Introduction and Quick Question - Valve Clearance Spec

[SprintNL]

SprintNL here, I've had a 1985 Honda ATC 110 for about 6 months and love riding it around. I live near a river/lake, with the cold this year its been a blast taking the trike out on the ice and sliding around. The only bad part about it is I'm finding myself wanting a bigger three wheeler!

Quick question - can someone tell me the valve clearance specs for a 85 ATC 110 and a 77 ATC 90? I have a service manual for both but wasn't able to find it in there.

[YTZ drew]

ATC110= 0.003" intake & exhaust(0.07mm)
ATC90= 0.002" intake & exhaust(0.05mm)
"T" mark on rotor is for TDC, make sure engine is cold and both valves are closed (TDC compression)
and a little too loose is better than a little too tight!

and by the way, welcome!

[webbch]

How many set with feeler gauges? I don't have a wealth of experience doing it, but I set it by feel, right or wrong. If you can wiggle the rocker arm up and down and make a good tapping sound, it's too loose. If you can't wiggle the rocker arm at all, too tight. Somewhere in between is "just right"...

[tri again]

Manual says to be sure it's on TDC to adjust valves,
not just when they go slack.
New question:
do valves tend to go loose or tight after time/heat?
We rarely see burnt valves on here.

[YTZ drew]

I have seen a few Honda CT90's that were too tight, also a few Suzuki LT230's that were so tight they wouldn't start, and a KLX125 that was just tight enough to start, but pop back through the carb when hot. As they say, your mileage may vary....

[barnett468]

Hello SprintNL;


The orig manual below says .05mm or .002" for both the 90 and 110 on page 71. .003" is close enough, looser is better than tighter. :wondering

http://www.oscarmayer.net/atc/manuals/honda/atc90_73-78_atc110_79-81_servicemanual.pdf

[kb0nly]

I don't generally use a feeler gauge either, sometimes i will just to see if they are truly out of whack, but generally i do the wiggle and noise test and adjust them to my liking. Not scientific i know, but i have adjust them with the feeler gauge and they still seem too noisy and then i do it by feel and sound and they are just about perfect. Its hard to get a feeler gauge to sit in there just right.

[webbch]

You need to get the "feel" of it, so you can dispense with using a "feeler" gauge apparently :)
Yeah, I should've mentioned in my previous post that I DO set the engine to TDC before adjusting....I just don't use a feeler gauge when I make the adjustments.