nicmk1est Posted April 28, 2012 Share Posted April 28, 2012 hi allim having problems in getting the front carb to run rightnew diaframs fitted,new petrol valve fitted,3 full turns out,run rough until i restrict the air going with my hand,then it run perfect and rev`s thru but soon as i remove my hand it go`s lumpy,,,,any idea why? Link to comment Share on other sites More sharing options...
AlanChatterton Posted April 28, 2012 Share Posted April 28, 2012 sounds like an air leak on the inlet manifold or carb to manifold joint to me. Link to comment Share on other sites More sharing options...
nicmk1est Posted April 28, 2012 Author Share Posted April 28, 2012 ah,,,i have got coming new manifold to head gasket,,,hoping that`s the problem(finger`s crossed) Link to comment Share on other sites More sharing options...
nicmk1est Posted May 2, 2012 Author Share Posted May 2, 2012 got new manifold gasket today and problem is sort`d,,,what a differance,progressive power,easy to set up and tuning easier 8) goes like stink now,,happy days are back again,with the new copper headgasket changed and cleaning cylinder head and top`s of piston`s have made huge difference 8) 8) 8) Link to comment Share on other sites More sharing options...
nicmk1est Posted May 6, 2012 Author Share Posted May 6, 2012 its back!!!! only rev`s upto 26-2800rpm and then flutters and low power,changed the intake manifold gasket and re-align the needles,,,,any ideas? Link to comment Share on other sites More sharing options...
nicmk1est Posted May 7, 2012 Author Share Posted May 7, 2012 i think ive solved it!,,,front carb mixture screw O-ring(small),,,when engine running petrol seep`s out but very hard to see,cos of evaporation,just change the mixture housing and screw with new O-ring,,car rev`s past 3000 rpm now,,,fingers crossed that was the problemseams it was sucking in air thru the mixture screw causing air build up in the float bowl stopping fuel going thru to needle and holding back the fuel,,,not been on test drive as yet,,,cup-o-tea time Link to comment Share on other sites More sharing options...
nicmk1est Posted May 7, 2012 Author Share Posted May 7, 2012 its better but still got mis-fire underload :( Link to comment Share on other sites More sharing options...
nicmk1est Posted May 7, 2012 Author Share Posted May 7, 2012 i cant help thinking that ive blown a ring somewhere between 1 and 3 piston,,,seeing the problem is front carb,,am i in the right area of thinking? Link to comment Share on other sites More sharing options...
nicmk1est Posted May 8, 2012 Author Share Posted May 8, 2012 well,bit of a downer day,,,done a comp test,,,and the figures i got is poo :(1--50psi2--25psi3--15psi4--45psi5--40-45psi6--45-50psilooks like compression ring are gone :'( what a said day Link to comment Share on other sites More sharing options...
thescrapman Posted May 8, 2012 Share Posted May 8, 2012 Was that all plugs and and wide open throttle?I don't think it would have run with compressions that low.CheersColin Link to comment Share on other sites More sharing options...
nicmk1est Posted May 8, 2012 Author Share Posted May 8, 2012 thescrapman wrote:Was that all plugs and and wide open throttleyes,plugs out-butterflys full open,coil dis-connected,fuel line block`d off,even did the comp check twice,,that is the only thing it can be now,did the normal checks first and new parts fitted,still runs the same-bogs under load but idle sort of ok Link to comment Share on other sites More sharing options...
Pom Down Under Posted May 9, 2012 Share Posted May 9, 2012 I hate to admit it but one of my "spare" Mk 1 sedans runs compressions from a best cylinder of 60 psi, down to 15 psi and one with nothing registering at all! :DDespite that, when used, it ran reasonably well - stuffed if I know how but it did AND could never have been accused of holding up the traffic. Perhaps I might get around to pulling the head off one day and checking out the condition of the valves ( is the country in recession or just my valves? ). :-/You have to love the way Triumphs continue to run despite the lack of attention they might receive. :B Link to comment Share on other sites More sharing options...
nicmk1est Posted May 9, 2012 Author Share Posted May 9, 2012 im pretty sure now its the rings,,,when i toke the head off to do a headgasket change,top of pistons where cover in black hard crap(i do have pictures) the front 3 cylinder were worse but same across all 6 pots,,when i cleaned the head all valve were seat properly,,,with recession in valve,i thought it was slow loss of power of a period of time not sudden power loss is what i had Link to comment Share on other sites More sharing options...
Paul64 Posted May 10, 2012 Share Posted May 10, 2012 A useful check is the leak-down test - use a pipe from a compression tester or ram a rubber pipe into the spark plug hole and apply a low air pressure with the valves closed on that cylinder.If you get air coming out of the inlet or exhaust, that's the problem, if you have air coming out of the oil filler cap, the liner / rings are to worn or broken.......Paul Link to comment Share on other sites More sharing options...
nicmk1est Posted May 10, 2012 Author Share Posted May 10, 2012 hi paul,,,i may have to check that before striping(no jokes please),cheers Link to comment Share on other sites More sharing options...
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