atc 110 engine help

[freak trike]

i have a 1980 atc 110...i think my engine is not the stock 1980...i think now i have a 82 83 engine..how i can make the difference.i say that because i want to change the spark plug ...i found a ngk br7hs...i think is not the right one..1980 need a d8ha and 1982 1983 dr8sh.my tread size is 14 mm .thanks.

[freak trike]

precision ngk d8ha for american model (12mm)
ngk dr8hs for canadian model (14mm)
DONT understand why previous owner try to use a ngk br7hs

[DohcBikes]

dr8hs is a 12mm plug.

dh8a is a 12mm plug.

Either will work for a stock 110.

If your 110 has an ngk br7hs, a 14mm plug in it, theres a chance it has been drilled and threaded bigger as a repair. In this case, your newly puchased plugs will not fit.

[freak trike]

yeah ...you right...now i put a br8hs whit 14 mm tread.i have some spark...i think is good.i check my timing points gap..but my 3 wheeler dont start.i think to low compression ...

[Vwrick69]

1980 110 is points and condenser, 1981 and newer CDI electronic ignition.

[freak trike]

yes my engine is the stock 1980 whit point and condenser..just my spark.plug hole was drilled and tread for 14mm.that why i was confused.

[DohcBikes]

yeah ...you right...now i put a br8hs whit 14 mm tread.i have some spark...i think is good.i check my timing points gap..but my 3 wheeler dont start.i think to low compression ...is the plug getting wet or is it bone dry? Do you have access to a compression gauge?

[freak trike]

plug wet ...i have to check my valve clearance beforebut if they are ok i will check the compression whit gauge.but if compression still low ...i think a have to rebuilt my top end