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February 29th, 2008, 09:26 AM   #21
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[quote="scrapveiw"]the berg is alive! it runs fine and the vibration from the engine , if anything is less than it was originally , it does seem a little more torquey than it was before and less violent but this is probably due to the half link in the timing chain altering the timing slightly , allthough it could be due to the increased length of the conrod.

but it works and i will keep you informed as to how long it lasts.

regards

scrap[/quote


UPDATE

i have put about 15 hours running on the berg and all seems well,

i can't believe the amount of torque i have gained.

scrap.
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February 29th, 2008, 01:39 PM   #22
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hi scrapview,

nice work. now theres 15 hours on it: how much did the end float change?

I've always thought if the crank is pressed together properly and not so skewiff that it needs a lot of tweaking then it shoudn't move much on the pin

but they do move on the new bikes during inital running. how did you go?

regards
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February 29th, 2008, 03:20 PM   #23
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not checked the end float yet , but it was 6 thou when i built it ,
it was about 4mm before i stripped it down and making lots of strange noises lol.

i don't think that the pin moves , i think it is more likely to be the mains settling down into the casings and the bearings bedding the balls/rollers in , then you have to take into account how hot or cold the engine is because alloy expands faster and more than the steel crank , so in effect you have more play when the engine is hot due to expansion.

i will put a few more hours on it then recheck the end float and let you know.

regards

scrap
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March 3rd, 2008, 12:36 AM   #24
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Originally Posted by bushmechanic
hi scrapview,

nice work. now theres 15 hours on it: how much did the end float change?

I've always thought if the crank is pressed together properly and not so skewiff that it needs a lot of tweaking then it shoudn't move much on the pin

but they do move on the new bikes during inital running. how did you go?

regards

i have lost 1 thou clearance when i checked after 20 hours or so of running,

but i am not using the standard issue crank pin.

the pin is from a rover diesel piston and i had 5 thou pinch into the crank webs,

also the ktm bearing is 5mm bigger O/D and 4mm wider so spreads the load on the pin a bit better than the original (in theory lol)

regards

scrap
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March 3rd, 2008, 01:57 AM   #25
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awesome, thats better than I imagined

looks like you improved on the oem effort

5 thou interferance fit doesn't seem that tight but I'm impressed by all accounts

clocked up 20 hours pretty quick too nice one

see you in the next cartoon
regards
Bushie
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March 3rd, 2008, 08:05 AM   #26
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yeh i like to get out and about on it , its fully road legal so i even choose it over my car for running around on .

my webs also butt straight up to the bearing insert , maybe this has had some effect?
but i don't know ? i don't know anyone who has been daft enough to try this before.

at worst it will all go horribly wrong and explode into several thousand pieces

i was going to put some pics on of the spacer plate , conrod ,1/2 link ,the bearing insert i used and the old rod and pin , but i don't seem to be able to upload the pics.

will keep trying though!

regards

scrap
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March 6th, 2008, 07:53 AM   #27
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some pics .

note the worn out pin and the wear mark 4/5s of the way up the con rod ,
this is where the con rod had been rubbing on the inner crank webs due to excessive end float in the crank and rod.

that was the strange clinking sound i heard every now and then at tick-over.


regards


scrap
Attached Files
File Type: pdf 1.pdf (362.5 KB, 62 views)
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March 6th, 2008, 09:33 AM   #28
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Hey Scrap, I wasn't able to download your file. I did notice that you have a "gallery" set up. Can you put your pictures there?
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March 6th, 2008, 10:34 AM   #29
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yeh if i could work out how to get them on there its a bit beyond me ,

has anyone else managed to veiw the pdf ? or is it a non runner,

NEIL E do you have acrobat reader installed? adobe reader?

you can right click on it then download to desktop and open it there , i could not veiw it on a friends pc , but i could when i saved it to his desktop, hope that helps.


regards

scrap
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March 6th, 2008, 01:07 PM   #30
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Did the save as, worked fine. Interesting spacer plate. Rather amazing side play to get that much rod wear.
Those mains were really moving back and forth. Did you loctite them or make sleeves for the cases?
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