miss at 3.8K

[Bitsa (Ralph Wright - RIP)]

Billy
My k6 has 105 main jets and needle postion is fourth one down.According to a carb list off the sister site your carbs should be 657a,657b or 086a with these settings and air screw 1 turn out give or take a bit.The list I have is for the states, altitudes etc.
Cheers
Bitsa

[billy192]

Bitsa
i have ordered a set of115 and 120. i am going to try the 115 first and chop at 60-70 ish to see plugs. i have done everything else it has to be worth a try.

Billy

[billy192]

had the carbs off again and the clip was not in the centre as i first thought (reading glasses on) it was on the forth one down.
my plan, clip in the middle (done, what a pain) and fit the new 115 main. go for a run Friday next. fingers crossed.
I will take a plug spanner with me and chop at 4K and 5K to check
Billy

[billy192]

  great news, fitted the 120 main went out for a test ride runs great. i will still do a plug test at 60-70 to make sure but first impressions are its good.
thanks for all the advise
Billy

[Bitsa (Ralph Wright - RIP)]

Billy
Good for you forgot to ask standard air filter etc?
Looking forward to your plug colour with interest
Cheers
Bitsa

[billy192]

  went on a longer run and it seems when it get hot and you roll the throttle in top then open barrr barr miss miss then of it goes. not sure now what to do
Billy

[Green1]

Billy
What are your points like are they pattern or genuine.
Talking to my dad his old Ascona developed a miss when hot a bit like what your describing and after changing the points it still ran the same it turned out to be faulty condensers.It took a while to discover because faulty condensers normally take out the battery as well.


Mick   
 

[billy192]

both points and condensers are genuine Honda

its silly, up to the first 3-6 miles its great then as soon as you roll the throttle closed fast then try to pull away miss miss

i will get to the bottom of it
Billy

[Bitsa (Ralph Wright - RIP)]

Billy
Sounds rich to me as it is happy until running temperature.Its a bit like having the choke half on great when cold but crap when hot
Post a pic of your plugs mate.On the parts fiche the biggest main jet used was 110 and changed to 105 after a certain serial number.This is for the k4 model.So as regulations changed I am pretty sure the k6 was the same.
Cheers
Bitsa

[billy192]

just finished putting back to STD
 clip in the 2nd from bottom
105 main
points checked
new clips on rubber boots
new petrol pipe

test drive tomorrow with plug chop
Billy

[mick]

I'm following this thread to Billy as my bike is doing a similar thing, runs great for first few miles then starts acting up ?,

mine started as a flat spot as you rolled the throttle back on and stuttering at cruising speed on only a bit of throttle,

but ok when you wound it on,  I've adjusted the float heights which made a difference and jetted up to 115's which made it a lot better,

but still starts playing up after a few miles, I'm happy with float heights and fuel flow, mine starts easily without choke (Rich ?),

and I also noticed  no4 plug was sooty so I have swapped all the carb internals off no4 in to no1 to see if that plug goes sooty as it was ok ish before,

my next plan of attack is give it a longer run see how it performs and maybe try swapping condensers just to see if there's any difference ?, cheers Mick 

[UK Pete]

These 750 4's are very temperamental, and hard to diagnose problems
pete

[Bitsa (Ralph Wright - RIP)]

Mick
Does sound a bit rich.I start mine on full choke then within 10 seconds down to half then right off.It took me ages to get her to run properly mainly adjusting air screws a bit here a bit there.
If she pops out the back I found it to be those screws dont do it now
Hope this helps
Cheers
Bitsa

[mick]

I'll keep chipping away like Billy get there in the end I hope    cheers Mick.

[billy192]

Strange but good day to day. went to do my test run and went about 12 miles to tescos with her in doors on the back and sur enough it starts spluttering at 4K. i was miffed to say the least.

when pulling away from lights i took it to 7K in each gear and boom no miss, the min i roll the throttle back comes the miss.
when she was getting a few things i took off the overflow pipes to each float bowl, not sure why but I am at the point of tiring anything.

on the way home a went on a little de tour. i went through maisemore to the  M50 and down to a place called Newent which was 15 miles on the M50 and drove at a steady 60 -85 all the way down the M50.

brill. great runs sweet.
now i am going to go out with the tubes back on to see if it comes back.
Billy
not sure what difference these over flow pipes off make but hey its running goooooood