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

Five speed box

Forums

Hi ,

has anyone fitted a 5 speed gear box to a road going Dominator 88 , if so what’s the verdict, are the ratios good for road use?

DAVID

Permalink

Most 5-speeders I know of has a higher 1st than the standard gearbox. Makes it a bit more impractical in traffic. What you really want is a wide ratio gearbox that gives you a low first for slow going and a tall fifth for keeping revs down when cruising. Sadly I don't know of anyone. My only experience is of TTI and Quaife for racing. There they makes it easier to keep the engine in its narrow power band.

Mike

Thanks Mikael,

it was my suspicion that the box done by Mick Hemings was designed more for racing than road going.. I guess I will persist with my box repairs which seem to be going badly, only two gears at the moment!!!!

David

Permalink

If we were to get a 5Th speed would it be direct drive? , this would mean that most of the riding would be in an indirect 4th with the subsequent heavy wear on the sleeve gear?? And the need to fit a bigger box sprocket to get an overdrive effect ,which would mean all the gears ratios would then be raised, or need to be lowered to compensate?.  Not simple.

Permalink

No idea how a Quaiffe cluster would go on an 88 but when looking at a full gearbox refurb on my Mk 3 850, decided instead on a 5 speed from Mick Hemmings. This was around 20,000 miles ago and I would never refit the 4 speed despite many comments on various forums about there being no need for more than 4 gears. The torque doesn,t compensate for the gaps between the gears from my experience and that same torque with decent ratios is way better.

I kept the standard 4.38 gearing and it,s one of my best mods for riding enjoyment on my bike with no problems. I use the standard type mineral oil recommended by Mick at the time and change it every 2 years although probably not needed. First gear is higher but hardly a problem and certainly doesn,t make riding in traffic more difficult. 

You should have a word with Mick Hemmings if he,s still available, or do a bit of research to check the 88 first gear and compare it to the available Quaffe ratio with a kickstart. That would be the only consideration apart from price, but I suspect it would make riding your own bike a much nicer prospect especially if you enjoy riding roads with many corners.

Top gear is direct so that will be the same as standard assuming you have the original sprocket and tyre sizes, no need to overgear if you are happy as it is, or worry about sleeve gears!

In reply to by neill_watkins

Permalink

Thanks neil,

i have finally decided to fit a 5 speed unit and am in the process of ordering from Mick Hemings.i will strip the bike yet again in preparation ready to slot one in upon arrival!.

regards to all.

DAVID

Permalink

I can see that a closer ratio box  would make an 850  a pleasant ride and it would pull the higher first gear no problem . It already has a fairly high top  so maybe does not need a cruise 5th anyway and with the Isos does not vibrate at 75mph.. The 88  will struggle with a higher first but can cruise at 75 as its a smoother motor . The 99/650/Atlas  are the ones  that really need an overdrive 5th  to allow comfy 75 mph cruise as the vibrations are greater. A close ratio box will not do the job.

Permalink

David

you should also get the improved layshaft bearing with the kit. I,m pretty sure I had to reverse the camplate because of the Mk3 lefthand gearshift but your kit should be a straightforward fit.

Because it was my first Britbike gearbox rebuild, I found the Old Brits Commando gearbox tech notes below very helpful along with the workshop manual and Hemmings instructions. I also replaced all bearings seals, springs etc.

https://www.oldbritts.com/gearbox_a.html

Regards

 

 

Norton Owners Club Website by White-Hot Design

Privacy Policy