<![CDATA[crank noise]]>hey doing a rebuild now and i have the barrel off and when i spin it by hand it makes a grinding noise is this okay ? i think it should spin without any noise
https://imgur.com/gallery/PVuO4DT

]]>https://dt125r.co.uk/topic/3264/crank-noiseRSS for NodeThu, 15 Oct 2026 21:06:44 GMTTue, 02 Apr 2024 21:58:43 GMT60<![CDATA[Reply to crank noise on Fri, 05 Apr 2024 11:20:28 GMT]]>@erioni123

Like Callum said, use a flywheel puller to push the crank in and separate the cases. DO NOT use a screwdriver or chisel, please!…

A rubber mallet is usually enough for me…

]]>https://dt125r.co.uk/post/31941https://dt125r.co.uk/post/31941Fri, 05 Apr 2024 11:20:28 GMT<![CDATA[Reply to crank noise on Thu, 04 Apr 2024 17:47:10 GMT]]>@SpookDog its my first time splitting cases but im not sure if i will do it myself maybe i'll have someone do the rest of the work just to be safer, but i saw that people use case spliters its a tool made for spliting them

]]>https://dt125r.co.uk/post/31929https://dt125r.co.uk/post/31929Thu, 04 Apr 2024 17:47:10 GMT<![CDATA[Reply to crank noise on Thu, 04 Apr 2024 17:32:28 GMT]]>@erioni123

I don’t mean to offend.
Are you sure you’re up for this? Is this the first engine that you’ve worked on?
There are certain tools you need to dismantle the engine. Not to mention the damage you can do trying to remove bearings, even after you’ve successfully dismantled the casing…

]]>https://dt125r.co.uk/post/31928https://dt125r.co.uk/post/31928Thu, 04 Apr 2024 17:32:28 GMT<![CDATA[Reply to crank noise on Thu, 04 Apr 2024 11:52:00 GMT]]>There is a spot where the starter motor goes. And there is a piece up top near the inlet manifold.

It literally only needs a gentle tap.

The other good technique is just use the flywheel puller. These can be had on eBay for next to nothing and can even be made from scrap metal. It's well described in the Haynes.

]]>https://dt125r.co.uk/post/31927https://dt125r.co.uk/post/31927Thu, 04 Apr 2024 11:52:00 GMT<![CDATA[Reply to crank noise on Thu, 04 Apr 2024 11:46:01 GMT]]>@Calum how do you tap them apart like there is no place to hit it

]]>https://dt125r.co.uk/post/31926https://dt125r.co.uk/post/31926Thu, 04 Apr 2024 11:46:01 GMT<![CDATA[Reply to crank noise on Thu, 04 Apr 2024 10:22:33 GMT]]>Undo the bolts, dismantle the clutch/generator and then gently tap the casings apart. I use a rubber mallet.

]]>https://dt125r.co.uk/post/31925https://dt125r.co.uk/post/31925Thu, 04 Apr 2024 10:22:33 GMT<![CDATA[Reply to crank noise on Thu, 04 Apr 2024 10:13:15 GMT]]>@Calumhow do i split the case tho, the cank case how do i split it apart to change the bearings

]]>https://dt125r.co.uk/post/31924https://dt125r.co.uk/post/31924Thu, 04 Apr 2024 10:13:15 GMT<![CDATA[Reply to crank noise on Thu, 04 Apr 2024 09:52:08 GMT]]>I've never used a case splitter. What is a case splitter?

]]>https://dt125r.co.uk/post/31923https://dt125r.co.uk/post/31923Thu, 04 Apr 2024 09:52:08 GMT<![CDATA[Reply to crank noise on Thu, 04 Apr 2024 09:42:31 GMT]]>@Calum is there any way to split the cases without a case splitter as someone said that you can but i dont think you can

]]>https://dt125r.co.uk/post/31922https://dt125r.co.uk/post/31922Thu, 04 Apr 2024 09:42:31 GMT<![CDATA[Reply to crank noise on Wed, 03 Apr 2024 13:11:36 GMT]]>PJME is your friend. Make sure you get the right clearances as well. C3 IIRC.

Yamaha DT125R Crankshaft Main Bearing LH

Yamaha DT125R Crankshaft Main Bearing RH

I always replace all other gearbox bearings whilst you're there, but that's just me and my OCD.

]]>https://dt125r.co.uk/post/31919https://dt125r.co.uk/post/31919Wed, 03 Apr 2024 13:11:36 GMT<![CDATA[Reply to crank noise on Wed, 03 Apr 2024 11:43:24 GMT]]>@erioni123

They’re the ones to get. There is a type to get though, don’t get the ‘cs’ type (I think!)…

CRB023

These are the ones to get I think…

]]>https://dt125r.co.uk/post/31916https://dt125r.co.uk/post/31916Wed, 03 Apr 2024 11:43:24 GMT<![CDATA[Reply to crank noise on Wed, 03 Apr 2024 11:26:29 GMT]]>@SpookDog i see koyo main bearings the pop up a lot when i search on google are they any good

]]>https://dt125r.co.uk/post/31915https://dt125r.co.uk/post/31915Wed, 03 Apr 2024 11:26:29 GMT<![CDATA[Reply to crank noise on Wed, 03 Apr 2024 09:26:17 GMT]]>@erioni123

Ditto, definitely not. New main bearings and seals…

]]>https://dt125r.co.uk/post/31914https://dt125r.co.uk/post/31914Wed, 03 Apr 2024 09:26:17 GMT<![CDATA[Reply to crank noise on Wed, 03 Apr 2024 03:51:42 GMT]]>@erioni123 Hi. It's not ok,it should spin freely and noiseless. You have to check/replace crankshaft bearings and the bottom big end bearing. I would change them all to be in piece of mind.

]]>https://dt125r.co.uk/post/31913https://dt125r.co.uk/post/31913Wed, 03 Apr 2024 03:51:42 GMT