I am running a 2276 that was set up for Drag Racing. It was 12:1 compression and it ran great, it has a single 48 Dellorto, 009 dis with petronix, 044 heads, VZ35 Cam. I reduced the compression to 9.5:1 so I wouldn't have to run airplane fuel and now it doesn't rev good. It sounds like it has a rev limiter all the way through the rpms. It doesn't really run good unless you hold it flat out on the floor. IT does idle decent and doesn't have any off idle hesitations.

My question is, now that the compression is changed do I need to re jet the carb, or what would I need to do if anything. I pulled the idle jets and one was a 50mm and the other a 55mm. I can check the main jets if need be. Just trying to get it straightened out before I go for a ride. Let me know what you guys think it is and where I should start. Thanks Donnie

That cam is going to be way to big for a bottom end woods buggy.IMO You will have to rev it up to get any power out of it.

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IF YOU CAN'T MAKE IT IN A LITTLE BUGGY,IT CAN'T BE CLIMBED

I agree with Mike. I have a buddy who is going thru the same thing, same cam. It wont pull low rpm's worth a crap, although it lights up when he gets into it, but then it just blows the tires and it makes it pretty tough to climb with.
As far as rejetting, talk to Roy, I think he's got a pretty good handle on single-center mount carbs.
Those big ol' cams work even worse when you dont run them with high compression, too. Split 'er open and throw a 110 in it, you'll have gobs of bottom end!

Larry

I'll agree with the 110, I run one in my 2332 with dual 36 Dell's. It's no top secret KY motor, but seems to do well for me.

My 2 pennies.

-Blake

I know the cam is too big for trail riding but I am not gonna split the engine until this winter so I was hoping to get it dialed in for now so I can ride. Roy, if you see this post, let me know what jets you think I should go with, or if thats even the problem...thanks for all the info guys!!

What is the engine acting like? Does it seem like it is starving for fuel or do you think is wants more fuel? Any popping when it acts like it's on a rev-limiter? This would mean you need to fatten up the mixture some. List the jets sizes you have in it now.....

The two main jets say GMCI 1.90 MM
One idle jet is 50mm other is a 55mm



2276 82mm bergman
94mm mahle piston
VZ35 Cam
044 heads
single 48 dellorto
009 dis with petronix

Motor idles good but doesn't acclerate right, acts to me like maybe too much fuel. No "popping", just kind of sounds like one sounds that is running on 3 cylinders...with the big cam it makes it hard to drive becuase its all or nothing......any help appreciated, thanks Donnie

The only way to get it perfect might be some old fashon trial and error.

Does anyone know anything here about Dellortos? Why would it have 2 different size idle jets, is this normal? Just trying to get this done so I can go riding Labor Day weekend........... Please, any help appreciated....thanks Donnie

i ran a 45 on my 2186 and ure ilde jetts sould be the same that is the first thing i would fix

They might be drilled out the same,even if they are stamped differant.

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IF YOU CAN'T MAKE IT IN A LITTLE BUGGY,IT CAN'T BE CLIMBED

yes but drilled jets are never as accurate than factory made

Thanks for all the advice......I think I am just gonna have to tear it back down and change the cam and start from there.......Does anyone know if those main jets are too big or not? I guess I am gonna stick a good ole Engle 110 cam in it. I have a nice VZ 25 but not for sure what that is compared to the 110.

Donnie

Last nite we were messing with my buddy's old two-seater, trying to get it ready for my son to drive Labor Day. Its a single Weber 48 on a 1915 w' a VZ15(I think) and 041 heads, 3-rib, 31" diggers. We had messed w/ the jetting back when this buggy was my buddy's only buggy, but I couldnt remember the jetting. Its been sitting a year or so, so we semi-disassembled the carb to clean it up. Its got 190 mains and 60 idles, 36mm venturiis. It idles and lugs around just fine, runs good at top end, but has a little bit of a dead spot when going from idle to main circuit. Seems like at about 2000 rpm. Nothing bad, just pedal it once and it wakes right up.
I wouldnt think that your mains are too big, being 190's, and having so much more motor than what I'm dealing with. Plus, I've always heard that you can run a little bigger jet in a Del than you can a similiar sized Weber on the same engine. I would think yours needs bigger jets. This motor did the same "dead cylinder act" when you'd rev it before we reamed the mains, but it DID pop like it was too lean, which you said yours DOESN'T. Get a jet reamer kit. You wont regret it. Handy as hell.
It'll never be great with big cam, so I'd say you're on the right track by tearing it down and changing it. Good luck!

Larry