Britbike forum

Classic British SparesKlempf British PartsBaxter CycleThe Bonneville ShopLowbrow CustomsGirling Classic MotorcycleLucas Classic MotorcycleHepolite PistonsIndustrial tec supplyJob Cycle

Upgrade your membership to Premium Membership or Gold Membership or even Benefactor


New Sponsor post
Triumph 650/750 High-Output Alternator Kit
by The Bonneville Shop - 01/13/23 11:29 pm
New FAQ post
Missing edit button
by wrench136 - 05/30/22 2:57 pm
News & Announcements
Premium members! 🌟
by Morgan aka admin - 01/28/23 3:01 pm
Buy BritBike staff a coffee ☕️ or pint 🍺
by Morgan aka admin - 01/15/23 9:29 am
Benefactor ✅
by Morgan aka admin - 01/08/23 8:38 pm
Gold members! ⭐️ ⭐️ ⭐️
by Morgan aka admin - 01/03/23 6:30 pm
How to guides - Technical articles
British Fasteners Specs
by Morgan aka admin - 01/03/23 1:29 pm
ShoutChat
Comment Guidelines: Do post respectful and insightful comments. Don't flame, hate, spam.
Member Spotlight
Tridentman
Tridentman
New Jersey USA
Posts: 6,334
Joined: February 2008
Top Posters(30 Days)
Lannis 76
DavidP 64
Top Likes Received (30 Days)
Kev. 36
DavidP 25
Newest Members
sam keller, Raz, HermDawg, 47sqfour, Blackdoctor
12,383 Registered Users
Forum Statistics
Forums35
Topics76,514
Posts783,703
Members12,383
Most Online204
Jul 10th, 2022
Random Gallery photo
Photo posting tutorial

Thread Like Summary
Anteojito, JubeePrince, Mike Baker, Noe
Total Likes: 5
Original Post (Thread Starter)
#871350 02/07/2022 12:43 AM
by Anteojito
Anteojito
I put the transmission back in and it feels like it is indexed right. I can change gears smoothly but then I will feel the quadrant slip. The gear shift lever will end up in the one o'clock or five o'clock position instead of the three o'clock position. The quadrant does not look worn at all. I replaced the plunger springs and the plungers don't look worn either. Anybody have any ideas what I am doing wrong?

Thanks,
Liked Replies
#871371 Feb 7th a 07:48 AM
by TR7RVMan
TR7RVMan
Hi Anteojito, What year is motor? 4 or 5 speed?

I had similar problem on a ‘69 Bonnie. Problem was incorrect oring on gear shift shaft. ‘69 & older the shaft has a smaller groove for oring. So it needs the skinny oring.

Starting 1970 the groove & oring got larger. PROBLEM IS… many (most) parts sellers, sells late ring under early part #.

If you struggle getting gear shifter shaft into outer cover, you probably have incorrect ring. Shaft installed with correct ring it should rotate freely without binding.

As Madigen suggests check shaft is not slipping in quadrant when it’s out.

Also make sure the 2 curved springs are perfect condition. They tend to rust. I renew them unless perfect.

After installing the C shaped retainer plate. Leave plungers out. Move shifter lever many times. Verify the curved springs very reliably center the gear shifter lever.

Should you miss indexing it doesn’t effect centering of shifter. Missing indexing you can’t get 1st or top gear. Or less gears depending how far you miss.

Be aware plungers, gear shifter quadrant (the part the plungers go into are specific for 4 or 5 speed. Still that doesn’t prevent shifter from reliably centering.

On the ‘69 Bonnie I got wrong oring from 2 suppliers. Hardware store didn’t have suitable size. I found good size in my “spare” oring box from work. I don’t know what part #. Was from older Mercedes automatic trans or steering box.

Please let us know what you find.
Don
1 member likes this
#871404 Feb 7th a 03:42 PM
by Anteojito
Anteojito
Thanks. I'll check those things too. I did have some issues getting the shift shaft in the outer cover. I'll take it all apart and take a look at the O-ring. I've replaced all the springs, I figured what the hell, why not. Funny how it can be a little thing that throws something out of whack. I'll let you know what I learned.

Kent
1 member likes this
#871411 Feb 7th a 05:23 PM
by JubeePrince
JubeePrince
Originally Posted by Anteojito
I cleaned the guide plate and didn’t notice any burrs


Being as you're pulling it back apart: be sure to grease/lubricate with gear oil all the moving parts in the outer GB cover. This cover is notorious for lack of lubrication and with wild temperature swings (Hot days cool/cold nights) can build up condensation and corrosion quickly.

Once or twice a year, I'll have a friend help me lean the bike way over on it's right (timing) side to coat the inside of the outer cover well with the gear oil from the gearbox.

Cheers,

Steve
1 member likes this
#871529 Feb 8th a 07:37 PM
by TR7RVMan
TR7RVMan
Hi, I change trans oil every 2500 miles. About twice a year. I have oil suction equipment. I suck the oil out of outer cover every oil change. Has not really improved anything as far as rust goes. I still do it as why not do all I can to help things.

I gave a lot of thought to drilling hole(s). A few 3/32 holes I don’t think clutch cable end could pass through. I’ve had 2 cable ends break off as well. I was able to retrieve them through filler hole with skinny flex magnet.

Question. The earlier b’69 & older have trans vent in upper front of outer cover. The primary on these is vented into trans via clutch rod bore. A small venting through clutch cable & quadrant pivot shaft as well.

However starting 1970 650/750 the outer cover vent was not drilled. Trans now is vented into primary case via clutch rod bore. So now as bike cools trans sucks moist air from primary into trans. If I worked 30 years at dealer I’d know for sure, but I’ve noticed primary breather bikes trans seems to have about twice the rust. Plus rust you see on clutch parts.

Riding along on boring stretches of highway I ponder these things. I’m always looking to be better mechanic & make bike last longer. It’s a sickness!!
Don
1 member likes this
#871544 Feb 8th a 11:02 PM
by NickL
NickL
I always found chain lube was a good thing to use on the trumpet's
gear change mech. Both the 500 and 650. Lasts really well.
1 member likes this
British Cycle SupplyMorries PlaceKlempf British PartsBSA Unit SinglesPodtronicVintage MagazineBritBike SponsorBritish Tools & FastenersBritBike Sponsor






© 1996-2023 britbike.com
Powered by UBB.threads™ PHP Forum Software 7.7.5