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Old 07-08-2013, 01:15 PM   #16
grumpyman OP
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Joined: Jan 2011
Oddometer: 76
thanx again

using a motorcycle i have a guaranteed -20min commute from oakland to san fran using hov lanes and my parking costs are $7 per day.
a car can't touch that.
as long as i am not doing a top end every year i am happy with that
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Old 07-08-2013, 01:40 PM   #17
clintnz
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Joined: May 2004
Location: Rotoiti, New Zealand
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What they said. I usually start mine up while I'm putting my gear on, a minute or 3 warmup, & my motor has lasted well.

Quote:
Originally Posted by grumpyman View Post
using a motorcycle i have a guaranteed -20min commute from oakland to san fran using hov lanes and my parking costs are $7 per day.
a car can't touch that.
as long as i am not doing a top end every year i am happy with that
Plan on a water pump service plus cam bearing & cam follower bearing replacement at 25K miles. With that done my top end lasted 60K miles Have fun!

Cheers
Clint
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Old 07-08-2013, 10:21 PM   #18
bmwktmbill
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Joined: Jul 2005
Location: Traveler
Oddometer: 4,765
Forgot to mention...

17/42 gearing.

Brings the revs down but works with stock chain length.

Big difference in the feel of the ride.

OEM is 16/42.
bill
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'02 KTM 640 Adventure-lowered
"On the road there are no special cases."
Cormack McCarthy-The Crossing

The faster it goes the faster it breaks.
And high performance=high maintenance.
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Old 07-14-2013, 08:49 PM   #19
grumpyman OP
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currently at 16/42

i do have a 17 sitting in the shed
i just did 500 miles of asphalt behind mostly 950's and big bmw's
i did wonder if the 17 would have given me that extra 8-10 mph to comfortably stay on them on the flat sections
was also running a tkc80 front and mefo rear
have changed out to scorp front for commute/long asphalt rides
wondering about the mefo super vs a scorp in rear as they look sim but the mefo is sposed to be harder

i am keeping the dirt tires as the 640 also does dirt duty on our 650 dirt rides and it came with 908's front/rear
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Old 07-14-2013, 09:20 PM   #20
bmwktmbill
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Quote:
Originally Posted by grumpyman View Post
i do have a 17 sitting in the shed
i just did 500 miles of asphalt behind mostly 950's and big bmw's
i did wonder if the 17 would have given me that extra 8-10 mph to comfortably stay on them on the flat sections
was also running a tkc80 front and mefo rear
have changed out to scorp front for commute/long asphalt rides
wondering about the mefo super vs a scorp in rear as they look sim but the mefo is sposed to be harder

i am keeping the dirt tires as the 640 also does dirt duty on our 650 dirt rides and it came with 908's front/rear
The 17T will help within the limitations of the missing 6th gear.

I use Kenda 270's for everything these days. The largest rear tire is smaller diameter than OEM and that also raises the overall gearing IMHO.
bill
__________________
'02 KTM 640 Adventure-lowered
"On the road there are no special cases."
Cormack McCarthy-The Crossing

The faster it goes the faster it breaks.
And high performance=high maintenance.
Bill Shockley
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Old 07-18-2013, 12:52 PM   #21
grumpyman OP
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tried the index so i thought i'd try here too

hopefully someone up in the b/trust sees this
my buddy g/friend "helpfully" pointed out my disc lock today and bammo i have now hit the thing twice this eve
upon rolling home from the last one a full takeoff to wreck on right side i find my 640 seems to die upon hard front braking.
i have had a couple hints of this before but now it's bad
as i see it my options are wait for whatever got in the wrong place to drain out and all will be better in morn
i set my float as per motolab rec's and i think he's on the low side of things
allthough he says i am 5 hp less than a similarly set up 640 which seem like a bit lame allthough it runs fine

i turned up the idle and will test tomorrow and see how it goes

rolled around this am an it still dies upon har front braking
it does not die so much as it just starts "chugging" which i can ocaisionally cure by puling in choke more and tweeking the throttle until idle sounds regular

up to now this bike has been great "aside from being so high"

any ideas i am about to send it off to the shop and that always sucks
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Old 07-18-2013, 10:12 PM   #22
bmwktmbill
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Grump,
I think the common wisdom is to check the ignition switch for pulled wires...others may have another suggestion.
bill
__________________
'02 KTM 640 Adventure-lowered
"On the road there are no special cases."
Cormack McCarthy-The Crossing

The faster it goes the faster it breaks.
And high performance=high maintenance.
Bill Shockley
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Old 07-19-2013, 05:53 AM   #23
meat popsicle
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Quote:
Originally Posted by grumpyman View Post
hopefully someone up in the b/trust sees this
my buddy g/friend "helpfully" pointed out my disc lock today and bammo i have now hit the thing twice this eve
upon rolling home from the last one a full takeoff to wreck on right side i find my 640 seems to die upon hard front braking.
i have had a couple hints of this before but now it's bad
as i see it my options are wait for whatever got in the wrong place to drain out and all will be better in morn
i set my float as per motolab rec's and i think he's on the low side of things
allthough he says i am 5 hp less than a similarly set up 640 which seem like a bit lame allthough it runs fine

i turned up the idle and will test tomorrow and see how it goes

rolled around this am an it still dies upon har front braking
it does not die so much as it just starts "chugging" which i can ocaisionally cure by puling in choke more and tweeking the throttle until idle sounds regular

up to now this bike has been great "aside from being so high"

any ideas i am about to send it off to the shop and that always sucks
If your float height is good, and your carb is clean, you should have adequate fuel pressure at the jets for hard braking. One other thing is you may have worn carb parts (time for a rebuild?), but with the scenario you said I'm wondering if you disloged some gunk and its now sloshing around intermittently clogging a jet under hard braking. I disloged some gunk from my tank (dirty gas I guess), which was obvious when I serviced the petcock.
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Old 07-20-2013, 02:22 AM   #24
grumpyman OP
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Joined: Jan 2011
Oddometer: 76
checked in with motolab

his float height is 16.7 compared to 14.7 stock
i have done creeper's carb filter setup so maybe one of the filters got full of gas and was causing some issue ???
ran it hard (little bit of wfo and the iffy running isue have gone away)today and did some severe front braking without the chugging and dying i had yesterday
motolab is saying i am down 5hp compared to a similar 640 and we are going to do a leak down test and see if that says the exhaust valves are crap from factory. he suspects those cause of high o2 levels (i think i am quoting him right)
i do know the po ran way rich pilot jetting for his elevation and ktm has issues with doing there valve seats right

question for the brain trust (creeper,meat pop,bmwbill)
if i find crap ex valves whats the $$ diff on doing those or just doing whole top end ???? i do know the top of pistons looked a little cruddy when i looked in with the plug out... wether that has burned of with a rejet and some hard riding will need to be checked out next time i pull the tank maybe to try that rocker leak fix with the slug screw

i did like the service i got from thumper racing on my 520 but if i can put that off for 20'000 miles i can deal with 5 hp loss as long as that doesn't lead to major failure .... can i get the valves redone for less than a full top end job ?????
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Old 07-20-2013, 02:57 PM   #25
bmwktmbill
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Grump,
How many miles on the machine?

The damage may be a broken piston ring.

Any oil in the airbox?

bill
__________________
'02 KTM 640 Adventure-lowered
"On the road there are no special cases."
Cormack McCarthy-The Crossing

The faster it goes the faster it breaks.
And high performance=high maintenance.
Bill Shockley
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Old 07-27-2013, 03:07 PM   #26
grumpyman OP
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Joined: Jan 2011
Oddometer: 76
5700 miles and well kept

i learned my lesson the hard way about buying a non clean ktm
am i looking for oil that has pushed back through the filter or is there another way in??
broken piston ring could lead to severe failure yes?
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Old 07-27-2013, 10:48 PM   #27
bmwktmbill
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Poor leakdown could be bad valves or rings or both?

To me oil in the airbox would be worn guides or seals or both.

When I had my head done, black oil in my airbox went away.

bill
__________________
'02 KTM 640 Adventure-lowered
"On the road there are no special cases."
Cormack McCarthy-The Crossing

The faster it goes the faster it breaks.
And high performance=high maintenance.
Bill Shockley
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