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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.


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  #71  
Old 01-29-2023, 10:39 AM
riton63 riton63 is offline
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Hello my 300 ec 2018 had the same problem at 27h. Ignition side bearing broken. Then at 6500km the 2 rusty crankshaft bearings and now at 12000km too. I had changed the cylinder head in the meantime so for me the cause is cylinder or hot porous casings. It must be very low because I have never added coolant. I've been riding motorcycles for 40 years and this is the first time it's happened to me. In fact, this only happens on the 300. I use NTN steel cage bearings. I will try to put a lower radiator cap 1.4bar. I'll keep you informed. French rider.


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  #72  
Old 01-30-2023, 10:04 AM
5valve 5valve is offline
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At 65 to 67 hrs I've done 5 hones, had whole engine apart 2 times, changed 2 pistons, 2 crank bearing sets, con rod replacement.

Issue was too high compression from factory, at 15.4:1. It took long to realize, since air pressure gauge showed ok compression.

Fluid measurement went off the charts.

I have now deepened the head significantly and use 1mm base gasket (2x 0.5).

Finally, kick starter or electric have no struggles. Power is in abundance still. Somewhere in high 12:1 to low 13:1 compression now.

I did purchase and measure another GP head, and it was again same abnormal compression.
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  #73  
Old 01-30-2023, 11:08 AM
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SS109 SS109 is offline
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Too high compression... hmm... interesting. Could this be the source of a lot of the Gas/Rieju issues?
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  #74  
Old 01-30-2023, 11:32 AM
5valve 5valve is offline
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Most certainly. I was struggling with vertical lines in nikasil. Most probably due to high compression forcing rings outwards too much.

Slovak tuner who bumps up compession for max performance on a 250, uses 14:1 and high octane fuel. And 250 can handle more than 300.
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  #75  
Old 08-31-2023, 10:59 PM
Jay Dizzle Jay Dizzle is offline
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My 2018 XC300 just had the ignition side/ left side main bearing fail. It scored up the bearing race pretty good and am now thinking i need to get a new left side case. Did you guys have any damage to the case after the bearing failed? Also looking for a used 2018 xc300 left side case now.
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  #76  
Old 12-30-2023, 01:33 PM
riton63 riton63 is offline
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Default hs bearings and connecting rod for the fourth time

Hello guy. Still the crankshaft bearings hs and also the connecting rod 2000km later. Now i have 14450km and 413 h. I love this bike but it's starting to get expensive.
I'm having them all repaired. I will check the compression. Fellow motorcyclists also have bearing problems on BETA, SHERCO (gearbox), KTM, HUSQVARNA, NEW GASGAS (piston worn out quickly) Motorcycles are more and more expensive and have more and more problems. The bikes are good but not as reliable as they were 20 years ago. Happy New Year 2024 anyway. A french rider.
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