02-05-2024, 01:01 PM | #1 |
Join Date: Feb 2024
Posts: 20
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Valve clearence smc ram 170cc
Hi people I'm new here just looking for a bit of help. I got a smc ram 170cc atv and I'm just wondering does anyone know the valve clearence?
Struggling to get it started, It will try and start and get the odd back fire but that's about it. Any help would be appreciated thank you |
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02-05-2024, 01:43 PM | #2 |
Join Date: Sep 2014
Posts: 1,929
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Appears to have a CG engine so I would adjust them to .003" intake and .004" exhaust.
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02-05-2024, 02:05 PM | #3 |
Join Date: Feb 2024
Posts: 20
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Thank you I will try that and let you know if I can get it running. Appreciate your help
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02-07-2024, 07:24 AM | #4 |
Join Date: Feb 2024
Posts: 20
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Still can't get it to run with that valve clearence. I done a compression test as well and it about 76psi is that normal or low?
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02-07-2024, 08:28 AM | #5 |
Join Date: May 2018
Posts: 1,649
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Low
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02-07-2024, 03:49 PM | #6 |
Join Date: Sep 2014
Posts: 1,929
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Yes, definitely low. Easy engines to work on but I haven't seen a 170cc CG engine so parts may not be a common as for a 200 or 250.
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02-07-2024, 05:52 PM | #7 | |
Join Date: Feb 2024
Posts: 20
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Quote:
How can I tell if its definitely a cg engine? |
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02-07-2024, 08:29 PM | #8 |
Join Date: Nov 2019
Location: KY
Posts: 277
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CG engines are vertical. Cylinder nearly up and down. Overhead valves with internal cam. They will be in 125cc and larger, up to 275-300cc.
Qmb engines will normally be on the fully automatic models and are usually horizontal with no provisions for clutch or transmission attachment. Over head cam. They run straight into a variator (CVT). They are sized from 50cc up to 175-200cc. Most of the larger size designations are false with "200cc" being actual 165cc which is a 125-150 with a big bore kit. The cub type engines are overhead cam. They will be on many semiauto and automatics and are also adaptable for manual shifting. They are not usually in the larger sizes above 125-150cc but go as small as 50cc. Its a crap shoot with ATV engines and from what I have read none of them are as fast in an ATV as they are in a bike or scooter. I am sure there are exceptions, I just have not read about them.
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02-07-2024, 09:02 PM | #9 |
Join Date: May 2018
Posts: 1,649
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If it has a shifter ,the engine info should be on a little flat spot behind the shifter .
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02-08-2024, 04:14 AM | #10 | |
Join Date: Sep 2014
Posts: 1,929
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Quote:
Easiest way to identify a CG engine is to look at the left side of the cylinder. You'll see a round metal insert with a slot in it. That is the pivot pin for the cam followers. |
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02-08-2024, 08:11 AM | #11 |
Join Date: Feb 2024
Posts: 20
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You on about this?
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02-08-2024, 08:27 AM | #12 |
Join Date: Sep 2014
Posts: 1,929
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02-08-2024, 08:57 AM | #13 |
Join Date: Feb 2024
Posts: 20
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Yeh it's got that on it so it's definitely a cg170cc engine then
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02-08-2024, 12:54 PM | #14 |
Join Date: Sep 2014
Posts: 1,929
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If the piston and rings are good that leaves the valves or head gasket. When you had the head off did you try pouring gas into the upside down head to see if there was any leakage through the valves. One time I over oiled a foam air filter which caused a buildup of carbon on the back of the intake valve. A tiny flake of carbon came off and got stuck under the valve causing a loss of compression.
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02-08-2024, 02:06 PM | #15 | |
Join Date: Feb 2024
Posts: 20
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Quote:
I did find a smc ram 170cc manual online and the valve clearence in the manual says 0.05 in 0.05 out but I tried that and still won't start |
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