Husqvarna SM 125 - heat sieze - liner or coated cylinder?

[B5234FT]

Hi, Does anyone know if the SM 125 came equipped with a linered cylinder or a coated one (nikasil or similar) i.e can it be rebored?

Also, what sort of damage tends to follow a heat sieze in small bike engines? in a car engine it would generally be the piston(s) rings and block and the associated metal would make me suspicious of the rest of the engine...?

Cheers

[JBurrows88]

Did the bike burn through any/all of the oil?

Piston/rings, possibly even the (thing that the hold's the piston) the con-rod (which can be damage if the engine seizes).


Might be better to post this in "The Workshop"

Might also be easier to buy a new engine...

Give these guys a call, they have a supermarket sized warehouse full of engines/ exhausts and all sorts - Amazing fun to walk around.
https://www.dkmotorcycles.co.uk/
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Dave
XJR400 Kenney Roberts Paint Job

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Believe it's a DT125 engine, so have a look for some information on that.

[B5234FT]

Not sure on the exact circumstances, been told it siezed due to heat and now turns over freely.

Interesting if its the yamaha engine. I wondered if it might be the same as the WRE125?

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Ah, my bad - seems I've been mis-informed.
Maybe an older version used the DT engine, but it doesn't seem to quite match up for either SM or WRE; my apologies.

However, as far as I know it's a pretty toned down engine compared to the proper competition enduro bikes for the road ones

[stevo as b4]

I think the Husqvarna is all thier own engine, It was KTM who used to use Yamaha DTR engine's in their 125 trail bikes.

I have no idea if it has a Nicosil plated bore, but i expect it will have. It's basically a 26bhp version of their CR125 motocross engines though isn't it?

I know that some people have fitted the cylinder, head, and carb from the MX engines to them. Id say they were much more peaky and snappy than a full power Yamaha DT125 engine too, in the same way as an Aprilia MX/SX125 is.

[B5234FT]

Hmm, from what I can find barrels are about 200 and piston kits 75 and upwards. Just as long as thats all it is and its not done a rod/bearings/warped head or anything daft.

From what I gather 2 strokes seizing up is pretty common and normally repairable? In a car Id be changing out the whole engine but these dont seem to be all that plentiful....

[dangerousdave]

[delvey91]

Theres a place in weston super mare thats the best for coatings! Dont recall there name but thats ur best bet as they are coaed cylinders
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2016 Honda Africa Twin
2006 KTM 200 EXC

[B5234FT]

Cheers for the info guys. For better or worse I bought it, will know more once I've collected and stripped it. Sounds like a piston and a recoat for the barrel hopefully!

Does anyone know where I can get an engine manual for one of these? Found a pdf of the workshop manual for the basic bits on the bike but not torque values and suchlike.

Also, Does anyone know what jet diameters are commonly used when theyre derestricted?

Cheers

Edit: or in fact what the standard jets are?

[dangerousdave]

You didn't say which year the SM 125 was but this site has parts info for all years.

https://www.husqvarnaoutlet.com/parts_fiche

Here's a link to the '07 SM 125 parts info

https://docs.husqvarnaoutlet.com/parts//2007%20WRE-SMS%20125%20Parts.pdf

There's a choice of two jets on the parts fiche - presumably one is for the restricted version, one for the derestricted - 142, 165
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1988 Kawasaki KMX 200

Previous: Yamaha YZF1000, ZZR600, KMX200, DT50, KX80, CG125, PF50

[B5234FT]

Oops! It's a 2004 bike.

I found that doc outlet and got the parts listing but there didnt seem to be a manual with torques for engine fixings etc on there. Ive since downloaded the manuals for the CR and WR 125 of the same year, but I'm aware some bits are less common than others!

Cheers for the links and especially the jet sizes, it's got a DEP pipe, so 50:50 will be on the original jets and hence lean leading to the seizure!

[Supermotard37...]

Huskys,are there own engine,same with ktm who ever came up with they used dt engines,i can guarntee thats a load of bull honkey ive had a yamaha dt deresticted and ive rode a husky and the husky is alot faster,and i currently own a ktm 125 exc 01 and that thing is rapid for a little 125 haha!

There are a few good companys do repair nikasil,im. Currently bidding on a 2nd hand cylinder for my ktm as my ports got smashed to shit,try ebay you might get lucky and save you're self alot of money! But i can back fire and you'll end up with a already batterd cylinder ! Good luck!
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[stevo as b4]

KTM LC2 and Sting used Yamaha DT/TZR engines with electric start fitted. The KTM 125EXC/EXE is KTM's own engine, and probably almost the same engine as the SX125 models. They did do a rare restricted to 15bhp version of the EXE supermoto for a short time. I think the carb was smaller and the exhaust was different on these bikes.

[Supermotard37...]

I feel a lil thick now but thats good to know
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