How To Remove Piston Circlips
piston pin retainer clip removal
Trying to push up the ol' Maico motor, but I need to remove a pin retainer prune to come in from the other side of the piston....
Unfortunately this crappy clip is merely a split band (patently that's what they're all running nowadays) - there's no "ears" bent into the ends to catch hold of with needle-nose pliers. Before I but dig them out, is there a trick to this, or do yous do the best you lot tin and hopefully not chew up the lands around the groove?
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Does the piston take a little notch / cutaway nigh the pivot pigsty? If and then, I usually accept a small pair of needle nose pliers,grabbing the clip, and rotating it until the open finish of the prune is hanging over into the notch slightly, giving you an finish to grab onto with the pliers.
You will have to take small bites on the prune to rotate it in the groove to get the terminate in the right position .
Or just stick a small awl / flatblade scrwediver into the notch behind / underneath the clip ,and pop it out.
project racer wrote:
Does the piston have a little notch / cutaway most the pin hole? If so, I usually accept a pocket-size pair of needle olfactory organ ...more
projection racer wrote:
Does the piston have a little notch / cutaway near the pin hole? If so, I usually accept a modest pair of needle olfactory organ pliers,grabbing the clip, and rotating it until the open up cease of the clip is hanging over into the notch slightly, giving you lot an terminate to catch onto with the pliers.
You will have to take modest bites on the clip to rotate it in the groove to get the stop in the right position .
Or just stick a small awl / flatblade scrwediver into the notch backside / underneath the clip ,and pop it out.
Thanks Project Racer 
I actually simply got it out - One of the guys over on the yahoo Maico group said he just uses the jeweler'due south screwdriver. Information technology wasn't pretty, only apparently there just isn't "the right tool" for this job. I wish the piston had a notch at a bespeak on the groove - It'south a menstruum (mid-late '70's) Wiseco, and the clips I pulled out of it had bent ends - apparently not designed to be used with clips without bent ends.
I ordered new clips from ii different sources, and they all were of the uncomplicated split ring blueprint. I can only imagine it's much cheaper to produce these split rings with no angle, and justify it by saying they're lighter weight and less run a risk of a clip coming
unseated in a running motor.
I had put a clip in ane side, and ran in difficulty during the piston install and had to restart. The adjacent top finish tear down will be dreaded, when I've got to remove a split ring prune with the pin in place behind it...
project racer wrote:
Does the piston take a footling notch / cutaway virtually the pin pigsty? If so, I commonly take a small pair of needle nose ...more than
project racer wrote:
Does the piston have a fiddling notch / cutaway near the pin pigsty? If so, I usually take a small-scale pair of needle olfactory organ pliers,grabbing the prune, and rotating it until the open end of the clip is hanging over into the notch slightly, giving you an cease to grab onto with the pliers.
You will take to take small bites on the prune to rotate information technology in the groove to become the end in the right position .
Or just stick a small-scale awl / flatblade scrwediver into the notch behind / underneath the clip ,and pop it out.
prillernut wrote:
Thanks Project Racer
I really just got information technology out - One of the guys over on the yahoo Maico group said he simply uses the ...more than
prillernut wrote:
Thanks Project Racer
I actually but got it out - One of the guys over on the yahoo Maico group said he just uses the jeweler'due south screwdriver. It wasn't pretty, just apparently in that location just isn't "the correct tool" for this task. I wish the piston had a notch at a point on the groove - It'southward a period (mid-belatedly '70'south) Wiseco, and the clips I pulled out of information technology had bent ends - apparently non designed to be used with clips without bent ends.
I ordered new clips from two different sources, and they all were of the uncomplicated separate ring design. I tin can but imagine it's much cheaper to produce these carve up rings with no bending, and justify information technology by proverb they're lighter weight and less chance of a clip coming
unseated in a running motor.I had put a clip in i side, and ran in difficulty during the piston install and had to restart. The adjacent top stop tear down will be dreaded, when I've got to remove a split ring clip with the pivot in place backside it...
The stock piston has a notch so y'all can be able to remove the circlip by either a small needle nose pliers or something like a packing scribe. Yous might want to use either store rags or paper towels and fill the crankcase so the circlip doesn't fall into the lower finish.
xnationalwrench wrote:
The stock piston has a notch and then you tin can be able to remove the circlip past either a small needle nose pliers or something like a ...more than
xnationalwrench wrote:
The stock piston has a notch so you lot tin be able to remove the circlip by either a small needle nose pliers or something like a packing scribe. You might want to utilize either shop rags or newspaper towels and fill the crankcase and so the circlip doesn't fall into the lower cease.
Endeavor finding stock maico pistons. For a while y'all could get them off ebay simply they have dried up.
xnationalwrench wrote:
The stock piston has a notch and then yous can be able to remove the circlip by either a pocket-size needle nose pliers or something like a ...more
xnationalwrench wrote:
The stock piston has a notch so yous tin can exist able to remove the circlip past either a modest needle nose pliers or something like a packing scribe. You might want to utilise either shop rags or paper towels and fill up the crankcase so the circlip doesn't fall into the lower end.
unfortunately, my piston is a vintage Wiseco. The edges of the piston pin holes are not notched, only notches weren't needed back then - the clips it came with from Wiseco had dog-eared bent ends then yous could remove them easily with needle-nose pliers. The problem is having to use modernistic production clips in a vintage piston 
...continued adjacent postal service...
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lostboy819 wrote:
Attempt finding stock maico pistons. For a while you could become them off ebay but they have dried upwards.
lostboy819 wrote:
Try finding stock maico pistons. For a while you could get them off ebay simply they have dried upwardly.
yeah, I looked and in that location is no known Mahle piston of the size I needed available at any price.... they are just not there anymore, at least for the 400 radial. I was able to find one Mahle, but it was bigger than I wanted - it would have required wearisome out to my last available oversize when it wasn't otherwise necessary. I would have loved to practice my resto with a Mahle, but it just wasn't to exist 
The clearances on my top end with my old Wiseco (1st oversize) were splendid. All I needed was a prepare of new rings, as the finish gaps on my quondam ones was over limit. Thank you to John Caldwell for finding a brand new set of quondam Wiseco .020-over rings 
I have heard certain RM 400 Suzuki pistons are existence snatched up by the Maico guys. Supposed to exist the solution for the non -existent Mahles.
projection racer wrote:
I take heard sure RM 400 Suzuki pistons are being snatched upwards by the Maico guys. Supposed to be the solution for the non ...more
project racer wrote:
I have heard certain RM 400 Suzuki pistons are being snatched up past the Maico guys. Supposed to be the solution for the non -existent Mahles.
yep, at that place take been discussions almost that over on the yahoo group. I remember seeing discussions virtually using RM pistons in Magnum motors, but right offhand I don't recall having seen anyone talk nigh using them in the older motors. It would have been nice to notice a Mahle, but I am thankful my old Wiseco checked out ok. The bore was splendid, and then it got a light hone.
I got the top end on last night. Hopefully become a successful leakdown test washed within the next few days, and so cease out the primary drive, kickstarter, & magneto and get her into the chassis!
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NOS Mahle'southward for Maico's seemed to have stale up.
Bank check out Woosner Piston's, they do ane for my 440cc Magnum, sure they will have one listed for a 400cc Maico. Not bad quality.
I establish a nice tool years ago that looks similar an ice pick with a xc degree bend at the tip and a screwdriver handle. You can become the point nether the prune to raise it up enough to get a thin-bladed screwdriver under it to pop information technology out.
"If I recall how this worked, you lot'd put a side on, and so yous'd go and accept something to eat, and then you'd put another side on." … Mick Jagger
robkinuk wrote:
NOS Mahle'southward for Maico's seemed to have dried upwardly.
Check out Woosner Piston's, they do one for my 440cc Magnum, sure they will ...morerobkinuk wrote:
NOS Mahle's for Maico's seemed to have dried up.
Cheque out Woosner Piston'south, they exercise ane for my 440cc Magnum, sure they will have one listed for a 400cc Maico. Great quality.
thanks Rob yeah, if I get to the point of needing a new piston, I would most probable become with a Wossner.
Yous occasionally meet used Mahles on eBay, but I wouldn't spend more on an eBay piston than I'd be willing to throw away - I'd be hesitant to buy a used piston from a reputable dealer; no mode I'd buy one off eBay.
indy_maico wrote:
I found a nice tool years agone that looks like an ice option with a xc degree bend at the tip and a screwdriver handle. You can ...more
indy_maico wrote:
I found a nice tool years ago that looks like an ice option with a 90 degree curve at the tip and a screwdriver handle. You can get the betoken under the clip to raise it up enough to get a thin-bladed screwdriver under it to popular information technology out.
one of these?
cotter pin puller
I've actually got one of these in my tool box - it looks like if I sharpened the point on mine a bit, it might would have worked. If I e'er pull the piston again, I'll give information technology a try. Thanks for the tip!
Source: https://www.vitalmx.com/forums/Old-School-Moto,22/piston-pin-retainer-clip-removal,1091467
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