1981 IT175 Repower?

Highside>Lowside · 07-19-2012, 09:01 PM

Okay, I used to race HS way WAY back when, and I picked up a cheap basket to relive old times. I'm going to go through the motor, but in the interim, do the later right drive IT175 and 200 engines swap into this frame relatively easy? Because I see good running cheap examples all over the place. Would be an easy way to get this thing running this summer.

TIA

Shocktower · 07-20-2012, 08:01 AM

What is easy

Highside>Lowside · 07-20-2012, 09:24 AM

NO major changes to the exhaust or frame.

Sniper X · 07-20-2012, 01:38 PM

dunno but sure did love the IT175! one of the greatest bikes Yamaha ever made.

Highside>Lowside · 07-20-2012, 01:48 PM

Yeah, I loved the little bugger. Trying to get this one going to relive some of that.

stainlesscycle · 07-24-2012, 07:47 PM

you're better off starting with a it200. they're dirt cheap, and the suspension, power delivery, and handling is light years ahead of the 81 it175.

Highside>Lowside · 07-25-2012, 04:07 AM

But I didn't start racing Hare Scrambles on an IT200. I raced the Little White Knight...

Hot Stuff · 07-25-2012, 04:43 AM

Best of luck to you, sorry I can't help with any information. That's an IT 200 in my avatar.

stainlesscycle · 07-25-2012, 06:39 AM

on the it175 the suspension is it's biggest weak point. swap in a set of yz forks/triples and check spring rate - all it175's are spring too soft unless you weigh 145lbs - and original springs are pretty beat up after 30 years..... change rear spring for a stiffer one. rebuild rear shock while you're at it (i can't remember if it175 81 is rebuildable, the earliest ones were not. but i assume it is). also check specs on the fork tube height in the triple trees - many set them back to even with the top, when they really should be at 50mm sticking out top (might be different for 1981 - i only know the j/k models)) the motor is what it is, runs good mid/top, not bad low grunt, but nothing like the it200, so maybe figure a flywheel weight, or work on squish/porting. the it175 motor shifts better than the it200, i'll give it that for sure.

Highside>Lowside · 07-25-2012, 12:19 PM

What I would really like to know is whether I can swap a later right drive 175 or 200 into my 81. How similar are the mounts?

07-19-2012, 09:01 PM	#1
Highside>Lowside ^OP Hairier Than Thou Joined: Mar 2010 Location: ChiTown Oddometer: 821	1981 IT175 Repower? Okay, I used to race HS way WAY back when, and I picked up a cheap basket to relive old times. I'm going to go through the motor, but in the interim, do the later right drive IT175 and 200 engines swap into this frame relatively easy? Because I see good running cheap examples all over the place. Would be an easy way to get this thing running this summer. TIA __________________ 1977 TT500- Old's Cool. 1995 620 RXC- Make my Kool Aid Grape, please. 1982 FT500- Moar Thumper 2000 M900- My new Italian Lover Now with more Honda Sabrey GoodNess (IBA SS1000 Approved)

07-20-2012, 08:01 AM	#2
Shocktower Beastly Adventurer Joined: Jul 2009 Location: Oregon City Orygun Oddometer: 8,220	What is easy __________________ Alexa Drew Nov 9 1995- Oct 28th 2004 Miss you baby '08 KTM 530 EXC 79 RD 400 Daytona

07-20-2012, 09:24 AM	#3
Highside>Lowside ^OP Hairier Than Thou Joined: Mar 2010 Location: ChiTown Oddometer: 821	Easy NO major changes to the exhaust or frame. __________________ 1977 TT500- Old's Cool. 1995 620 RXC- Make my Kool Aid Grape, please. 1982 FT500- Moar Thumper 2000 M900- My new Italian Lover Now with more Honda Sabrey GoodNess (IBA SS1000 Approved)

07-20-2012, 01:38 PM	#4
Sniper X De Oppresso Liber Joined: Jul 2006 Location: Central New Mexico, 7420ft above sea level Oddometer: 30,297	dunno but sure did love the IT175! one of the greatest bikes Yamaha ever made. __________________ "I claim to be frightened of horses but do so only to get out of attending parades. It's peculiar but ...it works. The Horses get it. RESISTANCE IS NOT FUTILE. IT'S VOLTAGE DIVIDED BY CURRENT

07-20-2012, 01:48 PM	#5
Highside>Lowside ^OP Hairier Than Thou Joined: Mar 2010 Location: ChiTown Oddometer: 821	Yeah, I loved the little bugger. Trying to get this one going to relive some of that. __________________ 1977 TT500- Old's Cool. 1995 620 RXC- Make my Kool Aid Grape, please. 1982 FT500- Moar Thumper 2000 M900- My new Italian Lover Now with more Honda Sabrey GoodNess (IBA SS1000 Approved)

07-24-2012, 07:47 PM	#6
stainlesscycle Beastly Adventurer Joined: Jun 2008 Location: morgantown, wv Oddometer: 1,639	you're better off starting with a it200. they're dirt cheap, and the suspension, power delivery, and handling is light years ahead of the 81 it175. __________________ current bikes 07 gasgas xc300-94 duc 900ss-86 morini camel (2)-84 IT200-83 IT175-78 guzzi lm1-77 pursang 250-76 morini 3 1/2 strada-76 frankentaco pursang 200-74 frankentaco pursang 200-74 morini 3 1/2 sport-74 mz ts250/0-74 puch 175 (3)-73 can-am 175tnt-71 guzzi frankeneldo-71 ossa Stiletto-70 frankentaco sherpa s(2)-66 morini corsarino(2)-63 morini corsaro + many more

07-25-2012, 04:07 AM	#7
Highside>Lowside ^OP Hairier Than Thou Joined: Mar 2010 Location: ChiTown Oddometer: 821	But I didn't start racing Hare Scrambles on an IT200. I raced the Little White Knight... __________________ 1977 TT500- Old's Cool. 1995 620 RXC- Make my Kool Aid Grape, please. 1982 FT500- Moar Thumper 2000 M900- My new Italian Lover Now with more Honda Sabrey GoodNess (IBA SS1000 Approved)

07-25-2012, 04:43 AM	#8
Hot Stuff Road Dragon Joined: Dec 2009 Location: The Land of Morning Calm Oddometer: 191	Best of luck to you, sorry I can't help with any information. That's an IT 200 in my avatar.

07-25-2012, 06:39 AM	#9
stainlesscycle Beastly Adventurer Joined: Jun 2008 Location: morgantown, wv Oddometer: 1,639	on the it175 the suspension is it's biggest weak point. swap in a set of yz forks/triples and check spring rate - all it175's are spring too soft unless you weigh 145lbs - and original springs are pretty beat up after 30 years..... change rear spring for a stiffer one. rebuild rear shock while you're at it (i can't remember if it175 81 is rebuildable, the earliest ones were not. but i assume it is). also check specs on the fork tube height in the triple trees - many set them back to even with the top, when they really should be at 50mm sticking out top (might be different for 1981 - i only know the j/k models)) the motor is what it is, runs good mid/top, not bad low grunt, but nothing like the it200, so maybe figure a flywheel weight, or work on squish/porting. the it175 motor shifts better than the it200, i'll give it that for sure. __________________ current bikes 07 gasgas xc300-94 duc 900ss-86 morini camel (2)-84 IT200-83 IT175-78 guzzi lm1-77 pursang 250-76 morini 3 1/2 strada-76 frankentaco pursang 200-74 frankentaco pursang 200-74 morini 3 1/2 sport-74 mz ts250/0-74 puch 175 (3)-73 can-am 175tnt-71 guzzi frankeneldo-71 ossa Stiletto-70 frankentaco sherpa s(2)-66 morini corsarino(2)-63 morini corsaro + many more

07-25-2012, 12:19 PM	#10
Highside>Lowside ^OP Hairier Than Thou Joined: Mar 2010 Location: ChiTown Oddometer: 821	What I would really like to know is whether I can swap a later right drive 175 or 200 into my 81. How similar are the mounts? __________________ 1977 TT500- Old's Cool. 1995 620 RXC- Make my Kool Aid Grape, please. 1982 FT500- Moar Thumper 2000 M900- My new Italian Lover Now with more Honda Sabrey GoodNess (IBA SS1000 Approved)

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