Cheap Cylinders

[Oisin]

Re: Cylinder questions
Hey guys I am I need of a new cylinder for my 2005 Dtr 125 and I’m just wondering if any of ye have had any experience with cheaper cylinders that are in the market like the ones below. Thanks

https://www.ebay.ie/itm/194027880193

https://www.ebay.ie/itm/234003665601

€ 130,81 9％ Off | Cylinder 56.4mm Piston Ring Kit For Yamaha DT125 TZR125 LC125 RE125 R125 RR125 BELGRADA TDR125 3BN piston 2YK-11631-04-35
https://a.aliexpress.com/_mKgVFpf

[Calum]

Wow, yeah no.

Just get an OEM barrel.

Athena make good stuff too.

[Oisin]

@calum

Why what would be wrong with these ones ¿
Where would I get a reasonably priced Athena one

[Calum]

@oisin Why are you cheaping out on the heart of your motorcycle.

Firstly, tolerances. China aren't known for the QC's.

Are the bores correctly honed, are the ports chamferred.

Secondly 3BN is a larger bore requiring a shorting stroke.

Fitting a genuine 3BN barrel to your 3MB will result in the piston fouling the head. Which would be disastrous.

I got a brand new 170 Athena kit for under £400.

But Athena also do a 125.

https://www.pjme.co.uk/acatalog/Yamaha-DT125R-Cylinder-Kit-5689.html#SID=98

[declan]

@oisin I'm a fan of Chinese stuff, but you say cheap you can get a genuine cylinder way cheaper off ebay either already in good condition or get a bad one even cheaper and get it rebored makes way more sense imo

[Oisin]

Yea I should probably look at getting a proper one.

[SpookDog]

@oisin

Definitely!
Please!

[Calum]

Genuine barrel:
https://www.ebay.co.uk/itm/294163421645?_trkparms=ispr%3D1&hash=item447d8199cd:g:KyUAAOSwEzxglGAu&amdata=enc%3AAQAFAAACgBaobrjLl8XobRIiIML1V4Imu%252Fn%252BzU5L90Z278x5ickkvjzWOStkxwnlDuxSI1PVVn2jedjJZpYtGYVED0h1pW9Hb6vmfEkWRpvjAPkG%252FPoHbXLDocJb9rr%252F%252FGom1ahd1HXp2iEpkYr%252BG4SPFnUPIYsf5Un3FYs8Tip%252Bg94frZvCkU9BDLVsgHLyCd%252BJD2YF6nHw5SH8%252FKhU0d6HBOxDf3c9pY8HOmA5MojfS42bIi%252FIdQWzPMeXeJN5OQL9sIutNZsfY1EnHPK4aLjZcjrVGdnUywtGlMiM4GAZ31NWXtTkHodvQRZahOgMVXApmeF2PJkdH8KJ4WTj7U%252B6Z6m0j9H7xsBFcU7%252BdFHtrBXGEwYwzxDUR7PMzlP8WOpEjSK57FIYMGoTJvTCL47NckQvj5Y0xEgoxwn9NIXpVvogvtUWGOsg60ofMZXYEnyI8xZaBU%252FMg9D72IUaJ0zsNtJwBnKsDRuZFAog%252B5gNsguWhmoMvpdqSt7vfFvP3TIXb4TEHYfpOrUQ6ZRPXlVkvUur1yYF8Smq%252Fw%252BnPGFi5fKJaaRDwcUKTr8uz%252F1DMBgKMbVWCepgiIkR9Em5X7qiPtsYv%252BtU7d2UhImom8MQxVc2Ecgcx%252FgjlaqBLa1c5fHYSLxsTql53wDPbSZFFCrbHy%252FpuSOjLg9dcSqG9lZ9j9Qcfm5C3AJWHXnuF7ABXDrOSd4%252Fz%252FXxRnyRvnyDjIo0FQZrBcDk%252BculPUhe%252FGIzOa1EqvKBZL24ifdPE9bXzJnzAtyPWVsdArfgSobns%252BxqrpygbIfUyHGN73nu%252FdXy9wWiD5oUUEN8JIO0OlaGgjjE5sJGRLnTg8hJFZPYn5FmEdtMypw%253D|cksum%3A2941634216456d45bf51623a4d568147b0c69a7f5aeb|ampid%3APL_CLK|clp%3A2334524

£25

https://www.ebay.co.uk/itm/164718558256?hash=item2659fdbc30:g:m-IAAOSwDWVgNC-R

£45

Both need a rebore £35 inc VAT.

[theportingmaster]

@Oisin Have a 3MB00 barrel with a 56.75mm Bore Namura Piston Kit just been bored & honed at Mick Abbey Tuning. still at Micks buf will be picking up this week, pm me if want it and will
upload some photos. cheers Terry

[Oisin]

@theportingmaster
Yea please send on some pics and how much u looking for

[Oisin]

@calum
Thanks I really appreciate it. If I get rebore would I have to get new piston and if so what size

[Calum]

@oisin When you rebore you need a larger piston. The piston should be supplied at time of rebore to ensure tolerances are matched. The borer will advise what piston to go with.

Once you go to a certain bore size, the powervalve must be modifed to avoid fouling the piston.

[theportingmaster]

@Oisin The cylinder has been rebored and honed with a quality
Namura piston kit, comes complete with modified powervalve and a brand new Japanese little end bearing. Has been re-painted in VHT met silver. £200 plus delivery
cheers Terry

[Oisin]

@theportingmaster
That would be great. Could I get your email or contact info so that we could organise payment and and some pictures

[theportingmaster]

@oisin Here a some pictures of the parts, have given you a set of Carbon Fibre Reeds for free. If you give me your email will send lots of high resolution photos of the parts as don't know how to add images here properly.
(https://hosting.photobucket.com/images/i/portingmaster/1.jpg?width=450&height=278&crop=fill)
https://hosting.photobucket.com/images/i/portingmaster/2.jpg?width=450&height=278&crop=fill)

[Calum]

[Oisin]

@theportingmaster
My email is mcgilloisin@gmail.com I appreciate it thank you.

[Oisin]

Hey
I’m looking to get the bike up and running again for the summer and I’m wondering if anyone is selling a cylinder for a 2005 Dt125. Ideally with piston and pv, all good to go.
Thanks guys
Oisín