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51
General Discussion / Re: Calling all mates with Mikuni RS36 experience.
« Last post by Turd Ferguson on April 13, 2024, 10:19:03 PM »
Quote from: pgnz on April 12, 2024, 07:42:51 PM
if you're running the vac from a manifold sounds like
the hose isn't restricted enough which makes the vac unit
chatter, mine (kiehin 36 carbs) runs smooth as silk at
idle with a fuel hose from manifold spigot, the aperture/restrictor
inside the hose being a small tight-fitting hollow tube, the
tube plugged with epoxy, and a hole thru it from a single
skinny bit of bread-tie wire...  Pulled the wire out when the
epoxy was firm but still setting leaving that tiny hole, it's
only half a mm diameter.. Idle, acceleration and cruise
all running sweet ..

Yeah, I kind of did the same thing so far ... I got me a set of wire gages to measure the ported vacuum hole in the # 2 carb. It is 0.030 inches or 7.6mm. Got me a set of micro drill bits. I am still using the drip irrigation valves because with manifold vacuum you cannot shut of the vacuum signal to the advance unit like the stock carbs where vacuum is ONLY applied when the throttle blade opens (ported vacuum signal). That means with manifold vacuum at idle the engine runs with the static 10 deg. advance plus the full 16 deg advance the vacuum unit provides. SO a total of 26 deg advance at idle is way too much and makes for a very, very bad idle. So I modified the irrigation valve by closing its input side and drilling a .030 hole for damping the signal, but I can still shut off the vacuum signal in city traffic to have decent idle. On the open road you want the vacuum unit to work. It makes for better part throttle response and without the vacuum advance your mileage drops from 38 mpg to 32 mpg in my case.
52
Q and A / Re: Valves
« Last post by pgnz on April 12, 2024, 07:55:17 PM »
80' valves are bigger than 78' valves but only one side
exhaust or inlet can't remember but think it's the inlet
valve that's bigger by a mm..
53
General Discussion / Re: Calling all mates with Mikuni RS36 experience.
« Last post by pgnz on April 12, 2024, 07:42:51 PM »
if you're running the vac from a manifold sounds like
the hose isn't restricted enough which makes the vac unit
chatter, mine (kiehin 36 carbs) runs smooth as silk at
idle with a fuel hose from manifold spigot, the aperture/restrictor
inside the hose being a small tight-fitting hollow tube, the
tube plugged with epoxy, and a hole thru it from a single
skinny bit of bread-tie wire...  Pulled the wire out when the
epoxy was firm but still setting leaving that tiny hole, it's
only half a mm diameter.. Idle, acceleration and cruise
all running sweet ..
54
General Discussion / Calling all mates with Mikuni RS36 experience.
« Last post by Turd Ferguson on April 03, 2024, 09:29:20 AM »
Alrighty .. calling all mates with Mikuni RS carb experience. So far my build has gone well ... https://youtu.be/1-yzBGR_Oa4?si=dMBpcPk6D9rGymG1 ... little niggles like fuel line routing and waiting to get about 500 miles before I lay a little more into her .. keeping rpm varying and below 5000 rpm. BUT here is the deal: THose RS carbs do NOT have a ported vacuum spigot like the BS34 carbs. That is generally not an issue (I did what Andy did on his basket case cafe racer and use an irrigation valve) EXCEPT at idle. Without such a port you have full vacuum advance at idle and that makes for a nervous and vibey idle. Actually really terrible. Once you go it's fine but sitting still it's bad. Has anyone drilled a ported vac port (a port that does not provide a vacuum signal until the throttle is slightly opened) into these RS carbs?
55
Q and A / Valves
« Last post by Colin on March 27, 2024, 01:50:57 PM »
I'm looking for valves for XS1100E 1978. I found a set online for "Yamaha XS1100 1980-1983 Engine Valve Set". Are these not suitable for my bike? Colin
56
For Sale / 1980 XS1100G for sale
« Last post by mosto on March 18, 2024, 03:12:01 PM »
Have my 1980 XS 1100G on gumtree.
https://www.gumtree.com.au/s-ad/mount-hutton/motorcycles/1980-yamaha-xs1100g/1323050025
If of interest to any one on this site.

Ready for restore completion or just ride.
Recently had full service including complete Carby clean and tune.
Also, brakes systems overhauled including new brake lines.
New Autobatt battery and Pirelli tyres.
Re-registered after about 20 years parked up, on club Rego, so non-transferable.
Heaps of spares including spare tank etc to complete restore or sell on.
$6500


57
Somewhere to be on the Bike / VJMC 2024
« Last post by Christian Raith on February 18, 2024, 02:17:29 AM »
VJMC rally this year is Yamaha's turn to host in South Australia Nuriootpa
So far there are 267 attending.
Still time for the XS1100's to make a good showing.......

Registration details here

https://www.vjmc.org.au/2024-vjmc-national-rally-registration
58
Workshop / Re: Front End issues
« Last post by mosto on January 14, 2024, 03:25:28 PM »
Thanks for checking in Jonesy.
Only just finished setting up string lines. Looks to be really bad misalignment of the forks.
Just googling how to realign and will give you some feedback after this is done.
59
Bits Needed / Re: Brake shims
« Last post by Paul on January 07, 2024, 08:11:59 PM »
The Metzeler on the front did its job but time to stump up for new tyres. The RH didnt let me down and I thoroughly enjoyed the ride, no hairy moments, enough traffic to make it annoying although probably a good thing along the old pacific highway as mobile and stationary cash traps were about. On a Tuesday as well, pinching all the retirees
60
Somewhere to be on the Bike / Re: Walcha, NSW - get together - January 12th to 15th 2024
« Last post by Christian Raith on January 07, 2024, 06:45:49 PM »
https://www.visitnsw.com/destinations/country-nsw/armidale-area/walcha
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