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400/4 Engine noise, bodges and Primary chain

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Fourplay:

--- Quote from: Nurse Julie on June 16, 2021, 08:10:27 AM ---Those drilling marks where the filer sits are standard, we all have them to a greater or lesser degree on our engines. There are quite a few in various places all over the engine, so nothing to worry about.
There is alway a bit of side play on the primary chain and as for the engine noise, I would start with giving the carbs a thorough strip and clean, fit new Viton O rings, bench sync and then vaccum sync. How many miles has that engine done?

--- End quote ---

Hello Julie. I bought the bike in April with 39,000 miles 10,000 done in the last 30 years. (have MOTs back to 1991 and receipts for work/parts back to 2006). New pistons fitted in 2006 at 36,000 miles. Receipts for dealer servicing/new parts.

Came with carb rebuild sets, so I know the carbs need sorting. Was putting this off until I was happy that the cam chain/primary chain were okay. But I guess the uneven running at idle may be contributing to the rattle and primary chain slap.

Never owned a four before so much of this new to me.

So as advised I think I will remove the carbs, and try and reuse as much of the original jets etc as possible.

I'll be in touch about the Viton O rings once I've stripped the carbs as I see you sell the Carb screw sets as well ,

Thanks for your help.

Justin

McCabe-Thiele (Ted):
Listening to your noise it does have that sort of uneven running tone to it so Julies far more experienced answer looks very  sound to me.

I would also be checking the timing is spot on for both sets of points - gap/dwell.

Nurse Julie:
OK Justin. I know removing and stripping the carbs and syncing is a bit of  faffing around but, at least it will either rule out, or not, any engine issues there may be.

K2-K6:
"But what is this all about? Looks like someone has attacked the filter housing with a drill?"

As already indicated above they are present in various places and would seem to be there to facilitate machine clearance for critical machining during manufacturing.

McCabe-Thiele (Ted):

--- Quote from: K2-K6 on June 16, 2021, 09:22:35 AM ---"But what is this all about? Looks like someone has attacked the filter housing with a drill?"

As already indicated above they are present in various places and would seem to be there to facilitate machine clearance for critical machining during manufacturing.

--- End quote ---

If it was a flywheel they would be balancing marks, it's probably something odd like where a robot style machine holds it whilst they stamp the casing marks on the other side during production?

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