Retorqued heads and bikes now running awful - The Jockey Journal Board

Go Back   The Jockey Journal Board > General Discussion > The Board

Reply
 
Thread Tools Search this Thread Display Modes
Old 09-12-2020, 02:03 PM   #1
rhysmort
Senior Member
 
rhysmort's Avatar
 
Join Date: Jan 2016
Location: UK
Posts: 1,653
Default Retorqued heads and bikes now running awful

Evening all!

After my ride last weekend it was time to tighten everything. I retorqued the heads, front was good, rear needed a little more.

Now, upon doing this, and since I did the bike is idling really rough, coughing through the carb etc. The bike revs and picks up freely but idles terribly?

I'm really stumped. 3 of the bolts torqued down and it's gone from running superbly to terribly.

Any input welcome!
__________________
King or street sweeper, everbody dances with the grim reaper.
rhysmort is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 09-13-2020, 01:58 AM   #2
dbkp
Senior Member
 
dbkp's Avatar
 
Join Date: Feb 2008
Location: montana
Posts: 800
Default Re: Retorqued heads and bikes now running awful

I don't know how much torqueing you did, but years ago I had this issue, and ended up re adjusting the pushrods.
__________________
" And there was Old Sneep, sucking on a lemon"
dbkp is offline   Reply With Quote
Old 09-13-2020, 03:43 AM   #3
Thunderbird
Senior Member
 
Join Date: Apr 2017
Location: 7th Stone
Posts: 267
Default Re: Retorqued heads and bikes now running awful

push rods, disturbed inlet manifold.
Thunderbird is offline   Reply With Quote
 
Old 09-13-2020, 03:47 AM   #4
rhysmort
Senior Member
 
rhysmort's Avatar
 
Join Date: Jan 2016
Location: UK
Posts: 1,653
Default Re: Retorqued heads and bikes now running awful

DB!

I hadn't thought about that, could be theyy're a little tight!
__________________
King or street sweeper, everbody dances with the grim reaper.
rhysmort is offline   Reply With Quote
Old 09-14-2020, 04:17 PM   #5
Jockeyshift41
Junior Member
 
Jockeyshift41's Avatar
 
Join Date: May 2020
Location: Florida
Posts: 9
Default Re: Retorqued heads and bikes now running awful

Anytime I re torque heads and cylinders, if I get movement, I check and adjust pushrods/tappets. I also use a o ring intake from a pan with adapters and check the clamps often.
__________________
Al SuicideShift : separates the men from the boys
Jockeyshift41 is offline   Reply With Quote
Old 09-14-2020, 05:21 PM   #6
rhysmort
Senior Member
 
rhysmort's Avatar
 
Join Date: Jan 2016
Location: UK
Posts: 1,653
Default Re: Retorqued heads and bikes now running awful

Quote:
Originally Posted by Jockeyshift41 View Post
Anytime I re torque heads and cylinders, if I get movement, I check and adjust pushrods/tappets. I also use a o ring intake from a pan with adapters and check the clamps often.
Thanks for the input man! yeah I checked pushrods, all real good. I gave the plumber nuts a tiny pinch up and it's running like a champ again!
__________________
King or street sweeper, everbody dances with the grim reaper.
rhysmort is offline   Reply With Quote
Old 09-14-2020, 11:51 PM   #7
Stormin
Senior Member
 
Stormin's Avatar
 
Join Date: Apr 2017
Location: near Edmonton, AB
Posts: 144
Default Re: Retorqued heads and bikes now running awful

Wow, it surprises me how sensitive the knucklehead is to small changes!
Stormin is offline   Reply With Quote
Old 09-15-2020, 04:43 AM   #8
rhysmort
Senior Member
 
rhysmort's Avatar
 
Join Date: Jan 2016
Location: UK
Posts: 1,653
Default Re: Retorqued heads and bikes now running awful

Quote:
Originally Posted by Stormin View Post
Wow, it surprises me how sensitive the knucklehead is to small changes!
Yeah, it's a real sensitive soul. It's the same with carb adjustment as well.

My flatty, you could get it to run well on varied settings if you wanted to fart about with it. I caught the HS needle on this M35 with my hand putting my fuel on and moved 5? clicks maybe richer, bike was running like I'd put diesel in it.

Of course, It's why a lot of folks put an M74B on them, with the fixed jet it's less precious.
__________________
King or street sweeper, everbody dances with the grim reaper.
rhysmort is offline   Reply With Quote
Old 09-15-2020, 05:19 AM   #9
magnum45pete
Senior Member
 
magnum45pete's Avatar
 
Join Date: Jan 2013
Location: Brighton England
Posts: 1,649
Default Re: Retorqued heads and bikes now running awful

At least you've stopped calling it 'she' ....
magnum45pete is offline   Reply With Quote
Old 09-15-2020, 05:52 AM   #10
rhysmort
Senior Member
 
rhysmort's Avatar
 
Join Date: Jan 2016
Location: UK
Posts: 1,653
Default Re: Retorqued heads and bikes now running awful

Quote:
Originally Posted by magnum45pete View Post
At least you've stopped calling it 'she' ....
Haha! what's wrong with that!??

The bikes name is 'Snake Charmer' but if I referred to "HER" as that people would frown!!
__________________
King or street sweeper, everbody dances with the grim reaper.
rhysmort is offline   Reply With Quote
Old 09-15-2020, 11:57 AM   #11
JasonMcElroy
Senior Member
 
JasonMcElroy's Avatar
 
Join Date: Jun 2005
Location: San Jose CA
Posts: 1,172
Default Re: Retorqued heads and bikes now running awful

Quote:
Originally Posted by Stormin View Post
Wow, it surprises me how sensitive the knucklehead is to small changes!
To my eyes. . .

If valve lash is set in thousands of an inch, then changing the stack height of the cylinder and head assembly by re-torquing the head bolts would definitely have a noticeable effect.

Jason
JasonMcElroy is offline   Reply With Quote
Old 09-15-2020, 01:02 PM   #12
govmule84
Forum Dipshit
 
Join Date: Sep 2010
Location: Eastern PA
Posts: 4,013
Default Re: Retorqued heads and bikes now running awful

Quote:
Originally Posted by JasonMcElroy View Post
To my eyes. . .

If valve lash is set in thousands of an inch, then changing the stack height of the cylinder and head assembly by re-torquing the head bolts would definitely have a noticeable effect.

Jason
To piggyback on that, this is why I always loosen the top motor mount before a retorque.
__________________
"Polished chrome and shiny paint were our gods and we prayed at their altar. Patina does not mean neglect but the wear and tear from use and care." - VonWegener
govmule84 is offline   Reply With Quote
Old 09-15-2020, 01:58 PM   #13
rhysmort
Senior Member
 
rhysmort's Avatar
 
Join Date: Jan 2016
Location: UK
Posts: 1,653
Default Re: Retorqued heads and bikes now running awful

Yeah I loosened it all off. We're back to running good today. The rear plug was running a little lean, turns out the retorque sorted it!

Running and riding great. 25 tooth was the best thing I've ever done.
__________________
King or street sweeper, everbody dances with the grim reaper.
rhysmort is offline   Reply With Quote
Old 09-15-2020, 05:19 PM   #14
Stormin
Senior Member
 
Stormin's Avatar
 
Join Date: Apr 2017
Location: near Edmonton, AB
Posts: 144
Default Re: Retorqued heads and bikes now running awful

Quote:
Originally Posted by JasonMcElroy View Post
To my eyes. . .

If valve lash is set in thousands of an inch, then changing the stack height of the cylinder and head assembly by re-torquing the head bolts would definitely have a noticeable effect.

Jason

Makes good sense, guess I'll have to be more cognisant of that on my next re-torque although I do check valve lash. Good reminder.
Stormin is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -5. The time now is 11:52 AM.