- Joined
- Dec 10, 2008
- Messages
- 7,253
![United-States Country flag](https://www.accessnorton.com/images/flags/shiny/32/United-States.png)
I have a set of Emgo pistons for my 750. Does anyone know a reliable source of decent circlips to suit in Melbourne, Oz?
https://www.bearingshop.com.au/store/categories/91580a175+mcmastercarr/
I have a set of Emgo pistons for my 750. Does anyone know a reliable source of decent circlips to suit in Melbourne, Oz?
Ok so now I’m worried. I purchased new emgo pistons for my engine rebuild and Hastings rings and circlips. The engine is back together and in the bike with a completion/ first startup date in December or January. I feel as if I checked the circlip and ring installation numerous times. Should I be concerned about my choice of pistons or rings/ circlips?
Ok so now I’m worried. I purchased new emgo pistons for my engine rebuild and Hastings rings and circlips. The engine is back together and in the bike with a completion/ first startup date in December or January. I feel as if I checked the circlip and ring installation numerous times. Should I be concerned about my choice of pistons or rings/ circlips?
No to the first question, flat circlips installed that came with the pistons with the sharp edges to the outside (non-piston) side. I spun the circlips to make sure they were seated. I’m not going to pull the head and cylinders again. Everyone has their own caution vs. laziness comfort (discomfort) point. If I lose a circlip you all will be the first (second) to know.Did you put in the wire circlips? Did you put in flat circlips which have a rounded edge? If rounded edges, did you put the rounded edge towards the outside of the piston?
If you answer yes to the first and third questions, tear it down.
If rounded edges and you were oblivious to which way to put the rounded edges, either tear it down, or worry yourself and suffer sleepless nights.
Remember, Murphey's Law .... If there are two ways to install something and you are oblivious to which way is right, then it is guaranteed to be installed wrong.
If you used square edge circlips (both sides), carefully installed them ensuring they were fully seated in the lands, sleep well.
Slick
Have no idea of hijacking, just found it was the place for that instead of creating a new thread.
Glad I was busy enough to keep me away from reassembling the engine with the +.020 JCC pistons.
So what do you think about the circlip groove
![]()
And the circlip
![]()
Should I buy new ones from AN to be sure?
![]()
And what about rings? Don't even know where they come from...
Hi NKN
I have EMGO +.0020" pistons in my MK3, I bought clips from A/N and used Haistings rings. All run in and happy memories of riding in Northern Spain this summer.
I just checked the crank on one of my motors and I see a 0.030" difference between TDC and BDC so I have an issue! I checked it a bunch of time by pushing the rods so that they were gently loaded inwards but the results were always the same. Weird thing is that the crank has never been reground and the only time it has been apart is when I cleaned out the sludge traps and I was pretty scrupulous about cleanliness and torqueing the studs.Just check the distance between the rod ends with the crank at BDC and then again at TDC. They should be the same distance apart in either position.
Realistically they are seldom perfect. -.005 difference is not uncommon. -.010 is difference is not so good.
This is a fairly common problem when the crank is ground by someone not familiar with these old rubber cranks.
Check it like this.
View attachment 13350 View attachment 13351
I just checked the crank on one of my motors and I see a 0.030" difference between TDC and BDC so I have an issue! I checked it a bunch of time by pushing the rods so that they were gently loaded inwards but the results were always the same. Weird thing is that the crank has never been reground and the only time it has been apart is when I cleaned out the sludge traps and I was pretty scrupulous about cleanliness and torqueing the studs.
It's not just possible but 100% certain they are made by JJC of Taiwan, as are Emgo and Cycle craft pistons. Under and inside there will be JJC cast into the piston.
http://www.jcc-tw.com/en/
I have not fitted any of the new [JCC] Hepolites
Do you know if the JCC pistons sold as Hepolites come with black circlips in a red plastic bag like the Emgos do?
if you have a 850 with 77mm std bore , please don't buy 73mm rings ........In need for new rings, received a quote for some Hastings stuff from England. Could somebody tells me if it's the good size for a 1974 850 Commando:
73mm STD bore with 1/16 x 1/16 x 5/32 grooves in, +.020”