What now??

[t4tiger]

Completely agree that the advice and support from you guys is brilliant and invaluable.  For me it's a balance of time, patience and confidence.  It's the latter two that I struggle with. That said, I've quite enjoyed the trials and tribulations of working through the various ideas and do feel more confident than I did just a few months ago. 

To bring the story of my bike up to date, I have now done lots of testing with different mixture screw settings and am pleased with the results...  It feels good again and I am enjoying riding it.  However, the perfectionist in me knows there is still a slight backfire and the Speedo needle fluctuates at idle.  From my reading I realised that if the mixture screw is in tight the bike should stall. It does for middle and left cylinder but not the right.  I think this suggests that I still have an air leak.   The method of spraying the carbs with carb cleaner to see if anything is being sucked in showed nothing so I am assuming that there is something still not quite right inside the carb itself.  Not Enoch to want to strip it down again but something for the future....  Just gonna ride and enjoy for now. Regards H

[ram33]

To bring the story of my bike up to date, I have now done lots of testing with different mixture screw settings and am pleased with the results...  It feels good again and I am enjoying riding it.  However, the perfectionist in me knows there is still a slight backfire and the Speedo needle fluctuates at idle.  From my reading I realised that if the mixture screw is in tight the bike should stall. It does for middle and left cylinder but not the right.  I think this suggests that I still have an air leak.   The method of spraying the carbs with carb cleaner to see if anything is being sucked in showed nothing so I am assuming that there is something still not quite right inside the carb itself.  Not Enoch to want to strip it down again but something for the future....  Just gonna ride and enjoy for now. Regards H

have you changed the orings on the mixture screw and out the ringsand washer back in the correct order?

[t4tiger]

Hi ram, no, I haven't touched them.  I'll be looking next time I strip itp down.....and there will be a next time :icon_wink:

[Sin_Tiger]

have you changed the orings on the mixture screw and out the ringsand washer back in the correct order?

Good point. Just because you haven't touched them doesn't guarantee they are assembled correctly or in good order. The Fiche diag suggests an incorrect order. I'll try to find a pic.

[ram33]

Hi ram, no, I haven't touched them.  I'll be looking next time I strip itp down.....and there will be a next time :icon_wink:

sometimes the orings leak air after a few years even though they look good

[nickjtc]

Get yourself a Morgan Carb tuner. Just ask how to use

+3. Yes, cost involved, but it pays for itself the first time you use it.

[Danwarb]

Hey guys, Hi T4,

In my case it turned out to be the jubilee clips not clamping down on the rubbers efficiently so air was getting it. It's sorted now how ever . . .

As you T4 if I rev quickly from Idle there is a pause, a splutter THEN the revs kick in.

Did you have the same?

is this possible because of blocked jets (Inrecently cleaned my carbs) or is it simply how these carbs react with such sudden revving from 1500rpm upwards?

[Mustang]

or is it simply how these carbs react with such sudden revving from 1500rpm upwards?

ding ding ding .........................they all do that

[Danwarb]

Hi Mustang, Hi guys,

I'm interested to ensure I'm getting the best set up I can on my carbs to get the best response and power.

In this article he speaks of the modifications that can can applied to speed up the physics of the diaphragm and thus the slides lifting when the the throttle is opened.

This includes drilling the side holes on each slider to just over 3mm and cutting two turns off each of the slider springs.

Have any if you tried these more minor modifications and had them succeed?

Cheers,

Dan

[nickjtc]

Have any if you tried these more minor modifications and had them succeed?

Speaking from personal experience with Stanley. The PO decided that a) he wanted people to be able to hear his bike and b) he wanted to increase its 'peppy-ness'. So he drilled holes in the end of the mufflers, installed a Dynojet kit (and did the internal carb mods), removed the snorkel cap on the airbox and replaced the air filter with a K&N.

He admitted to me the day I bought the bike that all of this made very little perceptual difference to performance of the bike. He also commented that the fuel consumption increased noticeably. Having owned it for 18 months now and having put about 10,000km under its wheels I cannot comment as to its 'as stock performance', but can comment that although I like the 'sound' I do not like the 'noise', and I definitely do not like the horrible fuel consumption figures I am getting. And for my riding requirements any 'improvements' in performance are moot because, being a ghof, I am not interested in bouncing the engine off the (metaphorical) rev-limiter every time I ride.

In short: as soon as I can I am putting the fuel and exhaust system back to stock.

[JayDub]

Hi Mustang, Hi guys,

I'm interested to ensure I'm getting the best set up I can on my carbs to get the best response and power.

In this article he speaks of the modifications that can can applied to speed up the physics of the diaphragm and thus the slides lifting when the the throttle is opened.

This includes drilling the side holes on each slider to just over 3mm and cutting two turns off each of the slider springs.

Have any if you tried these more minor modifications and had them succeed?

Cheers,

Dan

I doubt that anything that minor would give any significant increase in anything but your frustration, I think you could be opening a can of worms Dan, I've noticed that whenever you alter something in the fuel/air/zorst system, it usually has an adverse affect on some aspect of the running of the bike, (especially with steamers)  - if it ain't broke.... there's a few on here who have had to spend time and cash on returning theirs to standard to cure running problems that a PO has caused - me included, and its still not right 

[Mustang]

Hi Mustang, Hi guys,

I'm interested to ensure I'm getting the best set up I can on my carbs to get the best response and power.

In this article he speaks of the modifications that can can applied to speed up the physics of the diaphragm and thus the slides lifting when the the throttle is opened.

This includes drilling the side holes on each slider to just over 3mm and cutting two turns off each of the slider springs.

Have any if you tried these more minor modifications and had them succeed?

Cheers,

Dan

you will be sorry
the steamers run best when left at the way triumph designed them .........................

[GavD]

 

Leave it be ............. ride it

[Sin_Tiger]

Go there and buy a big mixed bag of regret, disappointment, and frustration, not too mention the large dent in your bank account, then you go into overdraft trying to get it back to what was a perfectly good machine and most likely end up selling it and swearing off T400's for a long time.

Tell you what, send me £300 for a set of modified slides, with matching needles and jets and some really offensive end cans that sound great but do sod all as far as performance goes. When you get tired of trying to get something that you enjoy riding every day, send me the parts back and I'll refund you £100. It'll be the safest £200 I'll ever bet 

Alternatively, pack your bags, put £200 in your pocket for petrol and If you don't come back very tired, happy in a way that will have the drugs squad giving you a second look and several sports bike riders wondering if they should have bought a old big trailie instead, I will send you that load of comerativ scrap for free to use as a small boat anchor. 

[JayDub]

↑ ↑ You can't argue with that can you Dan? ↑ ↑