One lung FM Z 1 1/2 HP

[Geo46]

One problem with the cultivator carb, it has a primer bulb which may be a problem to retofit , tank is a 1 gal mounted on the top, rather not have primer if possble, another problem I just incountered is that the engine was submersed in seawater during Ina, not sure what the results are at point, these engines are pretty tuff, I will still need a carb.

[fidlstyks]

Did you find a carb, they are common here in US, where are you? There is always one on eBay for sale, I am sure I have one extra.

[Geo46]

Hi All, I am beginning to think that we should try and find an after market Flo Jet That is mounted the same way as the problem child, throttle linkage could remain the same, hopefully, any suggestions?
Thanks

[Geo46]

Hi All, I have installed a GX160 carburetor, modified a manifold, not getting fuel into the cylinder, however I placed a small piece of gas soaked paper into the throat of the carb and turned it over and I got a couple of pops, thinking of increasing the size of the main jet, any suggestions?
Thanks

[Admiral_dk]

I'm pretty sure that the cultivator carb isn't working as it needs to be connected to the Crankcase for the pumping action (a small hole not far from the Venturi) ....

As for the Honda Carburator - first check that it gets fuel to the Float Chamber etc.

A good guide (from Honda) can be found here : https://www.honda-engines-eu.com/files/files/carb-check-gx120-390-gxv140-390-en.pdf

Hope that you get it running. Oh - and please try with a brand new Spark Plug too (I haven't got a number for how many times I've been had, by seeing a nice spark outside the Engine, but no inside).

Per 

[gipetto]

there could be vacuum leaks between the carb and the engine. ensure that you are using good gaskets, even if homemade at every joint. it's ok to use some easy start to see if it will fire. first check to see that compression on the engine is good. it can be much easier to start an engine with an electric drill, maybe in your case it's too large to do so. you might need to choke the carb also.

it would be better if you could see the carb running on a gx160 so that you know it is good.

[Geo46]

Hi, from my calculations it appears that it engine about 58 ci,  17 CFM and the suitable carb would be  7.3 CFM , where would I find a carb that size?
Cheers!

[Geo46]

I have compression, sealed all around manifold, it will pop when I spray starter fluid, not getting gas from carb, will try changing main jet.
Thanks

[Geo46]

Hi All, after further investigation, the cyclinder bore is 4” stroke is 4” and the RPM’s are 500.
Can someone check my figures it seems I come up with 800 + cc’s.

Thanks

[gipetto]

wolfram alpha says the volume of a cylinder of 4" diameter by 4" length is 6.28 cubic inches or 103cc

[Vixen]

wolfram alpha says the volume of a cylinder of 4" diameter by 4" length is 6.28 cubic inches or 103cc

Who or what is wolfram alpha?

Pi * r squared * h     says the volume is 50.272 cu inch or 823.81 cubic centimetres

[crueby]

wolfram alpha says the volume of a cylinder of 4" diameter by 4" length is 6.28 cubic inches or 103cc

My math comes up with 50.266544 cubic inches, 828.63417757 cc's. Your answer of 6.28 is way too small for a 4" bore. You forgot to square the radius, and then multiply by pi, and then the length of the stroke. 

[Kim]

I'm not an IC guy, but isn't the volume of a cylinder calculated (Pi) * R^2 * H?  So if the R is 2", and the H is 4", I get

3.1415 * 2^2 * 4 = 50.264 in^3

and 1 in^3 = (2.54cm)^3 = 16.38cm^3

So I'd come up with ~823cm^3

Is it somehow different for engines?
Kim
 
----------------------------
Oops - my post overlapped with Chris's AND Mikes.  And I think their answers are right.

[gipetto]

wolfram alpha says the volume of a cylinder of 4" diameter by 4" length is 6.28 cubic inches or 103cc

Who or what is wolfram alpha?

Pi * r squared * h     says the volume is 50.272 cu inch or 823.81 cubic centimetres

It's a free AI tool for math, came out about a decade before chatgpt. wolframalpha.com. it has worked in the past for me, but i guess it's become abandoned and the results are not as good.

[Geo46]

Hi All, based on the conversion charts that I just used ,and probably should have before I asked the question, it works out to be 50 cui +/- and 819  cci +/- , so assuming that it is 50 cui. what should I consider for a carb?
Thanks