It followed me home!!

baz said:
That's excellent
And fitted with a proper carburettor
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It's. got a 30mm dellorto pumper I've dialed it down a couple of turns, it is still a bit rich on the over run , might drop th needle one groove , I wondered if 30 is too small, as it's been bored and stroked with a M20 crank to 597cc 94x90 .
 
Shelby-Right said:
It's. got a 30mm dellorto pumper I've dialed it down a couple of turns, it is still a bit rich on the over run , might drop th needle one groove , I wondered if 30 is too small, as it's been bored and stroked with a M20 crank to 597cc 94x90 .
Click to expand...
My mate had a similar setup on his b31 he had an M20 crank and xt yam piston
I'm pretty sure he had a 34 or 36 mm mikuni
 
baz said:
My mate had a similar setup on his b31 he had an M20 crank and xt yam piston
I'm pretty sure he had a 34 or 36 mm mikuni
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Actually scrub that
I just found a photo of his bike and it's fitted with a monobloc
I must have been thinking of his gold star
 

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baz said:
Actually scrub that
I just found a photo of his bike and it's fitted with a monobloc
I must have been thinking of his gold star
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I would like the look of a monoblock , I looked up sizes and found the 3761516 , think thats right , which is 1" & 5/16 or about 33mm , Edit , i got this wrong , it is just 15/16 🤪, I will work on all its other problems at the moment needs front shoes and steering head bearings, I just ordered them from montys motorcycles in UK , they have excellent freight prices , I bought their head race bearings because it said uk made , and the ebay ones , come from India .
 
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Shelby-Right said:
I would like the look of a monoblock , I looked up sizes and found the 3761516 , think thats right , which is 1" & 5/16 or about 33mm , they cost a bit , I will work on all its other problems at the moment needs front shoes and steering head bearings, I just ordered them from montys motorcycles in UK , they have excellent freight prices , I bought their head race bearings because it said uk made , and the ebay ones , come from India .
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I've never seen a 1" 5/16" monobloc
I have a right hand 689 that's bored to just over 29mm I thought that was about the limit
 
concours said:
The rubber plunger had popped off? View attachment 112122
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I've re assembled the primer and it appears to work
I hooked it up today and the bike started 3rd kick so I was quite pleased with that as it was pretty cold
The second time I tried it I accidentally flooded it so I'll have to get used to how much to give it to start
Previous to fitting the primer I had gone from 15 pilot jets to 25 to 30s with no difference
 
Shelby-Right said:
It's. got a 30mm dellorto pumper I've dialed it down a couple of turns, it is still a bit rich on the over run , might drop th needle one groove , I wondered if 30 is too small, as it's been bored and stroked with a M20 crank to 597cc 94x90 .
Click to expand...
30mm will probably be fine but will limit rpm I’d imagine. So unless you’re looking for the highest rpm, prob not an issue.

Pumpers are really designed for big carbs that are getting whacked open fast by QA twist grip though, so unless you’ve got a big carb, a QA twist grip, and an engine that wants to pick up rpm quickly, I’d have thought it to be of little help, and may even be a hindrance when it comes to dialling in jetting etc. Dunno owt about those carbs, but is it possible to disable the pumper for a trial and / or whilst dialling it in?

A monobloc would certainly look more at home though…
 
baz said:
I've re assembled the primer and it appears to work
I hooked it up today and the bike started 3rd kick so I was quite pleased with that as it was pretty cold
The second time I tried it I accidentally flooded it so I'll have to get used to how much to give it to start
Previous to fitting the primer I had gone from 15 pilot jets to 25 to 30s with no difference
Click to expand...
Yup, experiment with the quantity it wants.

A 1/3 stroke is likely enough.

Point of reference: 2-3 full pumps start an 800 twin at 0F.
 
Fast Eddie said:
30mm will probably be fine but will limit rpm I’d imagine. So unless you’re looking for the highest rpm, prob not an issue.

Pumpers are really designed for big carbs that are getting whacked open fast by QA twist grip though, so unless you’ve got a big carb, a QA twist grip, and an engine that wants to pick up rpm quickly, I’d have thought it to be of little help, and may even be a hindrance when it comes to dialling in jetting etc. Dunno owt about those carbs, but is it possible to disable the pumper for a trial and / or whilst dialling it in?

A monobloc would certainly look more at home though…
Click to expand...
I totally agree , the adjustment I made has greatly removed 85% of black smoko on a rev up , I will drop the needle a notch as it sounds like , it is slightly over fueled when not under load , I'm not after high rpm ,it cracks along ok , got to get those front brakes working better ! , it will be nice to get my Matchless G80 finished and my mate and I can go for a ride .
 
baz said:
I've re assembled the primer and it appears to work
I hooked it up today and the bike started 3rd kick so I was quite pleased with that as it was pretty cold
The second time I tried it I accidentally flooded it so I'll have to get used to how much to give it to start
Previous to fitting the primer I had gone from 15 pilot jets to 25 to 30s with no difference
Click to expand...
Further to this there are still some niggles
Although the primer now has a working one way valve this isn't 100%
It's letting by very slightly,I can see it drawing a very small amount of fuel through the primer I can see it drawing bubbles into the carbs causing some richness
I clamped the feed hose flat with some grips to confirm and it immediately stopped so I will ring up a feed that I can turn off
It's clearly a case of buying a cheap copy of a primer pump than the genuine article "buy cheap buy twice" applies here
But at least I now know it works in principle
I'm not having luck as yet finding a quality primer pump in the UK
Amazon are out of stock
The other thing I have noticed is a bit more smoothness in the idle as the bike gets to running temperature and the primer pipes empty of fuel the 3 pipes joined together are acting as a balance pipe
Which is something that was deleted very early on from the triples from what I can gather?
Maybe a balance pipe on the amals dosent work as well as it appears to on mikunis?
I've often wondered why twin carbed Brit bikes have a balance pipe but the triple dosent?
More questions than answers 🤔🤣🤣🤣🤣
 
baz said:
Further to this there are still some niggles
Although the primer now has a working one way valve this isn't 100%
It's letting by very slightly,I can see it drawing a very small amount of fuel through the primer I can see it drawing bubbles into the carbs causing some richness
I clamped the feed hose flat with some grips to confirm and it immediately stopped so I will ring up a feed that I can turn off
It's clearly a case of buying a cheap copy of a primer pump than the genuine article "buy cheap buy twice" applies here
But at least I now know it works in principle
I'm not having luck as yet finding a quality primer pump in the UK
Amazon are out of stock
The other thing I have noticed is a bit more smoothness in the idle as the bike gets to running temperature and the primer pipes empty of fuel the 3 pipes joined together are acting as a balance pipe
Which is something that was deleted very early on from the triples from what I can gather?
Maybe a balance pipe on the amals dosent work as well as it appears to on mikunis?
I've often wondered why twin carbed Brit bikes have a balance pipe but the triple dosent?
More questions than answers 🤔🤣🤣🤣🤣
Click to expand...
The "afterflow" you describe, I have always observed in the warm up period. After riding a bit, I observed that all the visible bubbles/fuel was gone from the tubes.
 
concours said:
The "afterflow" you describe, I have always observed in the warm up period. After riding a bit, I observed that all the visible bubbles/fuel was gone from the tubes.
Click to expand...
With mine it's causing rich running until I block the feed to the primer
Then it gradually empties the pipes and I can feel them pulse between the carbs
As a side affect it seems a little smoother
 
baz said:
With mine it's causing rich running until I block the feed to the primer
Then it gradually empties the pipes and I can feel them pulse between the carbs
As a side affect it seems a little smoother
Click to expand...
Replace that Chineez primer.
 
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Turned up today
Now we are cooking with gas
 

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baz said:
Took the r3 out for it's first ride in my ownership this evening I just thought fcuk it and stuck a number plate from another bike on
It ran pretty good
It starts well and holds an idle,revs out really well in the lower gears
But it's got an awkward riding position and the reverse gear lever is too close to the footpeg
It feels really heavy on the front end
The brakes are terrible
I had the feeling it'd spit me off given the chance
I'm going to replace the tyres and check wheel alignment
I need to take a look at the offset of the honda front end because the trail doesn't feel right to me
Click to expand...
Took the r3 out again today
It was much better than the last time when it felt like it wanted to kill me
After the last ride I realised the steering bearings had been set way too tight
The front tyre was ancient so I've fitted a new road rider
Also the tyre pressures were too low
It's now fitted with good working mikuni VMs and it pulls really well
A gave it a big handful and it revved really cleanly
It handles pretty good too
Future plans include uprating that Honda front brake and strengthening up around the swinging arm pivot before the frame cracks !
 
baz said:
Took the r3 out again today
It was much better than the last time when it felt like it wanted to kill me
After the last ride I realised the steering bearings had been set way too tight
The front tyre was ancient so I've fitted a new road rider
Also the tyre pressures were too low
It's now fitted with good working mikuni VMs and it pulls really well
A gave it a big handful and it revved really cleanly
It handles pretty good too
Future plans include uprating that Honda front brake and strengthening up around the swinging arm pivot before the frame cracks !
Click to expand...
May I refer you back to post #6…
 
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Fast Eddie said:
May I refer you back to post #6…
Click to expand...
There won't be much more work going on on this bike this year
Now I have proven the engine (albeit with a leaky top end)
The chassis is now proven for now
The bike will now move to the back burner whilst I get on with two others that are in front of it
There's not enough hours in the day
I need to retire then I could get all my projects done before I snuff it !
 
baz said:
There won't be much more work going on on this bike this year
Now I have proven the engine (albeit with a leaky top end)
The chassis is now proven for now
The bike will now move to the back burner whilst I get on with two others that are in front of it
There's not enough hours in the day
I need to retire then I could get all my projects done before I snuff it !
Click to expand...
One of the ‘old Boyz’ in my circle is 75, he retired 20 years ago and still works 7 days a week in his garage / workshop!

He keeps adding projects, but is not getting any closer to the goal, making him something of a Sisyphus.

But the busyness certainly seems to be preventing him from ‘letting the old man in’ !
 
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