|
|
Post by marrcel on Jun 17, 2018 8:07:21 GMT 1
Just test driven my 31k and i had to turn in the airscrews from 1,5 to 1,0 turn open. Runs a lot better but not happy yet.
Well there are a lot of changes new stainless pipes, gutted airbox, boostbottle. That explains a lot. Running 27,5 pilot and 270 mainjet now. The mains i ordered from Ali.
But i was thinking maybee upping the pilot jet. With the standard cigar pipes i had upped the pilotjet already from 22,5 to 27,5. That was in the 80’s.
So upping to 30? Any advise on this would help me a lot.
|
|
|
|
Post by marrcel on Jun 17, 2018 8:17:31 GMT 1
|
|
|
|
Post by Tobyjugs on Jun 17, 2018 10:09:49 GMT 1
Hi marrcel I would suggest that you use original Mikuni parts in the carbs. I have used TOPHAM VERGASERTECHNIK GMBH, they have a fast turnaround and most parts are available.
What symtoms is your bike Showing?
|
|
|
|
Post by midlifecrisisrd on Jun 17, 2018 10:49:30 GMT 1
I'd say gutted airbox and pipes needs more than a 270 main
Steve
|
|
|
|
Post by marrcel on Jun 17, 2018 14:04:24 GMT 1
Hi marrcel I would suggest that you use original Mikuni parts in the carbs. I have used TOPHAM VERGASERTECHNIK GMBH, they have a fast turnaround and most parts are available. What symtoms is your bike Showing? Sputtering lean just above idle. Turning the airscrew in helped a lot. I m wondering any of you turn the airscrew less than 1.0 open? Thx for thejet adress. |
|
|
|
Post by marrcel on Jun 17, 2018 14:06:05 GMT 1
I'd say gutted airbox and pipes needs more than a 270 main Steve I ll do plug check next time. And make a picture |
|
|
|
Post by Tobyjugs on Jun 17, 2018 14:53:07 GMT 1
Hi marrcel it sounds like your doing the right thing but a 30 pilot with that size main jet does not sound right. Is the engine tuned? Have you tried moving the needle up and down.
I would first get the main jets sorted then start with the fine adjustments
|
|
|
|
Post by marrcel on Jun 18, 2018 19:17:52 GMT 1
Plugs after 4 sec fulpul and kill switched  |
|
|
|
Post by marrcel on Jun 18, 2018 19:21:47 GMT 1
Seems pretty good to me. Next is to up the needle.
|
|
|
|
Post by Tobyjugs on Jun 18, 2018 20:25:26 GMT 1
That looks ok but i would go 1 up on the main jet and hold it open a little longer. My personal preference would be just a little darker (safer).
|
|
|
|
Post by marrcel on Jun 18, 2018 22:34:53 GMT 1
I agree on that Tony. Thx.
|
|
|
|
Post by Mr M T Pockets on Jun 23, 2018 11:48:44 GMT 1
hi i would suggest 280 to 290 on your mains ,i had 32.5 pilots so i could get the air screw out , needle second groove from top,you can use a tiny shim washer under the needle clip for fine adjustment on needle,i had one of those boostbottle and it ran way better without it ,
if you start going mad on pilot jet sizes,do a leak down test and pray
|
|
|
|
Post by marrcel on Jul 11, 2018 20:32:07 GMT 1
Installed 290 today and that was to rich. Next time 280 main.
|
|
|
|
Post by marrcel on Jul 11, 2018 20:34:48 GMT 1
Topham parts list. Which vm26 number?  |
|
|
|
Post by marrcel on Jul 11, 2018 20:41:37 GMT 1
Is this the original type of pilot?  |
|
|
|
Post by marrcel on Jul 11, 2018 20:48:44 GMT 1
This question comes up after i saw pilot jets with bleed holes for vm carbs. At least in the spare part pictures of topham.
|
|
|
|
Post by Tobyjugs on Jul 12, 2018 10:54:07 GMT 1
I have the numbers you need at home i will send them to you tonight
|
|
|
|
Post by muttsnuts on Jul 12, 2018 12:11:29 GMT 1
pilot jet is M28/1001
rule of thumb for pilot jetting, half a turn out or less on the air screw, up the pilot jet, 4 turns fully out on air screw, drop the pilot jet, nothing wrong with the air screw being half a turn out, I have some that run 1/4 turn out, but its a bit close for me as you lose adjustment, so I use half a turn out as my rule, but each to their own, what matters is what makes it run correctly
HTH
|
|
|
|
Post by marrcel on Jul 12, 2018 16:34:16 GMT 1
Thx that some real helpful advice. So with 27,5 and half a turn out will bring the same as 30 and say 1,5 turn out?
|
|
|
|
Post by muttsnuts on Jul 12, 2018 16:40:05 GMT 1
Thx that some real helpful advice. So with 27,5 and half a turn out will bring the same as 30 and say 1,5 turn out? give or take yes |
|
|
|
Post by Tobyjugs on Jul 12, 2018 21:32:18 GMT 1
Hi Marrcel The number mutts gave is the same numbers that Topham use, just quote the size of the jet after the M28/1001-??
|
|
|
|
Post by marrcel on Jul 23, 2018 20:13:14 GMT 1
This an update after a few fouled plugs at 290 280 and 270 mains.
I didnt exacty know, what is a gutted airboxx? Mine is empty, no snorkel. The lid which is under the standard airfilter element contains say 10 holes 25mm. May be that explains the smaller main jets.
Next time trying 260. Thats after i raised the float level from 22.0 to 20.5. That helped the pilotjet a lot. 32,5 now with airscrew at 1.25 open at the moment.
And wow what a weather for playing with the carbies😎
|
|
