really likes Carpe
Posted 04 January 2021 - 12:33 pm
really likes Carpe
Posted 04 January 2021 - 02:49 pm
Well, now I have an answer :-)
When I connect undercover space with atmosphere (remove camshaft sensor) the air go through the pipe and back.
900er engine too sealed ...
Monkey Boys Monkey
Posted 04 January 2021 - 09:12 pm
I don't know but maybe the pipe only vents at a certain pressure ?
Mk2a 2000 in Silver. Top end Refurb @ 41100 miles, Scottoiler, Renthal Road High Bars, Up & Back Bar Risers, Bellypan, DL650 Handguards, Capt. Picard Bar Ends, House of Henty SS Wheel spacers, New Seat Cover Fitted. 58 MPG !! Now owned by chrisbee ! Studley's mk2a Bloggerydoodaah ! Photos of my first MK1 Photos of my MK2a TPLQHCSRSFC No. 1 Fan
really likes Carpe
Posted 05 January 2021 - 06:14 am
I have not found such information
Carpe Citizen
Posted 05 January 2021 - 08:57 am
Well, now I have an answer :-)
When I connect undercover space with atmosphere (remove camshaft sensor) the air go through the pipe and back.
900er engine too sealed ...
I'm trying to imagine how the oil which is pumped to the top of the engine returns through any seals ?
The oil is free to run down the camchain pathway, which directly links to the bottom of the crankcase.
The lower crankcase vents through it's own .....errrr...vent, so there is no obvious sealing that I can see.
The cam cover has a device built into the breather outlet, which I thought was only to prevent splashes/droplets of oil from migrating to the airbox. Perhaps there is some valving inside that mechanism.
The pictures on this ebay listing show the inside of the camcover
https://www.ebay.co....eUAAOSwl9dd07Wj
EDIT - the items 17,18 and 19 are all for the breather. It shows no valve. Perhaps there is a blockage ?
https://www.fowlersp...a/cylinder-head
Is it possible that someone has attempted to disable the AIS system by blocking it off at the rocker cover, but they chose the wrong pipe ?
Edited by fixitsan, 05 January 2021 - 09:04 am.
900 with better bits. Owes me nothing, Makes me smile
really likes Carpe
Posted 05 January 2021 - 08:17 pm
EDIT - the items 17,18 and 19 are all for the breather. It shows no valve. Perhaps there is a blockage ?
https://www.fowlersp...a/cylinder-head
Is it possible that someone has attempted to disable the AIS system by blocking it off at the rocker cover, but they chose the wrong pipe ?
Now I temporary blocked AIS too :-) Looking for knocking sound source from cylinder head :-(
really likes Carpe
Posted 06 January 2021 - 01:44 pm
Next step - start engine when breath pipe removed. Result - strong air flow from cover flange. Breathing is OK :-)
has been here 4ever
Posted 06 January 2021 - 06:58 pm
there's a reed valve in there which suggests air out only at certain pressure
"As I Lay Rubber down to street, I pray for traction I can keep. But if I skid and begin to slide, please dear god protect my ride"
Mods; Oil pressure switch, neoprene rear inner mudguard, scottoiler, highway pegs, fenda extenda, 1999 carbs and airbox, Kais suspension setup, later clutch springs, LED lamps, Metmachex swingarm, Hagon Shock, Oxford heated grips, 4 way fused accessory Bus, 17" 3CV front wheel, Michellin R6 tyres, GPS speedo, 5' ignition advance.
really likes Carpe
Posted 12 January 2021 - 03:49 pm
there's a reed valve in there which suggests air out only at certain pressure
There is no reed valve in parts catalogue ...
has been here 4ever
Posted 12 January 2021 - 10:18 pm
"As I Lay Rubber down to street, I pray for traction I can keep. But if I skid and begin to slide, please dear god protect my ride"
Mods; Oil pressure switch, neoprene rear inner mudguard, scottoiler, highway pegs, fenda extenda, 1999 carbs and airbox, Kais suspension setup, later clutch springs, LED lamps, Metmachex swingarm, Hagon Shock, Oxford heated grips, 4 way fused accessory Bus, 17" 3CV front wheel, Michellin R6 tyres, GPS speedo, 5' ignition advance.
really likes Carpe
Posted 13 January 2021 - 07:41 am
You are talking about AIS valves. My post is about head cover vent pipe :-) (pos. 18.19 on this picture)
has been here 4ever
Posted 13 January 2021 - 10:15 am
You are talking about AIS valves. My post is about head cover vent pipe :-) (pos. 18.19 on this picture)
yes, the reed valves sit onto 18/19 then the vent pipe attaches to the reed valve cover.
The cam cover sits between the two items according to the schematic.
"As I Lay Rubber down to street, I pray for traction I can keep. But if I skid and begin to slide, please dear god protect my ride"
Mods; Oil pressure switch, neoprene rear inner mudguard, scottoiler, highway pegs, fenda extenda, 1999 carbs and airbox, Kais suspension setup, later clutch springs, LED lamps, Metmachex swingarm, Hagon Shock, Oxford heated grips, 4 way fused accessory Bus, 17" 3CV front wheel, Michellin R6 tyres, GPS speedo, 5' ignition advance.
really likes Carpe
Posted 14 January 2021 - 05:24 pm
Are you saying that we have 2 small AIS reed valves and another one reed valve for the valve cover vent pipe? Is there three reed valves?
Maybe I can't understand you right because my English is terrible :-(
Carpe Citizen
Just won't go.
Posted 19 January 2021 - 01:12 pm
Current toys: '99 XT600E, 2000 4TX, '82 Princess 30DS (where the username comes from), No longer a '03 Fazer thou.
Save the planet, it's the only one with beer!
needs a 2nd hobby
Posted 19 January 2021 - 05:39 pm
yes, the reed valves sit onto 18/19 then the vent pipe attaches to the reed valve cover.
The cam cover sits between the two items according to the schematic.
errr - no, it doesn't.
18 & 19 vent the cover to the air filter housing via the outlet from the cover that points towards item 22 in the diagram.
The parts 18 & 19 are visiible in dandywarhol's picture at the far end in line with the spark plug holes, appearing as a box.
The diagram on p5-7 of the WSM clearly shows the hose that connects cover to housing.
The AIS hose from part 21 goes to the filter housing too. The two hoses are shown as items 1 & 2 on the WSM diagram on p3-9.
HTH
ADD If you want to see the two hoses they appear in this post of mine a while ago. http://www.carpe-tdm...=12948&p=312541
Edited by steve27bha, 19 January 2021 - 05:51 pm.
TDM900A 2008/09 in use, with 
CBX750FE in reserve; Cagiva N90 125 now rebuilt & in use.
needs a 2nd hobby
Posted 19 January 2021 - 06:07 pm
Do the 2 small stubs under the AIS valve connect to the exhaust ports?
It looks like it.
See this parts diagram: https://www.fowlersp...a/cylinder-head
The gasket #25 has two small circles and they match the holes in the cylinder head between and slightly in front of the plug sockets.
Also, that is how the Honda PAIR system works, on the VFR800Fi for instance. Been there, done that one too.
Edited by steve27bha, 19 January 2021 - 06:09 pm.
TDM900A 2008/09 in use, with
CBX750FE in reserve; Cagiva N90 125 now rebuilt & in use.
really likes Carpe
Posted 20 January 2021 - 06:08 am
crankcase breather should surely be open to airfilter with just an oil separator.
This is what I wanted to clarify :-)
I thought that there might be one more reed valve and it can make knocking noise.
Edited by pavel79, 20 January 2021 - 06:10 am.
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