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


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  #11  
Old 10-19-2018, 08:27 AM
Jetster220 Jetster220 is offline
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I fouled one plug on my '18 in the 85 hours I've ridden it, an that was when I was still getting the jetting right and it was running to rich. Now it's perfect, no spooge and plug looks just right, running 93 pump and amsoil dominator at 44:1.


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  #12  
Old 10-20-2018, 05:35 AM
Cox76y Cox76y is offline
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Ive just been grabbing whatever the local shop has. Last pickup was the Motul 800. Hadnt googled it until you suggested that my oil could be part of the problem. Looks like a lot of people have had spooge n smoke problems with it. I have tried other oils but now, come to think of it the plugs are gunking up much quicker with this stuff. I might jump online and see if I can get some amsoil n Ill give it a try. Might solve part of the problem I was having with the smartcarb as well.. Think Ill still check the squish as well. Fingers crossed..
thanks everyone for the info.
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  #13  
Old 10-20-2018, 06:09 AM
ECRider ECRider is offline
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Quote:
Originally Posted by taylor146 View Post
Hi ECRIDER
Do you know what the comp was to start with and what they reduced it too?

thanks
Before head work compression was 155psi and afterwards 150 psi
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GG GP300 18
KTM 350EXC 17

GG EC 450, GG EC 250 08, KTM 525 EXC 06, KTM 400 EXC 01, XR400 97, VTR1000 98, VFR750 95, Husaberg FE400 96, RMX250 91, Maico 490 84, IT250J 81, RM250C2 79, Bultaco Alpina 250 77 - All sold
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  #14  
Old 10-20-2018, 05:18 PM
memphis2857 memphis2857 is offline
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Quote:
Originally Posted by ECRider View Post
Before head work compression was 155psi and afterwards 150 psi


That’s awfully low. Should be around 200.


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  #15  
Old 10-20-2018, 07:57 PM
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Jakobi Jakobi is offline
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Quote:
Originally Posted by memphis2857 View Post
That?s awfully low. Should be around 200.
Yes no yes. The number alone means sweet FA. Some 'quality' gauges use adapter fittings.. they can add a couple of cc's to the trapped volume which will in turn give a lower reading than the engine actually is. Even more so if the volume of the tubing is counted.

Comp readings mean verrry little unless a specific gauge is used to make comparisons.

My cheapo gauge always reads low, but my engines run strong and happy. I just work off percentages of compression loss along with piston blow by, coating wear, etc visible when peaking in the exhaust port... to help determine when a top end is due. Typically around 70hrs for me.
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  #16  
Old 10-21-2018, 06:16 PM
ECRider ECRider is offline
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I wouldn't be surprised if I lost 5 psi or so with my gauge as its a rubber cone push on type you have to jam on when doing the reading (ie not screw fitting).

Before I had the head done I tried reducing base gasket thickness to 0.15mm (0.5mm stock) & this raised the compression to about 160 psi & reduced squish to 1.35mm.

This made it a bit harder to kick, improved jetting & spooge, but power delivery was not what you call smooth with a big kick coming into the mid range. Fun but not fast (for me).
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KTM 350EXC 17

GG EC 450, GG EC 250 08, KTM 525 EXC 06, KTM 400 EXC 01, XR400 97, VTR1000 98, VFR750 95, Husaberg FE400 96, RMX250 91, Maico 490 84, IT250J 81, RM250C2 79, Bultaco Alpina 250 77 - All sold
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