cawteracing
Registered user
Hi all,
trying to get to the bottom of the poor running issue of my r100gs. It’s got 50 thousand miles on the clock , believed to be genuine.
A few years ago I had the heads overhauled . New valves, springs and valve guides…. Also had new rings . (3500 miles since rebuild)The carbs have been cleaned and rebuilt with new jets and diaphragms.. carbs are synced, valves are the correct clearance. New carb inlet rubbers..! Also the timing is spot on.
The problem I’m having is it’s awful at idol.. air mixture screw has to be at least 31/4 turns out.. it pops as if it’s so lean . The plugs show lean running too. On over run it’s popping .. it rides ok on the throttle and pulls quite well.
I had a compression test done last week and it was 80-85 psi.. it doesn’t smoke and starts well . With all the work that’s been done how could it be down on compression? Starts first time every time. What am I missing??
Oh and finally I fitted the motorworks Emerald Isle ignition system… could this be the cause?
In the next few days I’m going to fit the original Bmw ignition back on just rule it out. So frustrating. I’ve even spoken to motorworks to asked if they knew what could be the problem? They were stumped and wished me good luck in finding the problem.Many thanks in advance for and suggestions.
Sent from my iPhone using Tapatalk
trying to get to the bottom of the poor running issue of my r100gs. It’s got 50 thousand miles on the clock , believed to be genuine.
A few years ago I had the heads overhauled . New valves, springs and valve guides…. Also had new rings . (3500 miles since rebuild)The carbs have been cleaned and rebuilt with new jets and diaphragms.. carbs are synced, valves are the correct clearance. New carb inlet rubbers..! Also the timing is spot on.
The problem I’m having is it’s awful at idol.. air mixture screw has to be at least 31/4 turns out.. it pops as if it’s so lean . The plugs show lean running too. On over run it’s popping .. it rides ok on the throttle and pulls quite well.
I had a compression test done last week and it was 80-85 psi.. it doesn’t smoke and starts well . With all the work that’s been done how could it be down on compression? Starts first time every time. What am I missing??
Oh and finally I fitted the motorworks Emerald Isle ignition system… could this be the cause?
In the next few days I’m going to fit the original Bmw ignition back on just rule it out. So frustrating. I’ve even spoken to motorworks to asked if they knew what could be the problem? They were stumped and wished me good luck in finding the problem.Many thanks in advance for and suggestions.
Sent from my iPhone using Tapatalk
