PICKUP COIL OHMS

RGH · #1 PostAuthor: **RGH** » Mon Jan 28, 2013 9:53 am

Have 2 problems slowly creep in on my Z1R 1980 D3 in the last week.

First up, started being a real caint when cold, starts and runs fine till you move off, need 1/2 choke for about a 30 seconds then it's fine, never done this before, runs sweat as (as always in the past).

Secondly when hot (we are in a hot summer over here) will back fire when throttle closed when travelling, never done this before.

In the past 18 months has float level, ignition coils, ignitor box, colour tune, carb balance, cam chain tension, plugs all checked. New carb inlet rubbers 12 months back, no leaks in this area.

Problem only started last week. Changed out the spark plugs, no change.

Which brings me my 2 questions.

The Clymer manual states the pickup coil harness end wires (black/blue and Yellow/red) need resistance readings between 400-500ohms, the Kawa factory manual states 360-540, Is the Kawa one correct? I thinks so.

My readings are- COLD 460ohms When HOT 540ohms for both coils. Do the ohms readings change when HOT?, I would say no?

If my pickup coils are stuffed going by these readings, surpose Dyna-S ign and ign coils are the go? Where do you guys buy yours?

Thankz in advance.

#2 PostAuthor: **KeithZ1R** » Mon Jan 28, 2013 11:00 am

Simply put Heat = resistance ........resistance = heat, bit of a vicous circle really :cry:

I would be looking elsewhwere as Hall effect pickups have two states working or not

unless somebody has any better suggestions

hillbilly · #3 PostAuthor: **hillbilly** » Mon Jan 28, 2013 12:15 pm

Try your inlet rubbers.sounds like its them .

StephenW · #4 PostAuthor: **StephenW** » Mon Jan 28, 2013 5:45 pm

Agree With Hillbilly
I had the same trouble with my Z1R, found to be the carb to head rubbers were cracked. Installed a new set and good as new.

Mark Tiller · #5 PostAuthor: **Mark Tiller** » Mon Jan 28, 2013 5:49 pm

KeithZ1R wrote:Simply put Heat = resistance ........resistance = heat

Absolutely correct, electrical resistance rises as heat rises

PAULJAC47 · #6 PostAuthor: **PAULJAC47** » Mon Jan 28, 2013 6:26 pm

Poor cold starting can be an indication of tight shim clearances check these before you go any further!!

RGH · #7 PostAuthor: **RGH** » Mon Feb 04, 2013 2:02 pm

That all for your help.

Finally had time for a look, turned out to be some crud in the pilot jet which is rather strange as tank, carbs, tap and filter as always clean as a whistle, learn sumthink every day.

Quick squirt with carb cleaner and blow job with compression = sorted.

#8 PostAuthor: **KeithZ1R** » Mon Feb 04, 2013 4:46 pm

The cheapest fixes are ALWAYS the best :up

PICKUP COIL OHMS

PICKUP COIL OHMS

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