dellorto,s to pump or not

M

merlin

Senior member
Location
gunnislake cornwall
went out on my mirage today for the fist ride a bit disappointed ,it seems to bog down at low revs when I got it the pumps had been removed from the carbs will they make a lot of difference. I do have the parts to replace them, all the jets and needles have been replaced  .new ignition system fitted as well thanks for any advice
dave 
 
ere we go ere we go ere we go,
ere we go ere we go ere wego oooh
ere we go ere we go ere we go, ere wego oh ere we go
camp A) remove pumps and carry on regardless, all problems are solveable
camp b) retain  pumps and carry on regardless all problems are solveable

CLEM
wh was it who quoted, 90% of carburation problem are ignition related
 
well thats really helped ,may as well just keep riding it as it is then !!!  .this is the problem when you are new to these bikes the knowledge is out there but I cant find it
dave
 
Re connect the pumps Dave and get the carburation set up as per the manual. I generaly back the pump delivery off a bit but the pumps are necesary to ensure clean throttle response. That is why they were fitted in the first place..


    Keith
 
Agree with Keith, you are describing the exact issue the pumps were meant to address, off idle lean running due to slider being raised. True, you could experiment with different needle profiles and positions that may make the condition better even without the pumps, but all the bikes I had that had dellortos ran best at near stock settings (unless exhaust or other changes require rejetting) with the pumpers functioning.....I predict there will be 40 more postings disagreeing, and another 40 that will swear by the pumpers, so I would experiment on your own and find out what works best for you, rather than listen to me, Keith, Clem, your dentist, Shaman, rabbi, priest, vicar, accountant or lawyer.......especially not the lawyer.....
 
I am actually in both camps,

TOG runs fine without them, and then there is one less maintenance item to worry about, there are probably dozens of riders out there who have blocked pump jets,and dont even know it, and even more who might have one or two of them working, but not all three, and again, many will never notice, but of course some will.

I also like riding bikes that have got them fitted, and I would have to say that low end grunt will likely as not be good.

None of you will like this but I have tried and failed to  make a single carb manifold for TOG on two occassions, now that Tom (son #1) has bought an expensive TIG, and I have to pay for the argon (since he does not have a BOC account) he can weld me up a third attempt, anyone got a 49mm carb from a honda VTR1000?
CLEM
 
Hey Grant, I've thought about doing an LPG dual fuel conversion on my Kawasaki sidecar outfit. Plenty of room to carry the gas bottle on the sidecar chassis. The only thing stopping me is the $2k worth of hardware to do it.

Cheers,
Cam
 
I must have done this post a dozen times.I pulled the pump cam out of the Delordo on my 350 4stroke Husky dirtbike hoping for a lighter more precise throttle action,I achieved that but the bike was virtually unusable as a Dirtbike,wack the then very light throttle open and it would fall on its face.Open it dead slow and it was kinda OK.So you can ride around the lack of pumps but don't expect any fun type hard acceleration.So why would you disable the gadget that supply's all the fun.
 
You must log in or register to reply here.
Back
Top