier.

Is it difficult to change ? The bearing itself is quite expensive but no options.
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March 9th, 2017, 10:46 AM   #35
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go to the new wiki at the top of the page and you will find info under engine upgrades.
easy to replace. i use a vise and a small pin as a drift

Last edited by ned37; March 9th, 2017 at 10:54 AM. Reason: noyb
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March 10th, 2017, 12:29 AM   #36
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Thanx I tried to remove the old according to advices but the pin was so worn out a needle bearing got stuck immediately in between that the rocker arm went to the bin. I did't find a good way for this to not happen, a feeler did't help. Have to really congratulate myself but lesson learned.

Inlet bearing came off easy, since the pin was 2mm less worn
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