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
English French German Italian Spanish

TT carb.. today's lesson

Forums

Slowly I learn. 

Lesson 1: if the bike won't start in one or two kicks, don't waste energy but feed it with a fresh plug. Keep a plug and spanner in your jacket pocket. You know it makes sense! Don't give up and buy a Mikuni.

Lesson 2: if you want a TT to tickover steadily, don't butcher the slide  but add a set screw on top of the jet block. You will have the most inaccessible possible throttle stop, but it works perfectly and it totally unaffected by handlebar movements (unlike hanging the slide off the cable).

Attachments
Permalink

My TT carburettor came with a purpose-made cable which prevented the slide from bottoming out.  It also led to a situation where if you turned the handlebars once it had started it would cut out or the revs would increase depending in which direction you had turned the handlebars.  My learning curve [roughly equivalent to a 1-in-3] was that the carb is designed for that area between 4,000 and 6,000 rpm.  The supplied 5 cutaway and 350 main jet led to very brisk acceleration.  

A late friend spent two years trying to get his single to work with the TT carburettor.  His results were that he could get his machine to start easily but it would run atrociously, or it would hardly ever start but ran fantastically.  He had the patience of a saint [and a fair amount more] but eventually fitted a suitable Mk.1 concentric and it ran superbly.  When he sold the machine the TT went with it and the new owner fitted it back onto the machine and then complained that it wouldn't start!

Good Luck! 

Permalink

I run an Italian machine with a Dellorto SSI which is the same design as the TT , The only way to start is to flood till fuel drips,catch it on the throttle and hold a quarter open till the excess fuel is used ,then keep rolling the throttle . No use in traffic. When stationry keep the bike leaned over to the right .Not easy with a right side gearchange.

Permalink

They are both lever taps thanks Robert. Just 2 days before we were all imprisoned I nearly filled the tank, so I'm not keen on draining such a large amount of fuel. Although if it leaks enough it might be worth it!

PO fitted a cable stop but, as Colin says, tickover would change as I moved the bars, and it was always unreliable.

I keep blaming my starting problem on the carb  but actually it is solved by a fresh clean plug. I keep worrying about the oil control piston ring. It smokes when at tickover and pulling away from traffic lights when it is hot. It doesn't seem to leave a smoke trail on the road. Could it be the rather generous valve guide lubrication system? I've never seen direct oil injection into the valve guides before.

Permalink

Although I know some singles I've not had a Norton , but that sounds very likely .if the plug is not oily then it could be the exhaust guide.

Permalink

Is the "TT" carb really suitable for the "New" normal road use as it's name suggests,  spirited riding and bump starts?

 

John

Permalink

Its really only for racing,but some do make it work well enough for a  classic ride away from traffic.  The main problem is it turns you into a hooligan, I once tried to ride the Mayday run from Locksbottom to Hastings.The journey was frought with a thousand Jap crotch Rockets and police traps,I can't  do Traffic with that bike so made myself unpopular by overtaking all and sundry in all the wrong places ,"sorry can't stop"  get out of the way!. A bit like the pioneer LB run. Lucky not to get pinched. Better off with an Amal 289.

Permalink

It seems to be fine on the road. Not found any flat spots. They have numerous settings to play with and they are probably pretty hopeless if worn out. The air slide acts over the whole range so you can effectively change the main jet size on the road. Sounds a good way to burn holes in pistons...allegedly they tuned the race bikes to run fully open (maximum air), but closed the air inlet  a bit for the first few miles to enrich the mixture before the engine was fully hot. (I've been doing lots of reading in lockdown). Amal claimed the TT had to be flexible because "there's always a Governor's Bridge".

I suspect the main  drawback is the huge choke size, so low speed torque is probably not as good as with a smaller size. That makes the bike thirstier as well. The Inter has bags of torque and isn't as heavy as my Dommie 88SS, so even though in theory the Inter isn't as quick it certainly feels like it is.  I don't think the TT would suit the 16H.

 

Norton Owners Club Website by White-Hot Design

Privacy Policy