1988 rebuild update

[oldman]

Have ordered the bar ends, spare time today so thought I would check and take for mot, difficult to start again! Checked all usual suspects and thought fuel starvation to blame, could get to start on choke but running off choke poor, decided to take carb out and found inlet rubber split below jubilee clip! Ordered from cmsl as fowlers had no stock,none on eBay either! 60 odd euros including postage, not pleased. To be expected for 29 yr old rubber parts I suppose, assume it split after initial reassembly as started and ran perfectly when first reassembled. At least I found the problem, just have to wait a week or so for delivery now

[Calum]

@oldman It's just good we can still get them. Won't be long before they're discontinued.

[Nottsbiker]

Only the ones with the additional intake silencer attachment will be left before long

[oldman]

@calum said in 1988 rebuild update:

@oldman It's just good we can still get them. Won't be long before they're discontinued.

Maybe I should buy another, still have the 89.to do

[oldman]

@nottsbiker said in 1988 rebuild update:

Only the ones with the additional intake silencer attachment will be left before long

Which one is that?

[Nottsbiker]

Like those fitted to late DTR / DT-X etc had a hole for another yeis type bottle to plug in and act I'm guessing as an intake silencer

[oldman]

@nottsbiker looked on cmsl exploded diagrams, can only see the pattern as mine even for later bikes, same part no? May seal mine with self amalgamating tape while I am waiting, (I get bored easily!)

[Nottsbiker]

Least it's not downstream of the carb so you won't do as much damage if it's not 100% sealed.

[oldman]

It is downstream of the carb, air drawn in rather than through carb hence starting difficulties, just as well found now, could have been much worse if I was caning it around, will try and post a pic hortly

[oldman]

There you go! How did I miss that!

[Calum]

@nottsbiker It's not a silencer. It's Yamaha Energy Intake System and is used to as a resonance boost bottle.

I've explained it before, but probably poorly. Definitely research it.

[Nottsbiker]

Jesus! How did your guide dog get that carb in there and miss that massive split

[Nottsbiker]

@calum said in 1988 rebuild update:

@nottsbiker It's not a silencer. It's Yamaha Energy Intake System and is used to as a resonance boost bottle.

I've explained it before, but probably poorly. Definitely research it.

I know what the YEIS does but I'm unsure if the second 'bottle' is a boost bottle and always assumed it was a modification by Yamaha to the older engine to either quieten it down more or improve emissions.

[Calum]

@nottsbiker As @AndyYam used to say, the competition WR had those same bottles. They wouldn't restrict a competition bike.

[oldman]

Split was not there when reassembled, ran fine at the time, been a few weeks since then waiting for wheels to be done, just old rubber I guess, could have gone anytime

[Nottsbiker]

@calum said in 1988 rebuild update:

@nottsbiker As @AndyYam used to say, the competition WR had those same bottles. They wouldn't restrict a competition bike.

Just had to Google that to check and you are correct

[oldman]

Had a look for the tdr exploded diagrams on csml, intake looks the same but different part nos, bad news is that one is €65 exc postage

[oldman]

Still can't see a second bottle though. Only the normal bottle?

[Nottsbiker]

Yes I thought that might be the case due to having the dellorto rather than the mikuni carb.

If i could find a 200R engine I'd use the associated carb which I reckon is the same 28mm mikuni as the DTR

[Darty]

@calum Not 100%, Yamaha restriced the intake volume on the WR200 for ridabilty,

It was never intended for competition, it's a trail bike. Hence their effort to smooth out intake pulses at low RPM with YIES.