8mm yam stroker lamy cylinders

M

Markoverall

Location
England
Looking for a bit of input , building up a 8mm lamy , and i am wondering about ignition setup with atp EPIC cdi will i have to change curves with a stroker from normal setup how much gain if so I havent got software package at moment, cheers guys
 
Harbor

Harbor

Location
Stockton
No you won’t need to change it, IF your running the same fuel, and the epic cdi, flywheel, stator and coil was running good on your prev engine, 701 or big bore or small Stroker.

I found the epic Hx3 to be sensitive and finicky on my Lamey.. ran like poo with aluminum charging flywheel.. ran normal with OE flywheel. Engine ran very well with a enhancer timing curve installed. I’ve tried many curves and lots of adjustments. The ignition doesn’t seem to administer the curve map well, starting timing is too much and lots of intermittent kick back on start up and couldn’t even fire a 16mil 1200 when an Msd enhancer could no problem…

if the ignition is new to you and you’ve not run it before? I’d run a stock cdi or Msd enhacer first and establish your engine runs well first..

Then switch to the epic ignition, that way if it runs poorly you’ll know what’s not causing the issue and shorten the chase my tail routine i went thru…

Chris and his wife at ATP were very helpful to me like mentioned above ^^
 
M

Markoverall

Location
England
Harbor said:
No you won’t need to change it, IF your running the same fuel, and the epic cdi, flywheel, stator and coil was running good on your prev engine, 701 or big bore or small Stroker.

I found the epic Hx3 to be sensitive and finicky on my Lamey.. ran like poo with aluminum charging flywheel.. ran normal with OE flywheel. Engine ran very well with a enhancer timing curve installed. I’ve tried many curves and lots of adjustments. The ignition doesn’t seem to administer the curve map well, starting timing is too much and lots of intermittent kick back on start up and couldn’t even fire a 16mil 1200 when an Msd enhancer could no problem…

if the ignition is new to you and you’ve not run it before? I’d run a stock cdi or Msd enhacer first and establish your engine runs well first..

Then switch to the epic ignition, that way if it runs poorly you’ll know what’s not causing the issue and shorten the chase my tail routine i went thru…

Chris and his wife at ATP were very helpful to me like mentioned above ^^
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Spot on cheers i have both versions of the charging epic and the hx3 is what i am running at the mo , it seems a little stronger , just weighing up what way i am going the lamys are the pv , need liners just wondering wether to use the 8mm or ss before i order or make liners, looks like the crank uses small pin kaw 750 rods ,hard to get quality ones . I would like to try and find out port heights on stroked liners and ss and availibility i think they are the dasa 7 port 85s , any input would be great
 
Harbor

Harbor

Location
Stockton
Mine are +8mil 5 port

this member tricky1 said he has sleeves and pistons still..little ways down the thread



Billet R&D Lamey Cyinder Piston question

Does anyone know what pistons are meant to be in an old R&D cylinder? Currently has 83mm flat top wiseco pistons but needs a bore. Could run 83.5 or 84mm anything bigger is getting too thin on the walls. What's the correct piston to be using?
www.x-h2o.com
 
W

waxhead

wannabe backflipper
Location
gold coast
Im not going to comment on the epic or atp ignition but the timing for all Yamaha ignitions is done of the stator. so no mater what stroke you have 20 degrees before tdc is still 20 degrees before tdc. The timing does not change
 
M

Markoverall

Location
England
waxhead said:
Im not going to comment on the epic or atp ignition but the timing for all Yamaha ignitions is done of the stator. so no mater what stroke you have 20 degrees before tdc is still 20 degrees before tdc. The timing does not change
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Epic or h3 are mappable from starting curve to limits, lots of different maps to suit compression stroke ect , just looking for feedback cheers
 
W

waxhead

wannabe backflipper
Location
gold coast
Markoverall said:
Epic or h3 are mappable from starting curve to limits, lots of different maps to suit compression stroke ect , just looking for feedback cheers
Click to expand...
You may have misunderstood the post i made. I know these are programable. however a stroker crank does not change this. degree before tdc is still the same the piston is just moving a larger distance
 
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