Rd400 RD250 Lemon !!!

[bigal]

Hi guys

Think I have bought a lemon

I have a RD400 engine in a RD250 frame I bought the bike totally blind as it was in Cornwall the bikes got loads of history paint job £1,150 crank , Conrods seals all done but it’s been sat for 2 years in a garage not an issue but after today and doing some research I’m not sure .

I kicked it over last night but could not get a peep out of it so today I did a proper check
Nice fat juicy spark after put new plugs in but after no amount of kicking would it burst into life
I a triples man myself but always wanted an RD wow I thought triple carbs were bad RD carbs are a nightmare
It look like the carbs are 250 they were really gummed ip with old fuel but I stripped and cleaned them and put the back together what’s with the link pipes tiny piece of rubber between both carbs 😬 and the balancing pipe I think that’s what they call it 😜 anyway it started 3 rd kick but would not idle I managed to get some sort of idle the it cut out now down to 1 cylinder so swapped ht lead still same

Is there quicker way to take the carbs off and sort them !!

It took and age connecting everything up


Need some guidance from you experts out there

Cheers

From a very disgruntled Leeds guy

👍👍👍

[dusty350]

Hi
Did you use an ultrasonic to clean the carbs ?
Only way to do it properly. Muttsnuts is a carb guru - he will get them clean, and set them up too. He is in Malton.
Stick with it - it will be worth it

Dusty

[bigal]

Thanks for the quick reply Dusty

how much does he charge !

[dusty350]

Not sure, but it will be well worth it. Ultrasonic is the only way to properly clean dirty carbs - some of the drillings are very small and easily blocked with crud and varnish from old fuel. He can set your float heights too, so when they come back you just bolt them on, and hopefully, ride off into the sunset !!
You can pm him through the forum.

Dusty

[markhoopy]

Sept 15, 2018 21:08:13 GMT 1 bigal said:

Thanks for the quick reply Dusty

how much does he charge !

Send Dave a message here:
rdlccrazy.proboards.com/conversation/new/2289

Or contact him through his website here:

www.muttsnuts2strokes.co.uk/

[Deleted]

I would thoroughly recommend Dave. Obviously each job is different and demands it own price. But I think he is very reasonable and certainly will sort it for you.
Good luck.

[bigal]

Sept 16, 2018 0:48:26 GMT 1 markhoopy said:

Sept 15, 2018 21:08:13 GMT 1 bigal said:

Thanks for the quick reply Dusty

how much does he charge !

Send Dave a message here:
rdlccrazy.proboards.com/conversation/new/2289

Or contact him through his website here:

www.muttsnuts2strokes.co.uk/

Thanks everyone

I have got his mob number from his website and text him

[reevo]

You can buy your own ultrasonic bath.

[Deleted]

Just putting carbs in an US cleaner is not enough. You need to scrape and clean every drilling and get everything grime free. The US cleaner gets the final bits off and makes it look pretty, but you need to dismantle the carbs and put some hard work in 1st.

Once clean check the float heights, and it has the std jets and needles. Needle on the correct clip. Adjust the air screws correctly and try again. Clean the tank and fuel tap (filter) and pop some fresh fuel in.

Whilst you are at it drain the 2T tank, flush it and the oil pump with the 2T oil of your choice. Prime and start it up on premix, until the 2T oil is flowing from the carb feeds.

I'd be doing all that as a minimum and then you are sure it's all safe to use. It might not start but starting it with no oil will soon have a hefty engine bill

End of the day it's an old 2 Stroke, they aren't that complicated :-) Get the tools out and have a go, Oh and buy a manual

[Ozhammer]

Dave is currently working on the third set of carbs I have sent him and is worth every penny he charges imho.

[reedpete]

Sept 15, 2018 20:25:04 GMT 1 bigal said:

Hi guys

Think I have bought a lemon

I have a RD400 engine in a RD250 frame I bought the bike totally blind as it was in Cornwall the bikes got loads of history paint job £1,150 crank , Conrods seals all done but it’s been sat for 2 years in a garage not an issue but after today and doing some research I’m not sure .

I kicked it over last night but could not get a peep out of it so today I did a proper check
Nice fat juicy spark after put new plugs in but after no amount of kicking would it burst into life
I a triples man myself but always wanted an RD wow I thought triple carbs were bad RD carbs are a nightmare
It look like the carbs are 250 they were really gummed ip with old fuel but I stripped and cleaned them and put the back together what’s with the link pipes tiny piece of rubber between both carbs 😬 and the balancing pipe I think that’s what they call it 😜 anyway it started 3 rd kick but would not idle I managed to get some sort of idle the it cut out now down to 1 cylinder so swapped ht lead still same

Is there quicker way to take the carbs off and sort them !!

It took and age connecting everything up


Need some guidance from you experts out there

Cheers

From a very disgruntled Leeds guy

👍👍👍



If it’s really in the refusnic stage then it speeds things up by not connecting the air box link rubbers. There are things to check like the float bowls being in the correct side (choke side bowl is different to right side )and the slides in the correct way around, ( means choke side not in the righthand carb etc ) ...clean carbs but with the easy to make assembly errors will have you scratching your head...