Skip to main content
000000 000003 000006 000009 000012 000015 000018 000021 000024 000027 000030 000033 000036 000039 000042 000045 000048 000051 000054 000057 000060 000063 000066 000069 000072 000075 000078 000081 000084 000087 000090 000093 000096 000099 000102 000105 000108 000111 000114 000117 000120 000123 000126 000129 000132 000135 000138 000141 000144 000147 000150 000153 000156 000159 000162 000165 000168 000171 000174 000177 000180 000183 000186 000189 000192 000195 000198 000201 000204 000207 000210 000213 000216 000219 000222 000225 000228 000231 000234 000237 000240 000243 000246 000249 000252 000255 000258 000261 000264 000267 000270 000273 000276 000279 000282 000285 000288 000291 000294 000297 000300 000303 000306 000309 000312 000318 000321 000324 000327 000330 000333 000336 000339 000342 000345 000348 000351 000354 000357 000360 000363 000366 000369 000372 000375 000378 000381 000384 000387 000390 000393 000396 000399 000402 000405 000408 000411 000414 000417 000420 000423 000426 000429 000432 000435 000438 000441 000444 000447 000450 000453 000456 000459 000462 000465 000468 000471 000474 000477 000480 000483 000486 000489 000492 000495 000498 000501 000504 000507 000510 000513 000516 000519 000522 000525 000528 000531 000534 000537 000540 000543 000546 000549 000552 000555 000558 000561 000564 000567 000570 000573 000576 000579 000582 000585 000588 000591 000594 000597 000600 000603 000606 000609 000612 000615 000618 000621 000624 000627 000630 000633 000636 000639 000642 000645 000648 000651 000654 000657 000660 000663 000666 000669 000672 000675 000678 000681 000684 000687 000690 000693 000696 000699 000702 000705 000708 000711 000714 000717 000720 000723 000726 000729 000732 000735 000738 000741 000744 000747 000750 000753 000756 000759 000762 000765 000768 000771 000774 000777 000780 000783 000786 000789 000792 000795 000798 000801 000804 000807 000810 000813 000816 000819 000822 000825 000828 000831 000834 000837 000840 000843 000846 000849 000852 000855 000858 000861 000864 000867 000870 000873 000876 000879 000882 000883
English French German Italian Spanish

Monoblock games

Forums

I have been  trying to get my 99 to run better,  First it was rich,  dirty plugs.But went like a rocket while running A new needle jet and nearly seized it up!. back to the old jet and a 31/2 slide to replace the 3 ,spit backs on pick up but sooty plugs on the move. back to the new jet and raise the needle,better running but still spits back. Then looking at the new jet  its marked  T   , with no air bleeds,thanks carb experts!  drill the air bleeds ,  ,,worse,  T may mean two stroke?,  different internal  shape?. Back to old jet  and a 3 slide. ,wonder what it will do tomorrow?. Rich I think.  Measured a new 106  which is 107 !!,  Think buy 105 jet and size it myself.  And make that  31/2 slide into a 3 1/4  which is a size you can't buy.,but richer and will affect the needle height,  No fuel injection is this much fun!!. 

Permalink

Hi David.  Not been terribly impressed with new bits. The carb shows little wear ,so not prepared to give in ---yet. Will be giving it some mileage over the weekend . 

Permalink

hello you say you changed the cut off slides from 3,1/2 to 3 witch makes the carburetor rich now if you had gone to a 4 slide that will make the carburetor run that bit weaker mixture  I have the Amal Manuel and its some 140 pages with all types of Amal producs  and it tells you all about mixers and how to set up a carburetor right way and even has the setting for the GP and TT carbuertors  along with Mono bloc and concentric  and pre-monp bloc  and all their part numbers , So now the lower the slide number the rich the mixture  the high the number the weaker the mixture  Yours  anna j  

Permalink

Have you done one yet to establish main jet? Have you checked float level? Did mine by drilling 3 holes in a bit of perspex,was far too low. 106 needle jet no air bleeds just the 0.106” hole. Mines one 240 main, 106 needle jet middle notch. 3.5 slide spits back a little when cold

Permalink

Hi Anna, Over the years I have collected plenty of 376 slides .a whole set,plus a few customised ones. I also have a few carbs including Dellortos ,pumpers and SSI racing ( TT type) .I have recently aquired a brand new   Bowden sports carb in its orriginal box with full instructions and spare floats and jets ! can't imagine thats ever going to happen again. Wonder what it was for?. I also have the Amal book , but would like the book for the 1930's onwards. .Hi Peter,I have played with the fuel level and have some machined float valve bodies that give different fuel levels. but the orriginal one works best. I think the 106 should have air bleeds. Where does it say different?.

Permalink

...a mono lock float extension with glass end plate I have one. It helped with the velo...ven was not running right. (Starvation...)

will send it on if needed.

cheers jon

Permalink

Hi Jon,  A kind offer,  Things were running reliably for years, but always a bit rich and dirty ,plugs would soot up ,oil got carboned up a bit too quick. ,but it would ride well. Then I decided to fit some new bits--------. All went downhill from there. Its managing to run rich and weak at the same time.  To add to the fog , I was experimenting with increasing the oil feed to the head which always seemed dry and noisy. Its a balancing act  ,very easy to get too much oil and find  the ignition suffers. I have that sorted now with a customised tank union and a series of tiny adjustments to the tank return flow. What did not help was my local Esso garage where I bought my High grade non ethanol fuel would sometimes cheat and  fill the pump tank with EO 15 or 20 (  Carelessly slosh mixed EO5 !!) and that runs very weak in comparison. I have in the past envoked the weights and measures legislation and got a conviction for short supply for a garage and watered down Vodka for a pub !!, but fiddling is now endemic and no one is interested. Going for a run today armed with spare slides .Also need to burn off half a tank of god knows what it is and get some PETROL. (if I can find it).

Permalink

Robert,If it is running well but with sooty plugs, have you tried using different plug grades? Maybe a hotter plug will resist sootiness?

Permalink

Several years ago I  had similar problems with a Commando and 650SS.

We had a spark plug representative as a guest speaker at a club night and his answer was exactly that.  Modern fuels require a one grade hotter plug. I changed and both bikes now have clean combustion and slightly brown plugs. Can't comment on UK fuels as we have 98 octane ethanol free, 94 E10 and 91which is reputed to be E0 down here. 

Still it's a cheap test. 

 

Permalink

Had my  50 mile run,  a stop before a mile to take the tank/saddle off and drop the needle a notch.  Runs now as well as a normal 99 could be expected. However thats a major dissapointment as in the past  half throttle whisked me up to 80 with plenty to spare ,now although its making all the right noises ,I'm not convinced, the zip has gone. May wait untill I can fill up with the right stuff.Then go for plug chops or a dyno test. Serves me right for running out of petrol and having to fill up with FAKE stuff !!. The tiger has left the tank.

Permalink

Hi Ian/Alan,  I have fine wire plugs one grade hotter but after a Dieseling session and very blue pipes I dare not go hotter. Also noticed a few ally flakes on the plug , Just dodged a bullet there!!. Perhaps a move to the IOM  (no eth at all) will bring biking heaven.

Permalink

Worked on the bike yesterday,after being a bit disgruntled with the lack of zip. Pulled the slide from the monoblock and found the return spring wedged to one side and tight to the body. So probably not getting on the throttle as normal.    Must be old age.  Grumpy old git.

Permalink

I thought hot plugs damaged themselves (and might lead to running on...) but don't actually make the engine any hotter. But how many of us start our bikes on soft (hot) plugs to prevent oiling, and put in hard racing plugs designed to run cooler but therefore oil up when the engine cools down? The skill of changing plugs according to usage seems almost to have died out (like the skill of making flint arrow heads!).  But of course modern engines don't use oil like they did in olden days, so oiling up can't be such an issue.

 

Permalink

My overheated running on was caused by weak mixture on the needle jet  (a new 106T ,, whatever the T means)  ,Went back to a used 106 ,measured and found to be the least worn ,probably equating to a 1065 +, No spitting back but very sooty plugs and hunts a bit. Will go back a notch on the needle next.  I'm getting really quick on taking tank off now . The Gunsons Colourtune shows the pilot needs to be 3+ turns out  so the pilot is either too big or fuel level too high.  Think I will wait till I get a tank of  new Esso  before I do anything . That seems to run richer than EO5 .Don't want to have to start all over again.

Permalink

I notice that a number of suppliers are selling the Amal  106T  needle jet  ,sometimes described as 106   T style  .  and purporting that they are for a range of different machines . Looking thro the Amal books  it would appear that it was only specified for a couple of odd machines.  I dont know what the "T" stands for except that the one I was supplied  had no air bleeds .I am suspicious that it is also machined differently on the inside. Does anyone know more?.

 

Norton Owners Club Website by White-Hot Design

Privacy Policy