YM 1700 hard starting

[B man]

Pulled the head again looked closer at the valves, they’re not seating completely(yep, shoulda done it earlier but been in a hurry) ain’t no big deal. I really appreciate all yall’s input, this is a great site.

 

[careyo63]

Hard to be for sure but that was my guess. Now Find out Why and hope it can be corrected easily and finish it up. Would I reuse the old H-Gasket? "NO". Maybe to get it running and then replace it with a new one and then you should be good to go :2cents:

 

[Jtullis13]

Glad you confirmed the valves weren't seating. At least now you have a new starting point. Hopefully it is an easy fix and nothing major. As Carey said, I would not use the old head gasket either, they are cheap, just get a new one that way if something isn't working properly you won't have to wonder if the head gasket is bad at that point.

 

[B man]

Should’ve checked the first time off, just got in a hurry to get it running. Thx.

 

[clemsonfor]

I would not use the old gasket either...Unless I was in a hurry to use it. But I'd buy a new one expecting when slow to replace it or not be angry if it let go or whatever knowing it was used.

 

[B man]

Worked the valves over, the head was a mess once I got them out. What is the spacing between the rocker arm and valve supposed to be? I know they need to be readjusted.

 

[B man]

It runs, finally!

 

[careyo63]

:thumbsup:I could imagine that head was in bad shape. I was guessing it had ring problems. And the ether was my reasoning. Just keep I mind about the gasket and if it's worth replacing it. I would..

 

[B man]

Never seen a head in this bad of shape, lots of corrosion on the back cylinder combustion chamber. Already have a new head gasket on the way. Thanks to all you guys on the forum.

 

[California]

Never seen a head in this bad of shape, lots of corrosion on the back cylinder combustion chamber. Already have a new head gasket on the way. Thanks to all you guys on the forum.

Could that be a cracked head with a water leak?

 

[B man]

Didn’t see any, but probably would if I had it Magnafluxed. The original head gasket was badly broken.

 

[kenmac]

so, you are saying it runs ? Did you get the answer about the valve adjustment ?
I see where you asked and no one responded. I can look it up if you need it

 

[California]

YM195 (YM1700) Operation Manual: Valve clearance 0.006", both intake and exhaust.

Same clearance for YM240 (YM2000).

 

[B man]

Yes Ken, it runs. Got the specs online, thanks Cal. Thanks everyone for the ideas, introspection and head scratching.

 

[kenmac]

it just puzzles me as to why you couldn't see all of this when you had the head off the first time :confused3:

 

[B man]

They looked alright till I got a spring compressor, then down hill from there.

 

[Jtullis13]

Glad you got it running! Those things can be a pain to figure out