why does it blow then go quiet?

[sharky71]

No not the other half or some fluusey i met in the pub........

When i start my engine from cold all is fine but when i blip the throttle it sounds louder almost like it is blowing but when it is warm i.e. choke is off and then i blip the throttle all is quiet well if you can have a quiet aircooled.

Running a standard 16tp with stock carb oil bath airfilter and standard zorst.
When i removed engine last winter checked all fixings were tight and recently like 6 weeks ago pulled engine to refurb the Dynamo and checked again all was tight so what is the loud noise which goes away??
Should i investigate further or let sleeping dogs lay??

The zorst is about 3k miles old and van is kept in garage not that that has anything to do with it :lol: :lol:

Answers on a postcard to ..............

Regards.

Sharky.


:sick0019:

 

[jonboylaw]

Ae you blipping it when cold in the garage and when warm out of the garage ?


Sent from my GX64 SatCom phone using Tapatalk

 

[sharky71]

Blipped both times in the garage,once when cold and then after choke off,setting the 34pict carb.

 

[sharky71]

well it is still doing it but tonight i had a good look,had to take off the bumper and remove the rear valance then started the engine and it seemed to come from the offside exchanger to zorst joint.
so i tightened that joint good and tight then started the engine again,bugger me it only kept blowing so i assumed it was loose at the cylinder head/zorst so i then took off the rear tinware and all the pipe work :roll: and had a look at the nuts and they are real tight so i started the van yet again and that's when i saw a puff of smoke from the joint where the preheat pipe leaves the silencer :? :?

is this common for a standard zorst to blow there??

it's at such awkward spot i cannot see for sure but it was not from the head or the xchanger joint so either the preheat joint or there must be a split in the zorst.
annoying really,the zorst has only done about 2k miles max but is 4yrs old and the van is in the garage all year round.

 

[StuF]

If it is the exhaust its a good excuse to furnish your bus with a nice new VS model!
Mine will probably last longer than I will!