Mikuni for GT

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What would be the best Mikuni flat slide for a 32mm ported 1974 GT head ?

Also any suggested jet sizes ?

Cheers,

Rob
 
What would be the best Mikuni flat slide for a 32mm ported 1974 GT head ?

Also any suggested jet sizes ?

I fitted a pair of 32mm PHF Dell's to an early Sf - with 40mm inlet valves and std size exhaust - I used triple inlet stubs with inlet blended to suit. For any carbs you fit - I would suggest using jet sizes equivalent to std VHB ones used as a start. - Regards - Phil
 
Thanks for the responses.

Yes it is for a GT, otherwise standard except for a disc front end.

The Dellorto VHBs are going to join the Amal from my Matchless G80CS ... somewhere down the back of the garden !

Interestingly, I also have an almost new 1969 head with 28mm inlet ports but it supposedly came off an American Eagle S model ? I haven't clocked the cam to see whether it is an S or GT. It seems to nice to mess with.
 
The small port heads are great to "mess with" - I reduced port to inlet valve angle by 10? and fitted 36mm carbs to one of mine. - Regards - Phil
 

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ay Rob,  for a GT, i'd suggest ya stay with the round slides? plenty of good ones out there.
flat slides farken 'rattle' (well, the Mikuni RS series do),  reckon a GT needs to be a bit more pleasant?

decades ago, fitted some Mikuni round slides to me T140V Bonnie.  nice.
cheers,  Mark
 
No - I used triple inlet stubs mounted horizontally - filled in original threads with aluminium studding and milled face to suit - Regards - Phil
 
markQLD said:
decades ago, fitted some Mikuni round slides to me T140V Bonnie.  nice.
cheers,  Mark
Click to expand...

Me too, except mine was a T120. The carbs were off a Suzuki 500 Titan. After farting around with jets, I arrived back at the exact same settings as the carbs had on the Suzuki, which was a little surprising considering the differences between the two engines. The Bonnie started, idled and ran much better right through the throttle range.

The bloke who I eventually sold it to reckoned it wasn't right to have Japanese carbs on a British bike, so he put the worn-out old Amals back on. He had the bike coughing, spluttering and stalling and generally running like a heap of crap. What a dickhead.
 
I fitted the 32mm Del's of a mates 860 Bevel to my 1964 T120 after he went to 40s.I was running real tall gearing and thought it went great,till it eat a rear wheel hub on a trip through the Snowys to Melbourne.I found and fitted a disc rear wheel with std rear sprocket and discovered it was very rich on the main.Had a nightmare trip home on the Hume expressway with it not pulling the mains.All the way at 80ks being passed by every truck very very close.It took 2 full days,mid 40c with hot westerly winds.Convinced me I needed something FASTER,bought my 3c a couple of weeks later.That was 1987 and have had it since.
 
also the Mikunis flat slides don't come in a right hand/left hand version so adjusting the idle/pilot is a bitch on one side - the mikuni VM's (which are great carbs) do come in righty/lefty and are an improvement over the typically worn dells

markQLD said:
ay Rob,  for a GT, i'd suggest ya stay with the round slides? plenty of good ones out there.
flat slides farken 'rattle' (well, the Mikuni RS series do),  reckon a GT needs to be a bit more pleasant?

decades ago, fitted some Mikuni round slides to me T140V Bonnie.  nice.
cheers,  Mark
Click to expand...
 
mik667 said:
also the Mikunis flat slides don't come in a right hand/left hand version so adjusting the idle/pilot is a bitch on one side - the mikuni VM's (which are great carbs) do come in righty/lefty and are an improvement over the typically worn dells
Click to expand...

take Keihins then (33mm), they have the idle screw at the bottom - no need for right and left side carbs...  ;)
 
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