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#1 MikeJE

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Posted 16 May 2020 - 07:05 PM

I have a rebuilt 998 engine with 1275 head and twin HS2s. Whatever adjustments I try on the carbs the engine will either not tick over at all or ticks over at 1300-1400 rpm initially but slowly, very slowly, the revs drop to about 800 rpm. I have checked for airleaks around the manifold and I have serviced both carbs. I have also made sure the carb pistons move freely.

 

The wisdom of the forum with thoughts on a solution would be very much appreciated.

 

I do hope everyone is keeping safe at this difficult time

 

Best wishes

 

Mike



#2 MiniMadRacer

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Posted 17 May 2020 - 09:34 PM

When you say initially runs at 13 to 1400 revs, is this from cold when you pull the choke out...if so.. when you push the choke back in maybe both jets are not returning properly... have a look at the choke mechanisms to start with



#3 MikeJE

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Posted 19 May 2020 - 04:05 PM

Thanks MMR - but this is when hot. The choke is in (and I checked the cables and connectors). So if I am coasting in neutral up to traffic lights the revs are around 1400, then slowly reduce to about 800, but very slowly - perhaps over about a minute. All the carb bits move freely and there is nothing sticking on the throttle cable side, so I am baffled!

 

Best wishes

 

Mike



#4 MiniMadRacer

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Posted 19 May 2020 - 08:33 PM

If it doesnt happen cold, check for fuel vapourisation in the fuel pipe.. is it running too close to the exhaust manifold by any chance ?



#5 MiddletoM

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Posted 19 May 2020 - 09:01 PM

you checked the timing?



#6 MikeJE

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Posted 25 May 2020 - 02:42 PM

Many thanks, all these things now checked. And carbs cleaned and manifold nuts checked, but still she won't tick over until about a minute or so has passed. Any further thoughts welcome...

 

Best wishes, and stay safe, all...

 

Mike



#7 Quinlan minor

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Posted 25 May 2020 - 03:25 PM

Try a new throttle cable.



#8 DB1380

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Posted Today, 03:11 PM

Did you Balance the Carbs when you put them back on after cleaning ?

 

Dicky.






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